Trinity River HU, Upper HA

Waterbody ID (WBID): CAR1064000319990607101807
County / counties: Trinity
Regional Water Board: Regional Board 1 - North Coast Region
Waterbody type: River & Stream
Condition category: Category 4a — TMDL completed
Integrated Report cycle: 2026

303(d) listings (2)

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
SedimentSediment	169531	List on 303(d) list (being addressed by USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Trinity River Sediment	—
Sedimentation/SiltationSediment	78099	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Trinity River Sediment	—

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: CAR1064000319990607101807
CALWNUM: 1106.400701, 1106.400703, 1106.400705, 1106.400706, 1106.400805, 1106.400807, 1106.400808, 1106.400907, 1106.401001, 1106.401003
WBD code: 180102110101, 180102110103, 180102110202, 180102110304, 180102110402, 180102110403, 180102110502, 180102110503, 180102110504, 180102110505
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: 1960.52 Miles

Derived facility associations

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

Derived

Trinity alps marina

Lewiston · No Exposure Certification · 0.44 km away

derived_nearby_in_watershed

Derived by California Stormwater Intelligence

Trinity Lake Marinas

Trinity Center · No Exposure Certification · 0.36 km away

derived_nearby_in_watershed

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.