Lake Davis: toxic algae advisories
Lake Davis, Plumas County. See all Plumas County waters.
What the state's records say
Caution advisory, last posted Oct 10, 2025. No all-clear recorded.
2 reported spots here have an advisory with no all-clear recorded.
Reporting is voluntary, so the state may not have recorded an end even if conditions changed. Check posted signs and the official map.
What this level asks: Algae that can make toxins may be present. Keep people, children and pets away from algae and scum, and do not let pets drink the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Lake Davis
The state has an advisory on file for Lake Davis (Caution advisory), last posted Oct 10, 2025, and no all-clear recorded. Keep your dog out of the water and away from scum on the shore until the state records an end.
Satellite estimate (not an advisory)
No satellite reading on file for Lake Davis in recent weeks. Clouds, ice, or a lake shape the satellite's estimate near its center misses can cause this. It is a gap in the data, not a reading.
This is a satellite estimate from the U.S. EPA's Cyanobacteria Assessment Network, not an advisory. It estimates how much cyanobacteria is in the water near the lake's center, not whether toxins are present: a high number does not mean toxins, and a low one does not mean there are none. It covers lakes of about 1 square kilometer and larger, so small ponds, dog parks and most rivers are not covered, and clouds can hide a lake for weeks. It never changes the advisory status above.
Satellite estimates: U.S. EPA Cyanobacteria Assessment Network (CyAN), from Copernicus Sentinel-3 data. Provisional, research-level estimates; EPA does not endorse this site. Checked Oct 22, 2026.
Reported spots
The state records each report at a spot, such as a beach or a boat ramp. Each spot's latest deciding record:
| Spot | Status |
|---|---|
| southern lake off Lake Davis Rd | Caution advisory, last posted Oct 10, 2025. No all-clear recorded. |
| southern lake near Lake Davis trail marker | Caution advisory, last posted Oct 10, 2025. No all-clear recorded. |
| Jenkins point | The state's latest record, from Nov 10, 2022, recommends no advisory. |
| Lake Davis | The state's latest record, from Oct 9, 2020, recommends no advisory. |
Advisory history
Every advisory record the state has published for Lake Davis, newest first. "None" is the state's record that no advisory was recommended on that date. "NA" records do not change a status.
| Date | Spot | State's level | Notes |
|---|---|---|---|
| Oct 10, 2025 | southern lake off Lake Davis Rd | Caution | visual monitoring based advisory |
| Oct 10, 2025 | southern lake near Lake Davis trail marker | Caution | visual monitoring based advisory |
| Oct 10, 2025 | southern lake near Lake Davis trail marker | Caution | Visual monitoring only-present bloom |
| Oct 10, 2025 | southern lake off Lake Davis Rd | Caution | Visual monitoring only-present bloom |
| Oct 6, 2025 | southern lake off Lake Davis Rd | NA - refer to Report Details | Under investigation |
| Nov 10, 2022 | Jenkins point | None | End date recorded: Nov 10, 2022. De-posting advisory. |
| Sep 9, 2022 | Jenkins point | Caution | Floating/planktonic bloom observed; Lake-wide advisory |
| Sep 9, 2022 | Jenkins point | NA - refer to Report Details | Suspected bloom, investigation ongoing |
| Oct 9, 2020 | Lake Davis | None |
Source
Advisory data: California State Water Resources Control Board, Freshwater Harmful Algal Bloom Program, via data.ca.gov (public domain). Advisories are recommendations; reporting is voluntary and incomplete. The state's data. An advisory ends only when the state records a later "None" (no advisory recommended) at the same spot, or an end date. A blank end date is unknown.