Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3400-B22
Where
Water Body Cayuga Lake
Latitude and Longitude 42.76613, -76.7366
Segment Open Water 3: Cayuga Lake Mid-South
County Cayuga
Extent Widespread
When
Bloom Reported October 27, 2025 10:00 AM
Bloom Sampled
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 reported: Observed from the MV Teal as we were riding north to store the boat for the winter in Cayuga. We encountered the bloom in the middle of the lake for about a half mile or so. It may have been more widespread, but we traveled through it in a few minutes. Then we were out of it. Extensive area covered, lots of algal green streaks.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp