Mad River Valley – Lowland

Mad River Valley – Lowland


  • Basin Name
  • Mad River Valley – Lowland
  • Basin Number
  • 1-008.01
  • SGMA Basin Priority
  • Very Low
  • Critically Overdrafted
  • No
  • Hydrologic Region Name
  • North Coast
  • Counties
  • Humboldt
  • Adjacent Basins
  • Mad River Valley - Dows Prairie School Area 1-008.02,


Located in California’s North Coast Hydrologic Region hydrologic region, the Mad River Valley – Lowland is 25,600 acres in size. This Very Low priority basin is home to an estimated 22,224 people (2010 value), which have been at a rate of .

Mad River Valley – Lowland is a(n) mixed urban/agriculture (2) basin with approximately 355 wells, of which approximately 6 are water supply wells. Groundwater accounts for approximately 70 percent of the basin’s water supply.

Basin Notes

1975: Ground-water Conditions in the Eureka Area, Humboldt County, California, U.S. Geological Survey

2003: Bulletin 118 basin description

2003: Mad River Valley division into two subbasins, Bulletin 118 update

2018: County of Humboldt response to draft change of the subbasin priority from low to medium, which subjects it to SGMA.

2018 Basin Prioritization: Status of basin remains unchanged at very low.

GSA Information

Not Subject to SGMA No items found