Eel River HU, Middle Main HA

Waterbody ID (WBID): CAR1114106119990601095147
County / counties: Humboldt, Mendocino, 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 (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 / stressor	Decision ID	Final listing decision	Decision status	TMDL requirement status	TMDL project	TMDL priority
AluminumMetals	168396	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
SedimentSediment	168398	List on 303(d) list (being addressed by USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Eel River, Middle Mainstem Sediment & Temperature TMDLs	—
Sedimentation/SiltationSediment	74590	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Original	5B — Addressed by USEPA-approved TMDL	Eel River, Middle Mainstem Sediment & Temperature TMDLs	—
Temperature, waterOther Cause	155296	Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)	Revised	5B — Addressed by USEPA-approved TMDL	Eel River, Middle Mainstem Sediment & Temperature TMDLs	—

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: CAR1114106119990601095147
CALWNUM: 1111.320104, 1111.410102, 1111.410303, 1111.410501, 1111.420101, 1111.420102, 1111.420203, 1111.420601, 1111.420604, 1111.500605
WBD code: 180101040507, 180101050101, 180101050109, 180101050203, 180101050205, 180101050302, 180101050303, 180101050404, 180101050405, 180101051001
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: 1588.23 Miles

Derived facility associations

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

Derived

Drewry Quarry

Alderpoint · Notice of Intent · 0.69 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Fort Seward Quarry

Alderpoint · Notice of Intent · 0.81 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Kercher Quarry

Alderpoint · Notice of Intent · 0.09 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.