← Impaired waters

Waterbody profile

Official Water Board record · 2026 cycle

Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River

Waterbody ID (WBID)
CAR1053107519990610152950
County / counties
Del Norte, Humboldt, Siskiyou
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 (7)

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
Benthic Community EffectsOther Cause169293List on 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Cyanobacteria hepatotoxic microcystinsOther Cause76439List on 303(d) list (being addressed by USEPA approved TMDL)Original5B Addressed by USEPA-approved TMDLKlamath River Nutrients, Temperature, DO, and Microcystin.
MicrocystinsOther Cause161483List on 303(d) list (being addressed by USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLKlamath River Nutrients, Temperature, DO, and Microcystin.
NutrientsNutrients168830Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLKlamath River Nutrients, Temperature, DO, and Microcystin.
Organic Enrichment/Low Dissolved OxygenNutrients75877Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLKlamath River Nutrients, Temperature, DO, and Microcystin.
SedimentSediment168834Do Not Delist from 303(d) list (TMDL required list)Revised5A TMDL still requiredLow
Temperature, waterOther Cause155226Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL)Revised5B Addressed by USEPA-approved TMDLKlamath River Nutrients, Temperature, DO, and Microcystin.

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
CAR1053107519990610152950
CALWNUM
1105.120302, 1105.210305, 1105.310102, 1105.310205, 1105.310403, 1105.310406, 1105.310407, 1105.310601, 1105.310604, 1105.310705
WBD code
180102061101, 180102090101, 180102090102, 180102090103, 180102090104, 180102090201, 180102090202, 180102090301, 180102090302, 180102090601
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
4324.29 Miles

Derived facility associations

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

Derived
Happy Camp Transfer Station

Happy Camp · Notice of Intent · 0.06 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Waddell Pit

Happy Camp · Notice of Intent · 0.04 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.