Merced River, Lower (McSwain Reservoir to San Joaquin River)

Waterbody ID (WBID): CAR5357000019980817154245
County / counties: Merced, Stanislaus
Regional Water Board: Regional Board 5 - Central Valley Region
Waterbody type: River & Stream
Condition category: Category 5 — 303(d) listed, TMDL required
Integrated Report cycle: 2026

303(d) listings (6)

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
BifenthrinPesticides	158891	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Cyhalothrin, LambdaPesticides	158897	List on 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
MercuryMetals	165420	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Oxygen, DissolvedNutrients	158882	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
Temperature, waterOther Cause	158886	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low
ToxicityTotal Toxics	158887	Do Not Delist from 303(d) list (TMDL required list)	Revised	5A — TMDL still required	—	Low

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, 10:57 PM UTC
Waterbody ID: CAR5357000019980817154245
CALWNUM: 53550000
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: 55.37 Miles

Derived facility associations

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

Derived

CMI Merced SG HMA

Merced · Notice of Non-Applicability · 0.22 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Santa Fe Aggregates Inc Snelling Plant

Snelling · Notice of Intent · 0.60 km away

derived_receiving_water

Derived by California Stormwater Intelligence

Santa Fe Aggregates-Winton

Winton · Notice of Non-Applicability · 0.55 km away

derived_receiving_water

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.