Trinity River HU, South Fork HA

Waterbody ID (WBID): CAR1062302019990216114308
County / counties: Humboldt, Trinity
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 (6)

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

Pollutant / stressor	Decision ID	Final listing decision	Decision status	TMDL requirement status	TMDL project	TMDL priority
BoronMetals	169529	Do Not Delist from 303(d) list (TMDL required list)	Original	5A — TMDL still required	—	Low
Hardness as CaCO3Toxic Inorganics	155250	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
SedimentSediment	169530	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Trinity River Sediment	—
Sedimentation/SiltationSediment	69072	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Trinity River Sediment	—
Specific ConductivitySALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES	163082	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Temperature, waterOther Cause	155249	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low

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: CAR1062302019990216114308
CALWNUM: 1106.210301, 1106.230301, 1106.230402, 1106.230701, 1106.250103, 1106.250202, 1106.250304, 1106.250406, 1106.250407, 1106.250506
WBD code: 180102111107, 180102111206, 180102120103, 180102120203, 180102120204, 180102120302, 180102120401, 180102120402, 180102120405, 180102120503
Geometry: Official Water Board GIS (CA_WATERBOARDS_GIS_FINAL_2026)

View official Water Board fact sheet ↗Download Appendix A source file ↗

Location

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

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Watershed: —
Assessed size: 4200.97 Miles

Derived facility associations

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

Derived

Mann Mine

Hayfork · Notice of Intent · 0.11 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Mercer Fraser Co Willow Creek

Willow Creek · Notice of Intent

derived_watershed_association

Derived by California Stormwater Intelligence

Monument Quarry

Rio Dell · Notice of Intent · 0.25 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.