← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Mendocino Coast HU, Big River HA, Big River

Waterbody ID (WBID)
CAR1133004319980708174237
County / counties
Mendocino
Regional Water Board
Regional Board 1 - North Coast Region
Waterbody type
River & Stream
Condition category
Category 5 — 303(d) listed, TMDL required
Integrated Report cycle
2026

303(d) listings (4)

Each row is one official listing decision from Appendix A of the Final 2026 California Integrated Report. Source terminology is preserved as published.

Pollutant / stressorDecision IDFinal listing decisionDecision statusTMDL requirement statusTMDL projectTMDL priority
Oxygen, DissolvedNutrients155303Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
SedimentSediment168885List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLBig River Sediment
Sedimentation/SiltationSediment74701List on 303(d) list (being addressed by USEPA approved TMDL)Original5B Addressed by USEPA-approved TMDLBig River Sediment
Temperature, waterOther Cause155305Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow

Source & provenance

Agency
California State Water Resources Control Board
Report
Final 2026 California Integrated Report
Dataset
Appendix A — 2026 303(d) List of Impaired Waters
Imported
Sep 16, 2026, 10:56 PM UTC
Waterbody ID
CAR1133004319980708174237
CALWNUM
1113.300101, 1113.300102, 1113.300103, 1113.300104, 1113.300201, 1113.300202, 1113.300203, 1113.300301, 1113.300302, 1113.300303, (Total Count: 15)
WBD code
180101080301, 180101080302, 180101080303, 180101080304, 180101080803
Geometry
Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

Location

Official 2026 Water Board geometry. Demonstration facility markers are shown for context only.

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Watershed
Assessed size
448.49 Miles

Derived facility associations

Industrial stormwater facilities geographically associated with this waterbody. These are derived spatial associations, not Water Board findings.

Derived
Bald Hills Quarry

Manchester · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Sch Bus Manintenance Yard

Mendocino · Notice of Intent · 0.95 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Facility records are official Industrial General Permit registrations, but the association between a facility and this waterbody is derived geographically (proximity or shared HUC12 subwatershed) and is not a Water Board receiving-water determination. Where a permit carries a Water Board-stated TMDL requirement naming this water, it is listed separately above.