Richardson Bay: toxic algae advisories
Richardson Bay, Marin County. See all Marin County waters.
What the state's records say
Caution advisory, last posted Jul 31, 2023. 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 Richardson Bay
The state has an advisory on file for Richardson Bay (Caution advisory), last posted Jul 31, 2023, 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 |
|---|---|
| Sausalito Yacht Harbor | Visual observation, last posted Jul 31, 2023. No all-clear recorded. |
| Waldo Point Harbor at Issaquah dock | Caution advisory, last posted May 24, 2023. No all-clear recorded. |
| Richardson Bay, at Coyote Creek outlet | The state's latest record, from May 16, 2017, recommends no advisory. |
Advisory history
Every advisory record the state has published for Richardson Bay, 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 |
|---|---|---|---|
| Jul 31, 2023 | Sausalito Yacht Harbor | NA - refer to Report Details | Marine bloom suspected (red tide) |
| Jul 31, 2023 | Sausalito Yacht Harbor | Visual observation | Marine bloom present (red tide) |
| Jul 31, 2023 | Sausalito Yacht Harbor | NA - refer to Report Details | Marine bloom present (red tide); Under investigation |
| Jul 31, 2023 | Sausalito Yacht Harbor | NA - refer to Report Details | Marine bloom suspected (red tide); Under investigation |
| May 24, 2023 | Waldo Point Harbor at Issaquah dock | Blank in the state's file | visual monitoring based advisory |
| May 24, 2023 | Waldo Point Harbor at Issaquah dock | Caution | visual monitoring based advisory |
| May 24, 2023 | Waldo Point Harbor at Issaquah dock | Blank in the state's file | visual monitoring based advisory |
| May 16, 2017 | Richardson Bay, at Coyote Creek outlet | 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.