Four Island Lake: toxic algae advisories
Four Island Lake, Kern County. See all Kern County waters.
What the state's records say
Caution advisory, last posted Aug 8, 2022. 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 Four Island Lake
The state has an advisory on file for Four Island Lake (Caution advisory), last posted Aug 8, 2022, 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.
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 |
|---|---|
| Bear Valley springs | The state's latest record, from Feb 4, 2026, recommends no advisory. |
| Bear Valley springs | The state's latest record, from Feb 6, 2025, recommends no advisory. |
| Bear Valley Springs | The state's latest record, from Jul 12, 2023, recommends no advisory. |
| Bear Valley Springs | The state's latest record, from Sep 2, 2022, recommends no advisory. |
| Bear Valley Springs | Caution advisory, last posted Aug 8, 2022. No all-clear recorded. |
| Bear Valley Springs | Caution advisory, last posted Jul 27, 2022. No all-clear recorded. |
| Four Island Lake Bear Valley Springs | Reports on file, with no advisory level the state has classified. |
| Four Island Lake (Bear Valley Springs) | The state's latest record, from Oct 2, 2020, recommends no advisory. |
Advisory history
Every advisory record the state has published for Four Island 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 |
|---|---|---|---|
| Feb 4, 2026 | Bear Valley springs | None | Updates from routine monitoring program-organization; Visual monitoring only-absent bloom |
| Nov 5, 2025 | Bear Valley springs | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Feb 6, 2025 | Bear Valley springs | None | Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Dec 24, 2024 | Bear Valley springs | Visual observation | Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Nov 26, 2024 | Bear Valley springs | Visual observation | Updates from routine monitoring program-organization; Visual monitoring only-present bloom |
| Jul 12, 2023 | Bear Valley Springs | None | Advisory based on visual and toxins |
| Jul 12, 2023 | Bear Valley Springs | None | Advisory based on visual and toxins |
| May 26, 2023 | Bear Valley Springs | General awareness | Updates from routine monitoring program-organization |
| May 26, 2023 | Bear Valley Springs | General awareness | Updates from routine monitoring program-organization |
| Sep 2, 2022 | Bear Valley Springs | None | No cyano bloom w/testing; Updates from routine monitoring program-organization |
| Aug 8, 2022 | Bear Valley Springs | Caution | Updates from routine monitoring program-organization |
| Jul 27, 2022 | Bear Valley Springs | Caution | Suspected bloom, investigation ongoing |
| Jun 27, 2022 | Bear Valley Springs | Caution | Updates from routine monitoring program-organization |
| Jun 7, 2022 | Bear Valley Springs | Caution | Updates from routine monitoring program-organization |
| Jun 30, 2021 | Four Island Lake Bear Valley Springs | NA - refer to Report Details | Suspected bloom, investigation ongoing |
| Oct 2, 2020 | Four Island Lake (Bear Valley Springs) | None | De-posting advisory. |
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.