Sacramento Valley – Colusa

Statistics

Basin Notes

2003: Bulletin 118 basin description

2014: Basin prioritization – medium. Comments: Severely declining GW levels along the west-side of Glenn Co. Moderately declining GW levels in the Capay area. High TDS shallow aquifer in Maxwell- Williams area. Increase in housing development along I5. GW-SW interaction is important to maintaining waterfowl refuges. Area is being highlighted as solution area for Delta outflow issues…proposed increase in CU and GW pumping.

2016: Basin boundary modification

Revised basin boundary description

2018: Priority – high Per 2018 draft basin prioritization: Groundwater-related transfer  “Type A” in which local groundwater is pumped to compensate for exported supply Butte County basin boundary/consolidation request for Colusa and the Wyandotte Creek 5-021.69, Corning 5-021.51,  Vina 5-021.57, West Butte 5-021.58, East Butte 5-021.59, Sutter 5-021.62 subbasins pending Basin boundary modification approved. Per DWR: It “revises the central-easterly boundary of the Colusa and West Butte subbasins to extend easterly to follow the western boundary of Reclamation District 1004. The revision places the Colusa Groundwater Authority wholly within the Colusa subbasin.” Phase 2 draft priority: high.

2022: January 28 – Groundwater Sustainability Plan submitted to DWR

2023: October 26 – DWR assessed the plan incomplete and gave the GSA 180 days to correct deficiencies.

December 11 – Addressing Groundwater Overdraft in the Sacramento Valley, Public Policy Institute of California

At-A-Glance

Source: CA DWR
Source: CA DWR

California Water Library Documents About This Basin

Groundwater sustainability and land subsidence in California’s Central Valley

Water (MDPI) | April 22nd, 2024

The Central Valley of California is one of the most prolific agricultural regions in the world. Agriculture is reliant on the conjunctive use of surface-water and groundw

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Statement of Findings Regarding the Determination of Incomplete Status of the Sacramento Valley – Colusa Subbasin Groundwater Sustainability Plan

California Department of Water Resources (DWR) | October 26th, 2023

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Thousands of domestic and public supply wells face failure despite groundwater sustainability reform in California’s Central Valley

Nature Portfolio (Springer Nature) | September 8th, 2023

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Subsurface water flux in California's Central Valley and its source watershed from space geodesy

American Geophysical Union (AGU) | September 29th, 2022

We combine measurements from Global Positioning System positioning and Gravity Recovery and Climate Experiment gravity to infer change in water components in Central Vall

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Colusa Subbasin Groundwater Sustainability Plan

Colusa Groundwater Authority | December 3rd, 2021

The purpose of this GSP is to characterize groundwater conditions in the Subbasin, evaluate and report on existing conditions relating to the six sustainability indicator

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Sutter County Groundwater Management Plan

Sutter County | March 19th, 2012

Sutter County intends this GMP to be relevant for the entire County. Sutter County overlies the south central part of the Sacramento Valley Groundwater Basin, and specif

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Ground-Water Quality Data in the Middle Sacramento Valley Study Unit, 2006—Results from the California GAMA Program

U.S. Geological Survey (USGS) | July 15th, 2008

Ground-water quality in the approximately 3,340 mi2 Middle Sacramento Valley study unit (MSACV) was investigated from June through September, 2006, as part of the Califor

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Stony Creek Fan Conjunctive Water Management Plan Feasibility Investigation

Glenn-Colusa Irrigation District | February 15th, 2004

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Late Cenozoic Tectonism of the Sacramento Valley, California

U.S. Geological Survey (USGS) | July 15th, 1987

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Geochemistry of Ground Water in the Sacramento Valley, California

U.S. Geological Survey (USGS) | July 13th, 1984

A geochemical investigation was done to evaluate temporal changes in water quality and to determine the processes that control water chemistry in shallow ground water of

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GSA Information