Big Valley (Lassen, Modoc)
Statistics
- Basin Name
- Big Valley (Lassen, Modoc)
- Basin Number
- 5-004
- SGMA Basin Priority
- Medium
- Critically Overdrafted
- No
- Hydrologic Region Name
- Sacramento River
- Counties
- Lassen, Modoc
- Adjacent Basins
-
Round Valley 5-036,
At-A-Glance
Located in California’s Sacramento River hydrologic region, the Big Valley (Lassen, Modoc) is 92,067 acres in size. This Medium priority basin is home to an estimated 1,046 people (2010 value). It has approximately 413 wells, of which approximately four are public supply wells. Groundwater accounts for approximately 65 percent of the basin’s water supply.
Basin Notes
2003: Bulletin 118 basin description
2014: CASGEM Basin Prioritization: medium. Comment: Declining groundwater levels across much of the basin.
2018: Basin prioritization comments: Lassen County BMOs recognize GW decline. 1) Headwaters for Pit River/Central Valley Project – Lake Shasta. 2) Extensive restoration project at Ash Creel State Wildlife Area has improved gwls in immediate vicinity of project but delining gwls over past 10 years persist outside of project area, which includes numerous wetlands and tributaries to the Pit River.
2022: January 27 – GSP submitted to DWR
2023: October 26 – GSP deemed incomplete. GSA given 180 days to address deficiencies.