Lower Blue Lake: toxic algae advisories
Lower Blue Lake, Lake County. See all Lake County waters.
What the state's records say
The state's latest record, from Oct 17, 2024, recommends no advisory.
That reflects what the state knew on that date. It is not a finding that the water is safe now: blooms can return within days, and many are never reported.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Lower Blue Lake
The state's latest record, from Oct 17, 2024, recommends no advisory. For Lower Blue Lake, that is not the same as an all-clear for today. Look at the water before your dog goes in: keep it out of green, blue-green or scummy water and away from mats on the shore.
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 |
|---|---|
| northern end | The state's latest record, from Oct 17, 2024, recommends no advisory. |
| near Highway 20 | Reports on file, with no advisory level the state has classified. |
| Lower Blue Lake | The state's latest record, from Sep 11, 2017, recommends no advisory. |
Advisory history
Every advisory record the state has published for Lower Blue 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 17, 2024 | northern end | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 27, 2024 | northern end | None | Updates from routine monitoring program-organization |
| Jun 20, 2024 | northern end | None | Updates from routine monitoring program-organization |
| Jun 22, 2021 | near Highway 20 | NA - refer to Report Details | Under investigation |
| Sep 11, 2017 | Lower Blue 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.