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California / Waters /

Trinity River

River in California, past Big Bar, Douglas City, Helena, Lewiston, Trinity Village, Weaverville and Willow Creek

Current status

No current status shown

No current status is assigned to this water outline. Check the water page for reports and any estimated downstream stretches. Why this status, and its source

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Square boat markers mark boat launches listed by OpenBoatLaunch.

Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

No current status shown: no report we track sets a status on this water now; how statuses work. No status does not mean the water is safe. Follow posted signs and local health advice.

Sources checked: Surface Water - Freshwater Harmful Algal Blooms (last successful check 2026-11-06 08:37 UTC). Status by DirtyWaterWatch, updated 2026-11-06 09:03 UTC. · Updated

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: a status resting on a source that could not be checked on schedule.

No discharge, advisory or caution periods are shown for this water in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-06 09:03 UTC.

Reported discharges over time

Historical charts are not available here. See the reports and sources on this page.

Reports linked to Trinity River

Cyanobacteria (harmful blue-green algae) can make water unfit for contact; the issuing authority decides when its advisory ends.

Reports linked to Trinity River, newest first
WhenReportStatus
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · below Junction City · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · below Coopers Bar · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · above North Fork Confluence · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at Pigeon Point · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · above Big Flat · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Skunk Point · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at Shasta-Trinity Picnic Area · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Prairie Creek Road · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Little French Creek · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Del Loma · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at Tonys Point · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Swede Creek · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Sandy Bar Creek · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · along Highway 299 · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Cedar Flat · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Trinity Village · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Francis B. Matthews Rest Area · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · near Sheridan Creek · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · south of hwy 299 west bank · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at hwy 299 east bank · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at Marin Rd · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · east of south fork · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · at Hwy 299 crossing · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · Dam · Algae advisory · volume not reported report · notice · maplifted
to Dec 31 ’21California State Water Resources Control Board (FHAB program) · right past town of willow creek going east off highway; river access sign, pull out left side of the highway and trail down · Algae advisory · volume not reported report · notice · maplifted

Sources: Surface Water - Freshwater Harmful Algal Blooms, retrieved 2026-11-06 03:07 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

Showing the latest 25 records of 26 records.See them all with filters.

All reports in California by year: 2021 (25 here) · 2020 (1 here)

Wastewater outlets on this water

Outfall: a pipe or outlet where wastewater enters a water body.

No wastewater outlet in our records is linked to this water.

Boat launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, Open Database License). · Trinity River on OpenBoatLaunch

Nearby waters

Sources covering this water

26 records linked to this water. Updated .