Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3488-B3
Where
Water Body Cayuga Lake
Latitude and Longitude 42.47784, -76.53165
Segment Lakeshore Segment Southwest 2: Cass Park to Glenwood Point
County Tompkins
Extent Widespread
When
Bloom Reported October 12, 2025 11:15 AM
Bloom Sampled October 12, 2025 11:15 AM
Microscopic Examination
What
Bloom Genera [1]
Microscopy Present Dominant

Bloom Chemistry
[1] Genera - plural of genus, a category of classification in biology that ranks between the family level and the species level. Because there are many different species of bacteria that are difficult to distinguish, it is more useful to classify bacteria by genus rather than species.
[2] Microcystin
Map of HAB event
Bloom Description

Community member reported: The weather is about 63° and there’s relatively little wind right now. The weather is very mild and it’s sunny. The outbreak that I’m seeing is not super dense but looks like a mild outbreak. It does have the characteristic yellow dots all over the surface of the water. it is drifting southward. There is no weed cutter boat near this area. It is a Sunday morning and things are very quiet. I’m not seeing any fish die off. It looks like it is either a bloom that is just ramping up or one that is fading out.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp