Northern Sacramento Valley Groundwater Elevation Change Maps

### Fall 2021 Maps Only [Does not include Shallow Wells] Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change.

### Summer 2021 Maps Only Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change.

### Spring 2021 Maps Only Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change.

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. 2021-06-23 - Correction to the map 'C2004FI NSV Groundwater Elevation Change Map Fall 2004 to 2020 Intermediate Wells' layers that were not being displayed properly.

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2019 Deep Wells web.pdf * Change Map Fall 2004 to 2019 Intermediate Wells web.pdf * Change Map Fall 2004 to 2019 Shallow Wells web.pdf * Change Map Fall 2004 to 2019 100 to 450 Ft Wells web.pdf * Change Map Spring 2004 to 2019 Deep Wells web.pdf * Change Map Spring 2004 to 2019 Intermediate Wells web.pdf * Change Map Spring 2004 to 2019 Shallow Wells web.pdf * Change Map Spring 2004 to 2019 100 to 450 Ft Wells web.pdf * Change Map Fall 2011 to 2019 Deep Wells web.pdf * Change Map Fall 2011 to 2019 Intermediate Wells web.pdf * Change Map Fall 2011 to 2019 Shallow Wells web.pdf * Change Map Fall 2011 to 2019 100 to 450 Ft Wells web.pdf * Change Map Spring 2011 to 2019 Deep Wells web.pdf * Change Map Spring 2011 to 2019 Intermediate Wells web.pdf * Change Map Spring 2011 to 2019 Shallow Wells web.pdf * Change Map Spring 2011 to 2019 100 to 450 Ft Wells web.pdf * Change Map Fall 2015 to 2019 Deep Wells web.pdf * Change Map Fall 2015 to 2019 Intermediate Wells web.pdf * Change Map Fall 2015 to 2019 Shallow Wells web.pdf * Change Map Fall 2015 to 2019 100 to 450 Ft Wells web.pdf * Change Map Spring 2015 to 2019 Deep Wells web.pdf * Change Map Spring 2015 to 2019 Intermediate Wells web.pdf * Change Map Spring 2015 to 2019 Shallow Wells web.pdf * Change Map Spring 2015 to 2019 100 to 450 Ft Wells web.pdf * Change Map Fall 2018 to 2019 Deep Wells web.pdf * Change Map Fall 2018 to 2019 Intermediate Wells web.pdf * Change Map Fall 2018 to 2019 Spring Wells web.pdf * Change Map Fall 2018 to 2019 100 to 450 Ft Wells web.pdf * Change Map Spring 2018 to 2019 Deep Wells web.pdf * Change Map Spring 2018 to 2019 Intermediate Wells web.pdf * Change Map Spring 2018 to 2019 Shallow Wells web.pdf * Change Map Spring 2018 to 2019 100 to 450 Ft Wells web.pdf * Contour Map Spring 2019 100 to 450 Ft Wells web.pdf

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2018 Deep Wells web.pdf * Change Map Fall 2004 to 2018 Intermediate Wells web.pdf * Change Map Fall 2004 to 2018 Shallow Wells web.pdf * Change Map Fall 2004 to 2018 100 to 450 Ft Wells web.pdf * Change Map Spring 2004 to 2018 Deep Wells web.pdf * Change Map Spring 2004 to 2018 Intermediate Wells web.pdf * Change Map Spring 2004 to 2018 Shallow Wells web.pdf * Change Map Spring 2004 to 2018 100 to 450 Ft Wells web.pdf * Change Map Summer 2004 to 2018 Deep Wells web.pdf * Change Map Summer 2004 to 2018 100 to 450 Ft Wells web.pdf * Change Map Fall 2011 to 2018 Deep Wells web.pdf * Change Map Fall 2011 to 2018 Intermediate Wells web.pdf * Change Map Fall 2011 to 2018 Shallow Wells web.pdf * Change Map Fall 2011 to 2018 100 to 450 Ft Wells web.pdf * Change Map Spring 2011 to 2018 Deep Wells web.pdf * Change Map Spring 2011 to 2018 Intermediate Wells web.pdf * Change Map Spring 2011 to 2018 Shallow Wells web.pdf * Change Map Spring 2011 to 2018 100 to 450 Ft Wells web.pdf * Change Map Summer 2011 to 2018 Deep Wells web.pdf * Change Map Summer 2011 to 2018 100 to 450 Ft Wells web.pdf * Change Map Fall 2015 to 2018 Deep Wells web.pdf * Change Map Fall 2015 to 2018 Intermediate Wells web.pdf * Change Map Fall 2015 to 2018 Shallow Wells web.pdf * Change Map Fall 2015 to 2018 100 to 450 Ft Wells web.pdf * Change Map Spring 2015 to 2018 Deep Wells web.pdf * Change Map Spring 2015 to 2018 Intermediate Wells web.pdf * Change Map Spring 2015 to 2018 Shallow Wells web.pdf * Change Map Spring 2015 to 2018 100 to 450 Ft Wells web.pdf * Change Map Summer 2015 to 2018 Deep Wells web.pdf * Change Map Summer 2015 to 2018 100 to 450 Ft Wells web.pdf * Change Map Fall 2017 to 2018 Deep Wells web.pdf * Change Map Fall 2017 to 2018 Intermediate Wells web.pdf * Contour Map Spring 2018 100 to 450 Ft Wells web.pdf

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Spring 2004 to 2017 Deep Wells * Change Map Spring 2004 to 2017 Intermediate Wells * Change Map Spring 2004 to 2017 Shallow Wells * Change Map Spring 2004 to 2017 100 to 450 Ft Wells * Change Map Spring 2011 to 2017 Deep Wells * Change Map Spring 2011 to 2017 Intermediate Wells * Change Map Spring 2011 to 2017 Shallow Wells * Change Map Spring 2011 to 2017 100 to 450 Ft Wells * Change Map Spring 2016 to 2017 Deep Wells * Change Map Spring 2016 to 2017 Intermediate Wells * Change Map Spring 2016 to 2017 Shallow Wells * Change Map Spring 2016 to 2017 100 to 450 Ft Wells * Change Map Fall 2004 to 2017 Deep Wells * Change Map Fall 2004 to 2017 Intermediate Wells * Change Map Fall 2004 to 2017 Shallow Wells * Change Map Fall 2004 to 2017 100 to 150 Ft Wells * Change Map Summer 2004 to 2017 Deep Wells * Change Map Summer 2004 to 2017 Intermediate Wells * Change Map Summer 2004 to 2017 Shallow Wells * Change Map Summer 2004 to 2017 100 to 150 Ft Wells * Change Map Fall 2011 to 2017 Deep Wells * Change Map Fall 2011 to 2017 Intermediate Wells * Change Map Fall 2011 to 2017 Shallow Wells * Change Map Fall 2011 to 2017 100 to 150 Ft Wells * Change Map Summer 2011 to 2017 Deep Wells * Change Map Summer 2011 to 2017 Intermediate Wells * Change Map Summer 2011 to 2017 Shallow Wells * Change Map Summer 2011 to 2017 100 to 150 Ft Wells * Change Map Fall 2015 to 2017 Deep Wells * Change Map Fall 2015 to 2017 Intermediate Wells * Change Map Fall 2015 to 2017 Shallow Wells * Change Map Fall 2015 to 2017 100 to 150 Ft Wells * Change Map Fall 2016 to 2017 Deep Wells * Change Map Fall 2016 to 2017 Intermediate Wells * Change Map Fall 2016 to 2017 Shallow Wells * Change Map Fall 2016 to 2017 100 to 150 Ft Wells * Change Map Summer 2016 to 2017 Deep Wells * Change Map Summer 2016 to 2017 Intermediate Wells * Change Map Summer 2016 to 2017 Shallow Wells * Change Map Summer 2016 to 2017 100 to 150 Ft Wells * Contour Map Spring 2017 Intermediate Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2016 Deep Wells * Change Map Fall 2004 to 2016 Intermediate Wells * Change Map Fall 2004 to 2016 Shallow Wells * Change Map Fall 2004 to 2016 100 to 450 Ft Wells * Change Map Spring 2004 to 2016 Deep Wells * Change Map Spring 2004 to 2016 Intermediate Wells * Change Map Spring 2004 to 2016 Shallow Wells * Change Map Spring 2004 to 2016 100 to 450 Ft Wells * Change Map Summer 2004 to 2016 Deep Wells * Change Map Summer 2004 to 2016 Intermediate Wells * Change Map Summer 2004 to 2016 Shallow Wells * Change Map Summer 2004 to 2016 100 to 450 Ft Wells * Change Map Fall 2006 to 2016 100 to 450 Ft Wells * Change Map Fall 2011 to 2016 Deep Wells * Change Map Fall 2011 to 2016 Intermediate Wells * Change Map Fall 2011 to 2016 Shallow Wells * Change Map Fall 2011 to 2016 100 to 450 Ft Wells * Change Map Spring 2011 to 2016 Deep Wells * Change Map Spring 2011 to 2016 Intermediate Wells * Change Map Spring 2011 to 2016 Shallow Wells * Change Map Spring 2011 to 2016 100 to 450 Ft Wells * Change Map Summer 2011 to 2016 Deep Wells * Change Map Summer 2011 to 2016 Intermediate