H.V. Eastman Lake: toxic algae advisories
H.V. Eastman Lake, Madera County. See all Madera County waters.
What the state's records say
Danger advisory, last posted Aug 25, 2026. No all-clear recorded.
12 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: Toxins may be at levels that can seriously harm people and animals. Stay out of the water and keep children and pets away from the water and the shore.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at H.V. Eastman Lake
The state has an advisory on file for H.V. Eastman Lake (Danger advisory), last posted Aug 25, 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 2,300,000 cells/mL of cyanobacteria near the center of H. V. Eastman Lake.
A satellite estimate from EPA CyAN for a 4.2 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Oct 17, 2026 | about 2,300,000 cells/mL |
| Oct 10, 2026 | about 4,400,000 cells/mL |
| Oct 3, 2026 | about 3,100,000 cells/mL |
| Sep 26, 2026 | about 4,400,000 cells/mL |
| Sep 19, 2026 | about 2,000,000 cells/mL |
| Sep 12, 2026 | about 2,700,000 cells/mL |
| Sep 5, 2026 | about 1,500,000 cells/mL |
| Aug 29, 2026 | about 2,600,000 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 |
|---|---|
| at west boat ramp 2 (539MAD420) | Danger advisory, last posted Aug 25, 2026. No all-clear recorded. |
| at east boat ramp 1 (539MAD400) | Danger advisory, last posted Aug 25, 2026. No all-clear recorded. |
| north of dam | Caution advisory, last posted Apr 2, 2026. No all-clear recorded. |
| East Boat Ramp | Caution advisory, last posted May 11, 2023. No all-clear recorded. |
| east boat ramp 1 (539MAD400) | Danger advisory, last posted Dec 16, 2022. No all-clear recorded. |
| west boat ramp 2 (539MAD420) | Warning advisory, last posted Dec 16, 2022. No all-clear recorded. |
| East Boat Ramp 1 (539MAD400) | Caution advisory, last posted Jul 15, 2021. No all-clear recorded. |
| east boar ramp 1 | Caution advisory, last posted Jun 25, 2021. No all-clear recorded. |
| boat ramp west 2 | Caution advisory, last posted Jun 25, 2021. No all-clear recorded. |
| H.V. Eastman Lake, west boat ramp | Caution advisory, last posted Sep 2, 2020. No all-clear recorded. |
| H.V. Eastman Lake | Caution advisory, last posted Aug 22, 2019. No all-clear recorded. |
| H.V. Eastman Lake | Caution advisory, last posted Dec 21, 2018. No all-clear recorded. |
Advisory history
Every advisory record the state has published for H.V. Eastman 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 |
|---|---|---|---|
| Aug 25, 2026 | at west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Alert-detached mats observed; Alert-scum observed |
| Aug 25, 2026 | at east boat ramp 1 (539MAD400) | Danger | Advisory based on visual and toxins |
| Aug 25, 2026 | at east boat ramp 1 (539MAD400) | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Aug 18, 2026 | at west boat ramp 2 (539MAD420) | Caution | visual monitoring based advisory |
| Aug 18, 2026 | at east boat ramp 1 (539MAD400) | Caution | visual monitoring based advisory |
| Jun 24, 2026 | at west boat ramp 2 (539MAD420) | Caution | Advisory due to historical data.; Testing results below posting triggers |
| Jun 24, 2026 | at west boat ramp 2 (539MAD420) | Danger | Advisory due to historical data.; Testing results below posting triggers |
| Jun 24, 2026 | at east boat ramp 1 (539MAD400) | Caution | Advisory due to historical data.; Testing results below posting triggers |
| May 11, 2026 | at west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| May 11, 2026 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| May 5, 2026 | at west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| May 5, 2026 | at east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Apr 2, 2026 | north of dam | Caution | visual monitoring based advisory |
| Oct 28, 2025 | at west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Oct 28, 2025 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Oct 20, 2025 | at east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Oct 20, 2025 | at west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization; visual monitoring based advisory |
| Aug 19, 2025 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 19, 2025 | at west boat ramp 2 (539MAD420) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Aug 11, 2025 | at east boat ramp 1 (539MAD400) | Visual observation | Suspected bloom, investigation ongoing |
| Aug 11, 2025 | at west boat ramp 2 (539MAD420) | Visual observation | Suspected bloom, investigation ongoing |
| Jun 24, 2025 | at east boat ramp 1 (539MAD400) | Visual observation | Suspected bloom, investigation ongoing |
| Jun 24, 2025 | at west boat ramp 2 (539MAD420) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jun 24, 2025 | at east boat ramp 1 (539MAD400) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 15, 2025 | at west boat ramp 2 (539MAD420) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| May 15, 2025 | at east boat ramp 1 (539MAD400) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 27, 2024 | at east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Aug 27, 2024 | at west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Jun 25, 2024 | at west boat ramp 2 (539MAD420) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jun 25, 2024 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| May 17, 2024 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 17, 2024 | at west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 17, 2024 | at west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| May 17, 2024 | at east boat ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins; Lake-wide advisory; Updates from routine monitoring program-organization |
| Aug 24, 2023 | at west boat ramp 2 (539MAD420) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Aug 24, 2023 | at east boat ramp 1 (539MAD400) | None | Testing results below posting triggers; Updates from routine monitoring program-organization |
| Jul 6, 2023 | at west boat ramp 2 (539MAD420) | None | Updates from routine monitoring program-organization |
| Jul 6, 2023 | at east boat ramp 1 (539MAD400) | None | Updates from routine monitoring program-organization |
| Jun 22, 2023 | at east boat ramp 1 (539MAD400) | Caution | Floating/planktonic bloom observed; Lake-wide advisory |
| Jun 22, 2023 | at west boat ramp 2 (539MAD420) | Caution | Floating/planktonic bloom observed; Lake-wide advisory |
| May 23, 2023 | at west boat ramp 2 (539MAD420) | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| May 23, 2023 | at east boat ramp 1 (539MAD400) | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| May 11, 2023 | at east boat ramp 1 (539MAD400) | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| May 11, 2023 | at west boat ramp 2 (539MAD420) | Caution | Floating/planktonic bloom observed; visual monitoring based advisory |
| May 11, 2023 | East Boat Ramp | Caution | Floating/planktonic bloom observed |
| Jan 1, 2023 | at west boat ramp 2 (539MAD420) | Warning | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Jan 1, 2023 | at east boat ramp 1 (539MAD400) | Danger | Advisory based on visual and toxins; Updates from routine monitoring program-organization |
| Dec 16, 2022 | east boat ramp 1 (539MAD400) | Danger | Updates from routine monitoring program-organization |
| Dec 16, 2022 | west boat ramp 2 (539MAD420) | Warning | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Nov 16, 2022 | west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Nov 16, 2022 | east boat ramp 1 (539MAD400) | Danger | Updates from routine monitoring program-organization |
| Nov 14, 2022 | east boat ramp 1 (539MAD400) | Danger | Updates from routine monitoring program-organization |
| Nov 14, 2022 | west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Nov 9, 2022 | west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Nov 9, 2022 | east boat ramp 1 (539MAD400) | Danger | Updates from routine monitoring program-organization |
| Oct 10, 2022 | west boat ramp 2 (539MAD420) | Danger | Advisory based on visual and toxins; Alert-high concentration toxins; Alert-scum observed |
| Oct 5, 2022 | west boat ramp 2 (539MAD420) | Warning | Advisory based on visual and toxins |
| Sep 27, 2022 | west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins |
| Sep 27, 2022 | east boat ramp 1 (539MAD400) | Warning | Updates from routine monitoring program-organization |
| Sep 27, 2022 | west boat ramp 2 (539MAD420) | None | Advisory based on visual and toxins |
| Sep 2, 2022 | west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins |
| Sep 2, 2022 | east boat ramp 1 (539MAD400) | Warning | Updates from routine monitoring program-organization |
| Aug 30, 2022 | west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins |
| Aug 30, 2022 | east boat ramp 1 (539MAD400) | Warning | Updates from routine monitoring program-organization |
| Aug 25, 2022 | west boat ramp 2 (539MAD420) | Caution | Advisory based on visual and toxins |
| Aug 25, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Aug 18, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Aug 18, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Aug 5, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Aug 5, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Aug 3, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Aug 3, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Jul 21, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Jul 7, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Jul 7, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Jun 22, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Jun 22, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Jun 22, 2022 | west boat ramp 2 (539MAD420) | None | Updates from routine monitoring program-organization |
| Jun 22, 2022 | east boat ramp 1 (539MAD400) | None | Updates from routine monitoring program-organization |
| Jun 1, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Jun 1, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| May 26, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| May 26, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Apr 1, 2022 | west boat ramp 2 (539MAD420) | Caution | Updates from routine monitoring program-organization |
| Apr 1, 2022 | east boat ramp 1 (539MAD400) | Caution | Updates from routine monitoring program-organization |
| Jul 15, 2021 | East Boat Ramp 1 (539MAD400) | Caution | Advisory based on visual and toxins |
| Jun 25, 2021 | east boar ramp 1 | Caution | Advisory based on visual and toxins |
| Jun 25, 2021 | boat ramp west 2 | Caution | Advisory based on visual and toxins |
| Sep 2, 2020 | H.V. Eastman Lake, west boat ramp | Caution | Advisory based on visual and toxins |
| Aug 22, 2019 | H.V. Eastman Lake | Caution | |
| Dec 21, 2018 | H.V. Eastman Lake | Caution |
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.