Klamath River HU, Middle HA and Lower HA, Scott River to Trinity River
2026 303(d) list Waterbody ID CAR1053107519990610152950 River & Stream Region 1 · North Coast
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 7 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 7 pollutants in 3 Appendix A categories
- Nutrients (2) · Other Cause (4) · Sediment (1)
- Listing decisions
- TMDL information Evidence: State-published
- 7 decisions with a TMDL requirement status; 5 name a TMDL project
- Status codes as published: 5A, 5B
- TMDL details
- Industrial stormwater facilities
- 0 report it as their receiving water Evidence: identification corroborated
- 4 within 1 km Evidence: geographic proximity
- Neither count establishes a discharge · Facilities
What a 303(d) listing means
The Clean Water Act section 303(d) list names waters that do not meet water quality standards for one or more pollutants or stressors. California publishes it in the Integrated Report; this page shows the 2026 decisions from Appendix A as published.
- A listing describes the condition of the waterbody. It does not identify which sources cause the impairment, and it does not by itself place a requirement on any particular facility.
- Listed waters do not all have the same status. The Integrated Report category says how an impairment is being addressed: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant. This waterbody's decisions are in category 5.
- TMDL requirement status values (such as 5A or 5B) are shown exactly as published in Appendix A.
2026 listing status Evidence: State-published
- On the 2026 303(d) list
- Yes
- Appendix A decisions
- 7
- Integrated Report category
- 5 (a TMDL is required)
- Listing cycle
- 2026
- State Board adoption
- 2026-02-03 (Resolution 2026-0005)
- USEPA approval
- not confirmed — submittal letter to USEPA published; no approval found on the report page (checked 2026-10-22)
- Regional Water Board
- 1 — North Coast
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. A listing describes the condition of this waterbody, not of any facility.
Location
Loading the waterbody shape…
Open this area on the statewide map · Browse impaired waters
Listing decisions and pollutants Evidence: State-published
Grouped by the Pollutant Category published in Appendix A. Pollutant names, categories and decisions are exactly as published.
Nutrients (2 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Nutrients | Nutrients | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | Agriculture Drainage/Filling Of Wetlands Grazing-Related Sources Irrigated Crop Production Logging Road Construction/Maintenance Road Construction Silviculture | 168830 |
| Organic Enrichment/Low Dissolved Oxygen | Nutrients | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | Agriculture Drainage/Filling Of Wetlands Grazing-Related Sources Irrigated Crop Production Logging Road Construction/Maintenance Road Construction Silviculture | 75877 |
Other Cause (4 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Benthic Community Effects | Other Cause | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 169293 |
| Cyanobacteria hepatotoxic microcystins | Other Cause | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Agriculture Drainage/Filling Of Wetlands Grazing-Related Sources Irrigated Crop Production Logging Road Construction/Maintenance Road Construction Silviculture | 76439 |
| Microcystins | Other Cause | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Revised | A Source Unknown | 161483 |
| Temperature, water | Other Cause | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Revised | Agriculture Drainage/Filling Of Wetlands Flow Alteration/Regulation/Modification Grazing-Related Sources Irrigated Crop Production Logging Road Construction/Maintenance Removal of Riparian Vegetation Road Construction Silviculture | 155226 |
Sediment (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Sediment | Sediment | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | A Source Unknown | 168834 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Benthic Community Effects | 5A | — | Low | — | — |
| Cyanobacteria hepatotoxic microcystins | 5B | Klamath River Nutrients, Temperature, DO, and Microcystin. | — | 2010-12-28 | — |
| Microcystins | 5B | Klamath River Nutrients, Temperature, DO, and Microcystin. | — | 2010-12-28 | — |
| Nutrients | 5B | Klamath River Nutrients, Temperature, DO, and Microcystin. | — | 2010-12-28 | — |
| Organic Enrichment/Low Dissolved Oxygen | 5B | Klamath River Nutrients, Temperature, DO, and Microcystin. | — | 2010-12-28 | — |
| Sediment | 5A | — | Low | — | — |
| Temperature, water | 5B | Klamath River Nutrients, Temperature, DO, and Microcystin. | — | 2010-12-28 | — |
This is TMDL information for the waterbody. It does not establish that a TMDL applies to any particular facility. Facility-specific TMDL requirements recorded in SMARTS appear on facility pages and are not linked to this waterbody until reviewed.
