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L A Beale AFB Chico Clearlake Colusa Corning Cottonwood Gridley Kelseyville Lincoln Live Oak Lucerne Orland Oroville Paradise Red Bluff Redding Tehama Williams Willows Yuba City 13N 1E 13N 1W 13N 2E 13N 2W 13N 3E 13N 3W 13N 4E 13N 4W 13N 5E 13N 5W 13N 6E 13N 6W 13N 7E 13N 7W 13N 8W 13N 9W 14N 1E 14N 1W 14N 2E 14N 2W 14N 3E 14N 3W 14N 4E 14N 4W 14N 5E 14N 5W 14N 6E 14N 6W 14N 7E 14N 7W 14N 8W 14N 9W 15N 1E 15N 1W 15N 2E 15N 2W 15N 3E 15N 3W 15N 4E 15N 4W 15N 5E 15N 5W 15N 6E 15N 6W 15N 7E 15N 7W 15N 8W 15N 9W 16N 1E 16N 1W 16N 2E 16N 2W 16N 3E 16N 3W 16N 4E 16N 4W 16N 5E 16N 5W 16N 6E 16N 6W 16N 7E 16N 7W 16N 8W 16N 9W 17N 1E 17N 1W 17N 2E 17N 2W 17N 3E 17N 3W 17N 4E 17N 4W 17N 5E 17N 5W 17N 6E 17N 6W 17N 7E 17N 7W 17N 8W 17N 9W 18N 1E 18N 1W 18N 2E 18N 2W 18N 3E 18N 3W 18N 4E 18N 4W 18N 5E 18N 5W 18N 6E 18N 6W 18N 7E 18N 7W 18N 8W 18N 9W 19N 1E 19N 1W 19N 2E 19N 2W 19N 3E 19N 3W 19N 4E 19N 4W 19N 5E 19N 5W 19N 6E 19N 6W 19N 7E 19N 7W 19N 8W 19N 9W 20N 1E 20N 1W 20N 2E 20N 2W 20N 3E 20N 3W 20N 3.5E 20N 4E 20N 4W 20N 5E 20N 5W 20N 6E 20N 6W 20N 7E 20N 7W 20N 8W 20N 9W 21N 1E 21N 2E 21N 2W 21N 3E 21N 3W 21N 4E 21N 4W 21N 5E 21N 5W 21N 6E 21N 6W 21N 7E 21N 7W 21N 8W 21N 9W 22N 1E 22N 1W 22N 2E 22N 2W 22N 3E 22N 3W 22N 4E 22N 4W 22N 5E 22N 5W 22N 6E 22N 6W 22N 7E 22N 7W 22N 8W 22N 9W 23N 1E 23N 1W 23N 2E 23N 2W 23N 3E 23N 3W 23N 4E 23N 4W 23N 5E 23N 5W 23N 6E 23N 6W 23N 7E 23N 7W 23N 8W 23N 9W 23.5N 2E 24N 1E 24N 1W 24N 2E 24N 2W 24N 3E 24N 3W 24N 4E 24N 4W 24N 5E 24N 5W 24N 6E 24N 6W 24N 7E 24N 7W 24N 8W 24N 9W 25N 1E 25N 1W 25N 2E 25N 2W 25N 3E 25N 3W 25N 4W 25N 5E 25N 5W 25N 6E 25N 6W 25N 7E 25N 7W 25N 8W 25N 9W 26N 1E 26N 1W 26N 2E 26N 2W 26N 3E 26N 3W 26N 4E 26N 4W 26N 5E 26N 5W 26N 6E 26N 6W 26N 7E 26N 7W 26N 8W 26N 9W 27N 1E 27N 1W 27N 2E 27N 2W 27N 3E 27N 3W 27N 4E 27N 4W 27N 5E 27N 5W 27N 6E 27N 6W 27N 7E 27N 7W 27N 8W 27N 9W 28N 1E 28N 1W 28N 2E 28N 2W 28N 3E 28N 3W 28N 4W 28N 5E 28N 5W 28N 6E 28N 6W 28N 7E 28N 7W 28N 8W 28N 9W 28.5N 3W 29N 1E 29N 1W 29N 2E 29N 2W 29N 2.5W 29N 3E 29N 3W 29N 4E 29N 4W 29N 5E 29N 5W 29N 6E 29N 6W 29N 7E 29N 7W 29N 8W 30N 1E 30N 1W 30N 2E 30N 2W 30N 3E 30N 3W 30N 4E 30N 4W 30N 5E 30N 5W 30N 6E 30N 6W 30N 7E 30N 7W 30N 8W 31N 1E 31N 1W 31N 2E 31N 2W 31N 3E 31N 3W 31N 4E 31N 4W 31N 5E 31N 5W 31N 6E 31N 6W 31N 7E 31N 7W 31N 8W 32N 1E 32N 1W 32N 2E 32N 2W 32N 3E 32N 3W 32N 4E 32N 4W 32N 5E 32N 5W 32N 6E 32N 6W 32N 7E 32N 7W 32N 8W 10E1 7C1 14Q3 5B4 9H5 1R3 2J1 12A4 28J1 29N2 18R6 28M3 3R3 18D2 13Q3 4G3 32P3 34Q3 35P2 1N2 29N4 14H5 34N3 24D3 2E1 5J4 11B2 5B1 22D4 10A1 24A3 13C4 35L1 5Q4 29Q3 24E1 9H2 20A1 12P2 15C2 3R2 18C1 30H2 18L1 8Q1 28J5 4G2 33M1 13C3 11B3 18D1 18R5 27G1 24D2 35P1 24B1 34Q2 35B2 7E1 28M2 18C1 31M1 1N1 12A3 29N1 14H4 14H3 GLENN BUTTE COLUSA TEHAMA SHASTA Annual Change in Groundwater Elevation > 6 to 8 feet lower > 4 to 6 feet lower > 2 to 4 feet lower > 0 to 2 feet lower 0 to 2 feet higher > 2 to 4 feet higher > 4 to 6 feet higher > 6 to 8 feet higher Greater than 8 feet lower Greater than 8 feet higher County Boundaries Redding GW Basin Sacramento Valley GW Basin 0 2 4 6 1 Miles ¢ ! ( Monitoring Well NOTES GWE - Groundwater Elevation bgs - below ground surface Note 6: This map may not use all the color ranges shown in table above. Not all wells will be visible on map due to close proximity to each other. Note 3: Note 2: Statistical analysis is based on the number of monitored wells within each county. Summary results are based on the total number of wells monitored, not averages of the statistical analysis of individual counties. Note 1: A positive number indicates that groundwater elevations were higher in the current year than in the previous year. A negative number indicates that groundwater elevations were lower in current year than in the previous year. Change in groundwater elevations are based on the actual measured levels of the hydrostatic level (piezometric surface) of the water at individual well locations. Contoured color ramping and change in groundwater elevation estimates between monitoring wells is a computer generated calculation based on the inverse distance weighted method using the availability and proximity of surrounding monitoring well measurements. As such, the calculated change in groundwater elevation between individual monitoring wells should be considered approximate. The accuracy of the estimated contour is directly related to the spacing and the distribution of nearby monitoring wells, the similarity of nearby monitoring well construction, and the local changes or similarities in aquifer characteristics. Note 5: Groundwater level changes are based on groundwater level measurements taken from wells constructed in the deep aquifer zone at similar dates of different years. These wells include those that have screened intervals and well depths that are generally greater than 600 ft. Note 4: Location: R:\Sections\DCM\CHANGE_MAP\2011\ http://www.water.ca.gov/groundwater/data_and_monitoring/northern_region/GroundwaterLevel/gw_level_monitoring.cfm PLATE 3D-A DEPARTMENT OF WATER RESOURCES BY: G. Gordon Date: March 2012 STATE OF CALIFORNIA THE RESOURCES AGENCY NORTHERN REGION OFFICE 2440 Main Street Red Bluff, California 96080 (530) 529-7300 NORTHERN SACRAMENTO VALLEY CHANGE IN GROUNDWATER ELEVATION MAP DEEP AQUIFER ZONE (Wells generally greater 600 ft bgs) FALL 2010 TO FALL 2011 Tehama County - Sacramento Valley GW Basin Maximum Increase GWE (ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 5.9 14.0 844.6 1.2 -0.9 Butte County - Sacramento Valley GW Basin Maximum Increase GWE (ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 8.2 14.0 856.8 2.1 -8.0 Colusa County - Sacramento Valley GW Basin Maximum Increase GWL(ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 4.1 11.0 905.5 0.3 -4.1 Glenn County - Sacramento Valley GW Basin Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 25.0 924.1 -7.2 -41.6 Maximum Increase GWE (ft) 2.3 Summary Results for Fall 2010 to Fall 2011 Change in Groundwater Elevation Maximum Increase GWE (ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 8.2 67.0 885.5 -1.9 -41.6 Shasta County - Redding GW Basin Maximum Increase GWE (ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 2.2 2.0 790.0 2.2 NA Tehama County - Redding GW Basin Maximum Increase GWE (ft) Maximum Decrease GWE (ft) Average Change GWE (ft) Average Well Depth (ft) Number of Wells Monitored 1.3 1.0 865.0 1.3 NA