Martis Creek Reservoir: toxic algae advisories
Martis Creek Reservoir, Nevada County. See all Nevada County waters.
What the state's records say
The state's latest record, from Sep 25, 2026, 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 Martis Creek Reservoir
The state's latest record, from Sep 25, 2026, recommends no advisory. For Martis Creek Reservoir, 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 |
|---|---|
| Tahoe-Truckee Airport | The state's latest record, from Sep 25, 2026, recommends no advisory. |
| Cove Across from Kiosk | The state's latest record, from Sep 30, 2022, recommends no advisory. |
| Martis Creek Reservoir | The state's latest record, from Jun 11, 2021, recommends no advisory. |
Advisory history
Every advisory record the state has published for Martis Creek 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 25, 2026 | Tahoe-Truckee Airport | None | Testing results below posting triggers |
| Sep 30, 2022 | Cove Across from Kiosk | None | Testing results below posting triggers |
| Aug 24, 2022 | Cove Across from Kiosk | None | Testing results below posting triggers |
| Jul 5, 2022 | Cove Across from Kiosk | None | Testing results below posting triggers |
| Jun 11, 2021 | Martis Creek Reservoir | None | Testing results below posting triggers |
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.