California
Toxic algae in San Joaquin County lakes
21 lakes and waterways in San Joaquin County have harmful algal bloom reports in California's official data. The most recent entry is for Smith Canal: There are no bloom reports for Smith Canal in the last 30 days of California's data. The most recent was a bloom report on 28 June 2025 at Louis Park boat ramp. Smith Canal, San Joaquin River and White Slough and 7 more have had blooms in three or more years.
Lakes with bloom history
Newest report first. Each lake has its own page with the full history and what the results mean.
- Smith Canal Bloom reported
- Brookside Lake Bloom reported
- San Joaquin River Bloom reported
- White Slough Bloom reported
- Old River Bloom reported
- Middle River Bloom reported
- Grant Line Canal Bloom reported
- Victoria Canal Bloom reported
- Oakwood Lake Bloom reported
- McLeod Lake Bloom reported
- Mormon Slough Bloom reported
- Calaveras Creek Caution
- Stockton Deep Water Channel Bloom reported
Other waterbodies with a report
These have one or two reports in a single year, which isn't enough history for a page of their own yet.
- Buckley Cove 2022
- Buckley Ponds 2016
- Fabian And Bell Canal 2016
- Lindsey Slough 2021
- Little Potato Slough 2022
- Lodi Lake 2023
- Manteca Lake 2019
- Other River 2019
Source: California State Water Resources Control Board, official data, checked 24 October 2026. For today's conditions see the California HABs Portal map. No report doesn't mean a lake is safe: most water is only tested occasionally.