HUC12 watersheds
Published with the listing Evidence: publisher-reported
- Grider Creek 180102061101
- South Fork Indian Creek 180102090101
- Upper Indian Creek 180102090102
- East Fork Indian Creek 180102090103
- Lower Indian Creek 180102090104
- Thompson Creek 180102090201
- Fort Goff Creek-Klamath River 180102090202
- Upper Elk Creek 180102090301
- East Fork Elk Creek 180102090302
- Oak Flat Creek-Klamath River 180102090601
Overlapping the waterbody's shape Evidence: spatial
- Horse Creek 180102061004
- Kohl Creek-Klamath River 180102061005
- Grider Creek 180102061101 also published
- Seiad Creek 180102061102
- Bittenbender Creek-Klamath River 180102061103
- South Fork Indian Creek 180102090101 also published
- Upper Indian Creek 180102090102 also published
- East Fork Indian Creek 180102090103 also published
- Lower Indian Creek 180102090104 also published
- Thompson Creek 180102090201 also published
- Fort Goff Creek-Klamath River 180102090202 also published
- China Creek-Klamath River 180102090203
- Upper Elk Creek 180102090301 also published
- East Fork Elk Creek 180102090302 also published
- Lower Elk Creek 180102090303
- Tenmile Creek 180102090401
- Upper Clear Creek 180102090402
- Lower Clear Creek 180102090403
- North Fork Dillon Creek 180102090501
- Copper Creek-Dillon Creek 180102090502
- Oak Flat Creek-Klamath River 180102090601 also published
- Independence Creek 180102090602
- Ukonom Creek 180102090603
- Titus Creek-Klamath River 180102090604
- Swillup Creek-Klamath River 180102090605
- Rock Creek 180102090701
- Ti Creek-Klamath River 180102090702
- Reynolds Creek-Klamath River 180102090703
- Camp Creek 180102090801
- Boise Creek-Klamath River 180102090802
- Red Cap Creek 180102090803
- Bluff Creek 180102090804
- Slate Creek-Klamath River 180102090805
- Tully Creek-Klamath River 180102091002
- Somes Creek-Salmon River 180102100404
Industrial stormwater facilities
Evidence: identification corroborated
Shows: the facility named this waterbody as its receiving water in SMARTS, and the name and the facility's location are consistent with it. Does not establish: a discharge pathway, a discharge of any pollutant, or a cause of the listing.
Evidence: geographic proximity
Shows: the facility's reported location is within 1 km of the waterbody's mapped shape. Does not establish: that the facility discharges to this waterbody, or any other relationship.
Report this waterbody as their receiving water Evidence: identification corroborated
No facility's reported receiving water is identified as this waterbody.
Within 1 km of a facility's reported location Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near this waterbody does not mean a facility discharges to it.
| Facility | WDID | Status | Distance | Map |
|---|---|---|---|---|
| Waddell Pit | 1 47I029070 | Active | 36 m | map |
| Happy Camp Transfer Station | 1 47I022664 | Active | 62 m | map |
| PSP JV Happy Camp Yard | 1 47I029051 | Terminated | 163 m | map |
| Rons Used Cars and Auto Wreck | 1 47I009997 | Terminated | 440 m | map |
4 facilities, nearest first.
Sources and provenance
| Information | Source | Retrieved |
|---|---|---|
| Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12) | USGS | 2026-10-22 |
| 2026 California Integrated Report, Appendix A: 2026 303(d) List (final) | SWRCB | 2026-10-22 |
| Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0) | SWRCB GIS | 2026-10-22 |
| SMARTS TMDL requirements | SMARTS | 2026-10-21 |
Relationships computed 2026-10-22 (facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1).
Integrated Report categories: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant.