Jamesville Beach closes due to harmful algal blooms during heat wave
Jamesville Beach closed for swimming as a harmful algal bloom hit during a heat wave, and Onondaga County sent families to Oneida Shores Park instead.
A harmful algal bloom closed Jamesville Beach for swimming on July 6, cutting off one of Onondaga County families’ easiest places to cool off during a stretch of brutal heat. Onondaga County Parks pointed swimmers to Oneida Shores Park in Brewerton instead, giving parents, kids and older residents another place to get in the water.
The county’s health guidance says harmful algal blooms can turn water green and leave thick scums on the surface. Some blooms can release toxins that may cause skin or eye irritation, and if people or animals swallow the water, diarrhea or vomiting can follow. The county advises people and pets to stay out of any water where a bloom is present.
The closure followed the county’s standard process for a visual bloom: officials shut the swimming area first, then collect water samples before reopening to confirm there are no toxins. County notices say that even when the beach is closed for swimming, the rest of Jamesville Beach Park can remain open during normal hours. That keeps the closure focused on the water, not the entire park.
Jamesville Beach has now been closed repeatedly for the same problem. County health notices show closures on July 14, 2023; July 29, 2024, when Gillie Lake was also closed for a visual algal bloom; and July 10, 2025, when Jamesville Beach was again taken out of service for swimming. The county later reopened the beach in 2025 after water-sample results showed the bloom had subsided, a reminder that these shutdowns can last long enough for weather, sampling and water conditions to change.
For Onondaga County residents trying to make summer plans, the practical answer right now is Oneida Shores Park in Brewerton. County beach testing happens about every two weeks during the summer, so the same shoreline that looks safe on a hot afternoon can be closed by evening if water quality changes. That leaves families dependent on county updates, and on whatever open water the county can still offer when the heat is at its worst.
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