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Introduction

To manage groundwater, it is important to know its depth below the surface. This information can be used to determine the amount of groundwater that can safely be withdrawn for use. From the data provided by monitoring, local water managers can prevent wells from going dry and prevent the movement of poor quality groundwater into an aquifer.

Data Collection & Management

DWR's Northern Region and its cooperators monitor groundwater levels in over 1,000 wells in Northern California. These measurements are made twice a year: once in spring, when levels are highest, and once in fall, when levels are lowest. In some areas, groundwater levels are measured quarterly. The Northern Region maintains an electronic database of groundwater level measurements for Northern California. The database contains over 100,000 individual groundwater level measurements, some dating back to the early 1920's. These data are available in printed reports or in electronic format, accessible through a Map Interface or through a form interface, by Groundwater Basin or by Township.

Groundwater level data have also been summarized in the following formats:

Sacramento Valley Groundwater Level Monitoring Reports and Maps

Groundwater level monitoring reports and maps summarize the groundwater level measurements collected from wells in the northern Sacramento Valley. The groundwater level data presented includes the Sacramento Valley and Redding groundwater basin portions of Butte, Colusa, Glenn, Tehama, and Shasta counties.

 

Fall 2011

Plate 3S-A - Fall 2010 to Fall 2011 - GWE Change in Shallow Wells
Plate 3I-A - Fall 2010 to Fall 2011 - GWE Change in Intermediate Wells
Plate 3D-A - Fall 2010 to Fall 2011 - GWE Change in Deep Wells

 

Plate 3S-B - Fall 2004 to Fall 2011 - GWE Change in Shallow Wells
Plate 3I-B - Fall 2004 to Fall 2011 - GWE Change in Intermediate Wells
Plate 3D-B - Fall 2004 to Fall 2011 - GWE Change in Deep Wells

 

Summer 2011

Plate 1 - Summer 2010 to Summer 2011 - GWE Change in Shallow Wells
Plate 2 - Summer 2010 to Summer 2011 - GWE Change in Intermediate Wells
Plate 3 - Summer 2010 to Summer 2011 - GWE Change in Deep Wells
Plate 4 - Summer 2010 to Summer 2011 - GWE Change in Observation Wells

 

Plate 1 - Summer 2004 to Summer 2011 - GWE Change in Shallow Wells
Plate 2 - Summer 2004 to Summer 2011 - GWE Change in Intermediate Wells
Plate 3 - Summer 2004 to Summer 2011 - GWE Change in Deep Wells
Plate 4 - Summer 2004 to Summer 2011 - GWE Change in Observation Wells

 

Spring 2011

Plate 1 - Spring 2010 to Spring 2011 - GWE Change in Shallow Wells
Plate 2 - Spring 2010 to Spring 2011 - GWE Change in Intermediate Wells
Plate 3 - Spring 2010 to Spring 2011 - GWE Change in Deep Wells
Plate 4 - Spring 2010 to Spring 2011 - GWE Change in Observation Wells

 

Plate 1 - Spring 2004 to Spring 2011 - GWE Change in Shallow Wells
Plate 2 - Spring 2004 to Spring 2011 - GWE Change in Intermediate Wells
Plate 3 - Spring 2004 to Spring 2011 - GWE Change in Deep Wells
Plate 4 - Spring 2004 to Spring 2011 - GWE Change in Observation Wells

 

2010 Data will be posted soon.

 

Fall 2009

Groundwater Change Report Fall 2008 to Fall 2009 - Sacramento Valley and Redding Basins

Plate 1 - Fall 2008 to Fall 2009 GWE Change in Wells Up to 200 ft in Depth

Plate 2 - Fall 2008 to Fall 2009 GWE Change in Wells From 200 to 600 ft in Depth

Plate 3 - Fall 2008 to Fall 2009 GWE Change in Wells Over 600 ft in Depth

Plate 4 - Fall 2008 to Fall 2009 GWE Change in Dedicated Observation Wells

 

Groundwater Change Report Fall 2004 to Fall 2009 - Sacramento Valley and Redding Basins

Plate 1 - Fall 2004 to Fall 2009 GWE Change in Wells Up to 200 ft in Depth

Plate 2 - Fall 2004 to Fall 2009 GWE Change in Wells From 200 to 600 ft in Depth

Plate 3 - Fall 2004 to Fall 2009 GWE Change in Wells Over 600 ft in Depth

Plate 4 - Fall 2004 to Fall 2009 GWE Change in Dedicated Observation Wells

 

Summer 2009

Groundwater Change Report Summer 2008 to Summer 2009 and Summer 2006 to Summer 2009 - Sacramento Valley and Redding Basins

Plate 1 - Summer 2008 to Summer 2009 GWE Change in Wells up to 200 ft in depth

Plate 2 - Summer 2008 to Summer 2009 GWE Change in Wells From 200 to 600 ft in depth

Plate 3 - Summer 2008 to Summer 2009 GWE Change in Wells Over 600 ft in depth

Plate 4 - Summer 2008 to Summer 2009 GWE Change in Dedicated Observation Wells

Plate 5 - Summer 2006 to Summer 2009 GWE Change in Wells up to 200 ft in depth

Plate 6 - Summer 2006 to Summer 2009 GWE Change in Wells From 200 to 600 ft in depth

Plate 7 - Summer 2006 to Summer 2009 GWE Change in Wells Over 600 ft in depth

Plate 8 - Summer 2006 to Summer 2009 GWE Change in Dedicated Observation Wells

 

Spring 2009

Groundwater Change Report Spring 2008 to Spring 2009 Sacramento Valley and Redding Basins