Wells * Change Map Summer 2011 to 2016 Shallow Wells * Change Map Summer 2011 to 2016 100 to 450 Ft Wells * Change Map Fall 2015 to 2016 Deep Wells * Change Map Fall 2015 to 2016 Intermediate Wells * Change Map Fall 2015 to 2016 Shallow Wells * Change Map Fall 2015 to 2016 100 to 450 Ft Wells * Change Map Spring 2015 to 2016 Deep Wells * Change Map Spring 2015 to 2016 Intermediate Wells * Change Map Spring 2015 to 2016 Shallow Wells * Change Map Spring 2015 to 2016 100 to 450 Ft Wells * Change Map Summer 2015 to 2016 Deep Wells * Change Map Summer 2015 to 2016 Intermediate Wells * Change Map Summer 2015 to 2016 Shallow Wells * Change Map Summer 2015 to 2016 100 to 450 Ft Wells * Contour Map Spring 2016 Deep Wells * Contour Map Spring 2016 Intermediate Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2015 Deep Wells * Change Map Fall 2004 to 2015 Intermediate Wells * Change Map Fall 2004 to 2015 Shallow Wells * Change Map Fall 2004 to 2015 100 to 450 Ft Wells * Change Map Spring 2004 to 2015 Deep Wells * Change Map Spring 2004 to 2015 Intermediate Wells * Change Map Spring 2004 to 2015 Shallow Wells * Change Map Spring 2004 to 2015 100 to 450 Ft Wells * Change Map Summer 2004 to 2015 Deep Wells * Change Map Summer 2004 to 2015 Intermediate Wells * Change Map Summer 2004 to 2015 Shallow Wells * Change Map Summer 2004 to 2015 100 to 450 Ft Wells * Change Map Fall 2011 to 2015 Deep Wells * Change Map Fall 2011 to 2015 Intermediate Wells * Change Map Fall 2011 to 2015 Shallow Wells * Change Map Fall 2011 to 2015 100 to 450 Ft Wells * Change Map Spring 2011 to 2015 Deep Wells * Change Map Spring 2011 to 2015 Intermediate Wells * Change Map Spring 2011 to 2015 Shallow Wells * Change Map Spring 2011 to 2015 100 to 450 Ft Wells * Change Map Summer 2011 to 2015 Deep Wells * Change Map Summer 2011 to 2015 Intermediate Wells * Change Map Summer 2011 to 2015 Shallow Wells * Change Map Summer 2011 to 2015 100 to 450 Ft Wells * Change Map Fall 2014 to 2015 Deep Wells * Change Map Fall 2014 to 2015 Intermediate Wells * Change Map Fall 2014 to 2015 Shallow Wells * Change Map Fall 2014 to 2015 100 to 450 Ft Wells * Change Map Spring 2014 to 2015 Deep Wells * Change Map Spring 2014 to 2015 Intermediate Wells * Change Map Spring 2014 to 2015 Shallow Wells * Change Map Spring 2014 to 2015 100 to 450 Ft Wells * Change Map Summer 2014 to 2015 Deep Wells * Change Map Summer 2014 to 2015 Intermediate Wells * Change Map Summer 2014 to 2015 Shallow Wells * Change Map Summer 2014 to 2015 100 to 450 Ft Wells * Change Map Summer 2014 to 2015 100 to 450 Ft Wells * Contour Map Fall 2015 100 to 450 Ft Wells * Contour Map Spring 2015 100 to 450 Ft Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2014 Deep Wells * Change Map Fall 2004 to 2014 Intermediate Wells * Change Map Fall 2004 to 2014 Shallow Wells * Change Map Fall 2004 to 2014 100 to 450 Ft Wells * Change Map Spring 2004 to 2014 Deep Wells * Change Map Spring 2004 to 2014 Intermediate Wells * Change Map Spring 2004 to 2014 Shallow Wells * Change Map Spring 2004 to 2014 100 to 450 Ft Wells * Change Map Summer 2004 to 2014 Deep Wells * Change Map Summer 2004 to 2014 Intermediate Wells * Change Map Summer 2004 to 2014 Shallow Wells * Change Map Summer 2004 to 2014 100 to 450 Ft Wells * Change Map Fall 2013 to 2014 Deep Wells * Change Map Fall 2013 to 2014 Intermediate Wells * Change Map Fall 2013 to 2014 Shallow Wells * Change Map Fall 2013 to 2014 100 to 450 Ft Wells * Change Map Spring 2013 to 2014 Deep Wells * Change Map Spring 2013 to 2014 Intermediate Wells * Change Map Spring 2013 to 2014 Shallow Wells * Change Map Spring 2013 to 2014 100 to 450 Ft Wells * Change Map Summer 2013 to 2014 Deep Wells * Change Map Summer 2013 to 2014 Intermediate Wells * Change Map Summer 2013 to 2014 Shallow Wells * Change Map Summer 2013 to 2014 100 to 450 Ft Wells * Contour Map Spring 2014 100 to 400 Ft Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2013 Deep Wells * Change Map Fall 2004 to 2013 Intermediate Wells * Change Map Fall 2004 to 2013 Shallow Wells * Change Map Spring 2004 to 2013 Deep Wells * Change Map Spring 2004 to 2013 Intermediate Wells * Change Map Spring 2004 to 2013 Shallow Wells * Change Map Summer 2004 to 2013 Deep Wells * Change Map Summer 2004 to 2013 Intermediate Wells * Change Map Fall 2012 to 2013 Deep Wells * Change Map Fall 2012 to 2013 Intermediate Wells * Change Map Fall 2012 to 2013 Shallow Wells * Change Map Spring 2012 to 2013 Deep Wells * Change Map Spring 2012 to 2013 Intermediate Wells * Change Map Spring 2012 to 2013 Shallow Wells * Change Map Summer 2012 to 2013 Deep Wells * Change Map Summer 2012 to 2013 Intermediate Wells * Change Map Summer 2012 to 2013 Shallow Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2012 Deep Wells * Change Map Fall 2004 to 2012 Intermediate Wells * Change Map Fall 2004 to 2012 Shallow Wells * Change Map Spring 2004 to 2012 Deep Wells * Change Map Spring 2004 to 2012 Intermediate Wells * Change Map Spring 2004 to 2012 Shallow Wells * Change Map Summer 2004 to 2012 Deep Wells * Change Map Summer 2004 to 2012 Intermediate Wells * Change Map Summer 2004 to 2012 Shallow Wells * Change Map Fall 2011 to 2012 Deep Wells * Change Map Fall 2011 to 2012 Intermediate Wells * Change Map Fall 2011 to 2012 Shallow Wells * Change Map Spring 2011 to 2012 Deep Wells * Change Map Spring 2011 to 2012 Intermediate Wells * Change Map Spring 2011 to 2012 Shallow Wells * Change Map Summer 2011 to 2012 Deep Wells * Change Map Summer 2011 to 2012 Intermediate Wells * Change Map Summer 2011 to 2012 Shallow Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2011 Deep Wells * Change Map Fall 2004 to 2011 Intermediate Wells * Change Map Fall 2004 to 2011 Shallow Wells * Change Map Spring 2004 to 2011 Deep Wells * Change Map Spring 2004 to 2011 Intermediate Wells * Change Map Spring 2004 to 2011 Observation Wells * Change Map Spring 2004 to 2011 Shallow Wells * Change Map Summer 2004 to 2011 Deep Wells * Change Map Summer 2004 to 2011 Intermediate Wells * Change Map Summer 2004 to 2011 Observation Wells * Change Map Summer 2004 to 2011 Shallow Wells * Change Map Fall 2010 to 2011 Deep Wells * Change Map Fall 2010 to 2011 Intermediate Wells * Change Map Fall 2010 to 2011 Shallow Wells * Change Map Spring 2010 to 2011 Deep Wells * Change Map Spring 2010 to 2011 Intermediate Wells * Change Map Spring 2010 to 2011 Observation Wells * Change Map Spring 2010 to 2011 Shallow Wells * Change Map Summer 2010 to 2011 Deep Wells * Change Map Summer 2010 to 2011 Intermediate Wells * Change Map Summer 2010 to 2011 Observation Wells * Change Map Summer 2010 to 2011 Shallow Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2010 Deep Wells * Change Map Fall 2004 to 2010 Intermediate Wells * Change Map Fall 2004 to 2010 Observation Wells * Change Map Fall 2004 to 2010 Shallow Wells * Change Map Spring 2004 to 2010 Deep Wells * Change Map Spring 2004 to 2010 Intermediate Wells * Change Map Spring 2004 to 2010 Observation Wells * Change Map Spring 2004 to 2010 Shallow Wells * Change Map Summer 2004 to 2010 Deep Wells * Change Map Summer 2004 to 2010 Intermediate Wells * Change Map Summer 2004 to 2010 Observation Wells * Change Map Fall 2009 to 2010 Deep Wells * Change Map Fall 2009 to 2010 Intermediate Wells * Change Map Fall 2009 to 2010 Observation Wells * Change Map Fall 2009 to 2010 Shallow Wells * Change Map Spring 2009 to 2010 Deep Wells * Change Map Spring 2009 to 2010 Intermediate Wells * Change Map Spring 2009 to 2010 Observation Wells * Change Map Spring 2009 to 2010 Shallow Wells * Change Map Summer 2009 to 2010 Deep Wells * Change Map Summer 2009 to 2010 Intermediate Wells * Change Map Summer 2009 to 2010 Observation Wells * Change Map Summer 2009 to 2010 Shallow Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2004 to 2009 Deep Wells * Change Map Fall 2004 to 2009 Intermediate Wells * Change Map Fall 2004 to 2009 Observation Wells * Change Map Fall 2004 to 2009 Shallow Wells * Change Map Spring 2006 to 2009 Deep Wells * Change Map Spring 2006 to 2009 Intermediate Wells * Change Map Spring 2006 to 2009 Observation Wells * Change Map Spring 2006 to 2009 Shallow Wells * Change Map Summer 2006 to 2009 Deep Wells * Change Map Summer 2006 to 2009 Intermediate Wells * Change Map Summer 2006 to 2009 Observation Wells * Change Map Summer 2006 to 2009 Shallow Wells * Change Map Fall 2008 to 2009 Deep Wells * Change Map Fall 2008 to 2009 Intermediate Wells * Change Map Fall 2008 to 2009 Observation Wells * Change Map Fall 2008 to 2009 Shallow Wells * Change Map Spring 2008 to 2009 Deep Wells * Change Map Spring 2008 to 2009 Intermediate Wells * Change Map Spring 2008 to 2009 Observation Wells * Change Map Spring 2008 to 2009 Shallow Wells * Change Map Summer 2008 to 2009 Deep Wells * Change Map Summer 2008 to 2009 Intermediate Wells * Change Map Summer 2008 to 2009 Observation Wells * Change Map Summer 2008 to 2009 Shallow Wells * Change Map Spring to Summer 2009 100 to 450 Ft Wells * Contour Map Fall 2009 100 to 400 Ft Wells * Contour Map Spring 2009 100 to 400 Ft Wells * Contour Map Summer 2009 100 to 400 Ft Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Fall 2007 to 2008 Deep Wells * Change Map Fall 2007 to 2008 Intermediate Wells * Change Map Fall 2007 to 2008 Observation Wells * Change Map Fall 2007 to 2008 Shallow Wells * Change Map Spring 2007 to 2008 100 to 450 Ft Wells * Change Map Summer 2007 to 2008 Deep Wells * Change Map Summer 2007 to 2008 Intermediate Wells * Change Map Summer 2007 to 2008 Observation Wells * Change Map Summer 2007 to 2008 Shallow Wells * Change Map Spring to Summer 2008 100 to 450 Ft Wells * Contour Map Fall 2008 100 to 400 Ft Wells * Contour Map Spring 2008 100 to 400 Ft Wells * Contour Map Summer 2008 100 to 400 Ft Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Spring to Summer 2007 100 to 450 Ft Wells * Contour Map Fall 2007 100 to 400 Ft Wells * Contour Map Spring 2007 100 to 400 Ft Wells * Contour Map Summer 2007 100 to 400 Ft Wells

Groundwater Elevation Change Maps summarize the change in groundwater level measurements over time, collected from wells in the northern Sacramento Valley by the Department of Water Resources (DWR) Northern Region Office (NRO) and monitoring cooperators. Groundwater Elevation Contour Maps display water level depth below ground surface. Northern Sacramento Valley groundwater levels are measured seasonally, during the annual water year, as part of our ongoing data collection program. Many of the wells have over 30 years of monitoring history, with the longest active monitoring well dating back to 1921. Groundwater level data provides valuable information regarding seasonal fluctuations and long-term changes in groundwater level trends over time. The groundwater level data presented in these figures includes the Sacramento Valley and Redding groundwater basin portions of Shasta, Tehama, Butte, Colusa, Glenn, and Sutter counties and are organized by year, season, well depth, and period of change. * Change Map Spring to Summer 2006 100 to 450 Ft Wells * Contour Map Spring 2006 100 to 400 Ft Wells * Contour Map Summer 2006 100 to 400 Ft Wells