Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3400-B20
Where
Water Body Cayuga Lake
Latitude and Longitude 42.8524, -76.71085
Segment Open Water 2: Cayuga Lake Mid-North
County Cayuga
Extent Widespread
When
Bloom Reported October 06, 2025 05:30 PM
Bloom Sampled October 06, 2025 05:30 PM
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

Volunteer Reports: Open Water HAB; SW wind during the day creating some foam streamers. Wind stopped, hot and sunny. Worst HABs we have ever seen. Very thick. Stayed mainly on Cayuga side of the channel. My actual shoreline was clear for 10’ and we noticed slight HABs from our dock. The further from shore we got, the thicker it became. Worst yet! Still bad when we returned at 6:45.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp