Trinity River HU, Lower Trinity HA
2026 303(d) list Waterbody ID CAR1061103419990607150231 River & Stream Region 1 · North Coast
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 4 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 4 pollutants in 3 Appendix A categories
- Metals (1) · Other Cause (1) · Sediment (2)
- Listing decisions
- TMDL information Evidence: State-published
- 4 decisions with a TMDL requirement status; 2 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
- 8 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
- 4
- 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.
Metals (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Aluminum | Metals | 5 | Do Not Delist from 303(d) list (TMDL required list) | Original | A Source Unknown | 169526 |
Other Cause (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Temperature, water | Other Cause | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 155245 |
Sediment (2 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Sediment | Sediment | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | Channel Erosion Dam Construction Drainage/Filling Of Wetlands Erosion/Siltation Flow Alteration/Regulation/Modification Habitat Modification Harvesting, Restoration, Residue Management Hydromodification Logging Road Construction/Maintenance Mine Tailings Natural Sources Removal of Riparian Vegetation Resource Extraction Silvicultural Point Sources Silviculture Streambank Modification/Destabilization Surface Mining Upstream Impoundment | 169527 |
| Sedimentation/Siltation | Sediment | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | Original | Channel Erosion Dam Construction Drainage/Filling Of Wetlands Erosion/Siltation Flow Alteration/Regulation/Modification Habitat Modification Harvesting, Restoration, Residue Management Hydromodification Logging Road Construction/Maintenance Mine Tailings Natural Sources Removal of Riparian Vegetation Resource Extraction Silvicultural Point Sources Silviculture Streambank Modification/Destabilization Surface Mining Upstream Impoundment | 78050 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Aluminum | 5A | — | Low | — | — |
| Sediment | 5B | Trinity River Sediment | — | 2001-12-20 | — |
| Sedimentation/Siltation | 5B | Trinity River Sediment | — | 2001-12-20 | — |
| Temperature, water | 5A | — | Low | — | — |
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
- East Fork North Fork Trinity River 180102110904
- East Fork New River 180102111003
- Devils Canyon 180102111004
- Big Creek 180102111006
- Big French Creek 180102111103
- Don Juan Creek-Trinity River 180102111105
- McDonald Creek-Trinity River 180102111106
- Cedar Creek 180102111202
- Mill Creek 180102111207
- Soctish Creek-Trinity River 180102111208
Overlapping the waterbody's shape Evidence: spatial
- Tully Creek-Klamath River 180102091002
- Upper Canyon Creek 180102110801
- Lower Canyon Creek 180102110802
- Rattlesnake Creek 180102110901
- Upper North Fork Trinity River 180102110902
- Middle North Fork Trinity River 180102110903
- East Fork North Fork Trinity River 180102110904 also published
- Lower North Fork Trinity River 180102110905
- Virgin Creek 180102111001
- Slide Creek 180102111002
- East Fork New River 180102111003 also published
- Devils Canyon 180102111004 also published
- Quinby Creek-New River 180102111005
- Big Creek 180102111006 also published
- Bell Creek-New River 180102111007
- Conner Creek Trinity River 180102111101
- Big Bar Creek-Trinity River 180102111102
- Big French Creek 180102111103 also published
- Little French Creek-Trinity River 180102111104
- Don Juan Creek-Trinity River 180102111105 also published
- McDonald Creek-Trinity River 180102111106 also published
- Sharber Creek-Trinity River 180102111107
- Willow Creek 180102111201
- Cedar Creek 180102111202 also published
- Horse Linto Creek 180102111203
- Tish Tang a Tang Creek 180102111204
- Supply Creek 180102111205
- Campbell Creek-Trinity River 180102111206
- Mill Creek 180102111207 also published
- Soctish Creek-Trinity River 180102111208 also published
- Deerhorn Creek-Trinity River 180102111209
- Mingo Creek-South Fork Trinity River 180102120505
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 |
|---|---|---|---|---|
| Eagle Rock Inc | 1 53I000476 | Active | 24 m | map |
| Brannan Mountain Quarry | 1 12I029584 | Active | 30 m | map |
| Brannan Mountain Quarry | 1 12NNA001915 | No Action Required | 30 m | map |
| Mercer Fraser Co Willow Creek | 1 12I019048 | Active | 87 m | map |
| Smith Pit | 1 53I029185 | Terminated | 97 m | map |
| R Brown Sons Quarry | 1 12I015562 | Active | 180 m | map |
| Buddys Auto Center Inc | 1 12I015025 | Terminated | 196 m | map |
| Hoopa Valley Aggregate and Ready Mix | 1 12I025712 | Terminated | 344 m | map |
8 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.