Plate 1 - Spring 2008 to Spring 2009 - GWE Change in Wells Up to 200 ft in Depth

Plate 2 - Spring 2008 to Spring 2009 - GWE Change in Wells from 200 to 600 ft in Depth

Plate 3 - Spring 2008 to Spring 2009 - GWE Change in Wells Over 600 ft in Depth

Plate 4 - Spring 2008 to Spring 2009 - GWE Change in Dedicated Observation Wells

 

Groundwater Change Report Spring 2006 to Spring 2009-Sacramento Valley and Redding Basins

Plate 1 - Spring 2006 to Spring 2009 GWE Change in Wells Up to 200 ft in depth

Plate 2 - Spring 2006 to Spring 2009 GWE Change in Wells From 200 to 600 ft in depth

Plate 3 - Spring 2006 to Spring 2009 GWE Change in Wells Over 600 ft in depth

Plate 4 - Spring 2006 to Spring 2009 GWE Change in Observation Wells.

 

Fall 2008

Groundwater Change Report Fall 2007 to Fall 2008 - Sacramento Valley and Redding Basins

Plate 1 - Fall 2007 to Fall 2008 - GWE Change in Wells Up to 200 ft. in Depth

Plate 2 - Fall 2007 to Fall 2008 - GWE Change in Wells from 200 to 600 ft. in Depth

Plate 3 - Fall 2007 to Fall 2008 - GWE Change in Wells Over 600 ft in Depth

Plate 4 - Fall 2007 to Fall 2008 - GWE Change Map in Observation Wells

 

Summer 2008

Groundwater Change Report Summer 2007 to Summer 2008 Sacramento Valley and Redding Basins

Plate 1 - Summer 2007 to Summer 2008 GWE Change in Wells Up to 200 ft. in Depth

Plate 2 - Summer 2007 to Summer 2008 - GWE Change in Wells from 200 to 600 ft. in Depth

Plate 3 - Summer 2007 to Summer 2008 - GWE Change in Wells Over 600 ft.in Depth

Plate 4 - Summer 2007 to Summer 2008 - GWE Change Map in Observation Wells

 

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Sacramento Valley Groundwater Contour Maps

Groundwater contour maps have been created that show the approximate groundwater surface elevation using contour lines. Groundwater contour maps have also been created showing the change in groundwater elevation from one time period to another.

 

2011

Fall 2011 Contours in Intermediate Wells

Fall 2011 Contours in Shallow Wells

Summer 2011 Contours in Intermediate Wells

Summer 2011 Contours in Shallow Wells

Spring 2011 Contours in Intermediate Wells

Spring 2011 Contours in Shallow Wells

 

2009

Fall 2009 Contours

Fall 2009 Contours with Water Districts

Summer 2009 Contours

Summer 2009 Contours with Water Districts

Spring 2009 Contours

Spring 2009 Contours with Water Districts

Spring 2009 to Summer 2009 Change Contours

Spring 2009 to Summer 2009 Change Contours with Water Districts

 

2008

Fall 2008 Contours

Fall 2008 Contours with Water Districts

Summer 2008 Contours

Summer 2008 Contours with Water Districts

Spring 2008 Contours

Spring 2008 Contours with Water Districts

Spring 2008 to Summer 2008 Change Contours

Spring 2008 to Summer 2008 Change Contours with Water Districts

Spring 2007 to Spring 2008 Change Contours

Spring 2007 to Spring 2008 Change Contours with Water Districts

 

2007

Fall 2007 Contours

Fall 2007 Contours with Water Districts

Summer 2007 Contours

Summer 2007 Contours with Water Districts

Spring 2007 Contours

Spring 2007 Contours with Water Districts

Spring 2007 to Summer 2007 Change Contours

Spring 2007 to Summer 2007 Change Contours with Water Districts

 

2006

Summer 2006 Contours

Summer 2006 Contours with Water Districts

Spring 2006 Contours

Spring 2006 Contours with Water Districts

Spring 2006 to Summer 2006 Change Contours

Spring 2006 to Summer 2006 Change Contours with Water Districts

 

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Sacramento Valley Well Depth Summary Maps

Well depth summary maps have been created that show the approximate depth to water using groundwater contour lines. These maps also show Well Completion Report data that show the minimum, maximum, and average well depths per section for Butte, Colusa, Glenn, and Tehama counties. Additional maps that show the number of wells and well type per section can be accessed by clicking on the Well Completion Report link.

Butte County

Plate 1 - Butte County Domestic Well Depth Summary with Depth to Groundwater Contours for Wells Screened Less Than 150 feet in Depth.

Plate 2 - Butte County Large Production Well Depth Summary with Depth to Groundwater Contours for Wells Screened Greater Than 150 feet in Depth.

Colusa County

Plate 1 - Colusa County Domestic Well Depth Summary with Depth to Groundwater Contours for Wells Screened Less Than 150 feet in Depth.

Plate 2 - Colusa County Large Production Well Depth Summary with Depth to Groundwater Contours for Wells Screened Greater Than 150 feet in Depth.

Glenn County

Plate 1 - Glenn County Domestic Well Depth Summary with Depth to Groundwater Contours for Wells Screened Less Than 150 feet in Depth.

Plate 2 - Glenn County Large Production Well Depth Summary with Depth to Groundwater Contours for Wells Screened Greater Than 150 feet in Depth.

Tehama County

Plate 1 - Tehama County Domestic Well Depth Summary with Depth to Groundwater Contours for Wells Screened Less Than 150 feet in Depth.

Plate 2 - Tehama County Large Production Well Depth Summary with Depth to Groundwater Contours for Wells Screened Greater Than 150 feet in Depth.

 

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