Tinemaha Reservoir: toxic algae advisories
Tinemaha Reservoir, Inyo County. See all Inyo County waters.
What the state's records say
Visual observation, last posted Sep 3, 2025. 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: The state recorded an advisory of a type outside the Caution, Warning and Danger levels. Read the sign posted at the water.
Before you go, check the state's official algae page and any signs posted at the water.
Dogs at Tinemaha Reservoir
The state has an advisory on file for Tinemaha Reservoir (Visual observation), last posted Sep 3, 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)
Week ending Jun 6, 2026: about 590,000 cells/mL of cyanobacteria near the center of Tinemaha Reservoir.
A satellite estimate from EPA CyAN for a 2.7 km² lake. It does not measure toxins and does not change the advisory status.
| Week ending | Estimate |
|---|---|
| Jun 6, 2026 | about 590,000 cells/mL |
| May 30, 2026 | about 670,000 cells/mL |
| May 23, 2026 | about 220,000 cells/mL |
| May 16, 2026 | about 640,000 cells/mL |
| May 2, 2026 | about 16,000 cells/mL |
| Feb 21, 2026 | about 13,000 cells/mL |
| Sep 13, 2025 | about 92,000 cells/mL |
| Sep 6, 2025 | about 370,000 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 |
|---|---|
| Big Pine, CA | Visual observation, last posted Sep 3, 2025. No all-clear recorded. |
Advisory history
Every advisory record the state has published for Tinemaha Reservoir, 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 |
|---|---|---|---|
| Sep 3, 2025 | Big Pine, CA | Visual observation | Visual monitoring only-present bloom |
| Jun 3, 2025 | Big Pine, CA | Visual observation | Visual monitoring only-present bloom |
| Aug 16, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Aug 13, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Aug 13, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Aug 13, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Jul 25, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Jul 25, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Jul 25, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
| Jul 24, 2024 | Big Pine, CA | Caution | Visual monitoring only-present bloom |
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.