Eagle Lake: toxic algae advisories
Eagle Lake, Lassen County. See all Lassen County waters.
What the state's records say
Caution advisory, last posted Oct 7, 2026. No all-clear recorded.
6 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 Eagle Lake
The state has an advisory on file for Eagle Lake (Caution advisory), last posted Oct 7, 2026, 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)
Week ending Oct 17, 2026: about 1,100,000 cells/mL of cyanobacteria near the center of Eagle Lake.
A satellite estimate from EPA CyAN for a 73.6 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 17, 2026 | about 1,100,000 cells/mL |
| Aug 29, 2026 | about 730,000 cells/mL |
| Aug 22, 2026 | about 120,000 cells/mL |
| Aug 15, 2026 | about 90,000 cells/mL |
| Jul 4, 2026 | about 470,000 cells/mL |
| Jun 27, 2026 | about 54,000 cells/mL |
| May 9, 2026 | about 190,000 cells/mL |
| May 2, 2026 | about 150,000 cells/mL |
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 |
|---|---|
| Christie Day Use | Caution advisory, last posted Oct 7, 2026. No all-clear recorded. |
| Merrill Campground | Caution advisory, last posted Oct 7, 2026. No all-clear recorded. |
| Youth Camp | Visual observation, last posted Jul 23, 2026. No all-clear recorded. |
| Spaulding Boat Ramp | The state's latest record, from Oct 9, 2024, recommends no advisory. |
| Gallatin Beach | Caution advisory, last posted Aug 12, 2024. No all-clear recorded. |
| Christie Day Use | The state's latest record, from Aug 16, 2022, recommends no advisory. |
| Wildcat Point | The state's latest record, from Aug 30, 2021, recommends no advisory. |
| Spot not described | The state's latest record, from Jul 1, 2021, recommends no advisory. |
| Eagle Lake, Gallatan near Ronald McDonald House | Caution advisory, last posted Nov 29, 2020. No all-clear recorded. |
| Eagle Lake, Christie Day Use North | Caution advisory, last posted Sep 3, 2020. No all-clear recorded. |
| Eagle Lake (south lake) | The state's latest record, from Aug 31, 2018, recommends no advisory. |
Advisory history
Every advisory record the state has published for Eagle Lake, 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 7, 2026 | Christie Day Use | Caution | Advisory based on visual and toxins |
| Oct 7, 2026 | Merrill Campground | Caution | Advisory based on visual and toxins |
| Oct 7, 2026 | Christie Day Use | Caution | Testing results below posting triggers |
| Aug 28, 2026 | Merrill Campground | Visual observation | Testing results below posting triggers |
| Aug 28, 2026 | Merrill Campground | Visual observation | Testing results below posting triggers |
| Aug 28, 2026 | Christie Day Use | Visual observation | Testing results below posting triggers |
| Aug 28, 2026 | Merrill Campground | Visual observation | Testing results below posting triggers |
| Jul 23, 2026 | Youth Camp | Visual observation | Under investigation |
| Jun 30, 2026 | Merrill Campground | Visual observation | Testing results below posting triggers |
| Jun 30, 2026 | Christie Day Use | Visual observation | Testing results below posting triggers |
| Jun 30, 2025 | Merrill Campground | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 30, 2025 | Christie Day Use | Caution | Testing results below posting triggers |
| Oct 9, 2024 | Spaulding Boat Ramp | None | Testing results below posting triggers |
| Oct 9, 2024 | Christie Day Use | None | Testing results below posting triggers |
| Aug 12, 2024 | Gallatin Beach | Caution | Suspected bloom, investigation ongoing; Under investigation |
| Jul 5, 2023 | Merrill Campground | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jul 5, 2023 | Christie Day Use | None | Updates from routine monitoring program-organization |
| Jul 5, 2023 | Merrill Campground | None | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| May 25, 2023 | Merrill Campground | None | Advisory based on visual and toxins |
| May 25, 2023 | Merrill Campground | NA - refer to Report Details | Suspected bloom, investigation ongoing |
| Aug 24, 2022 | Merrill Campground | Caution | Advisory based on visual and toxins |
| Aug 16, 2022 | Christie Day Use | None | Testing results below posting triggers |
| Aug 16, 2022 | Christie Day Use | Caution | visual monitoring based advisory |
| Aug 16, 2022 | Merrill Campground | Caution | visual monitoring based advisory |
| Jul 20, 2022 | Merrill Campground | Caution | Advisory based on visual and toxins |
| Jun 14, 2022 | Christie Day Use | None | Testing results below posting triggers |
| Jun 14, 2022 | Merrill Campground | None | No cyano bloom w/testing |
| Jun 14, 2022 | Christie Day Use | Caution | visual monitoring based advisory |
| Jun 14, 2022 | Merrill Campground | Caution | visual monitoring based advisory |
| May 20, 2022 | Christie Day Use | None | No cyano bloom w/testing |
| May 20, 2022 | Merrill Campground | None | No cyano bloom w/testing |
| Aug 30, 2021 | Wildcat Point | None | Testing results below posting triggers |
| Jul 1, 2021 | Spot not described | None | Testing results below posting triggers |
| Nov 29, 2020 | Eagle Lake, Gallatan near Ronald McDonald House | Caution | Advisory based on visual and toxins |
| Sep 3, 2020 | Eagle Lake, Christie Day Use North | Caution | Advisory based on visual and toxins |
| Aug 31, 2018 | Eagle Lake (south lake) | 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.