Big Valley (Lassen, Modoc)

Source: CA DWR

Big Valley (Lassen, Modoc)


  • Basin Name
  • Big Valley (Lassen, Modoc)
  • Basin Number
  • 5-004
  • SGMA Basin Priority
  • Medium
  • Critically Overdrafted
  • No
  • Hydrologic Region Name
  • Counties
  • Lassen, Modoc
  • Adjacent Basins
  • ,


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 1,046.00 people (2010 value), which have been at a rate of 3.82.

Big Valley (Lassen, Modoc) is a(n) basin with approximately 419 wells, of which approximately 4 are water supply wells. Groundwater accounts for approximately 65 percent of the basin’s water supply.

Source: CA DWR
Source: CA DWR

Basin Notes

2003: Bulletin 118 basin description

2007: Lassen County Groundwater Management Plan

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.

GSA Information

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