Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3476-B8
Where
Water Body Cayuga Lake
Latitude and Longitude 42.6702192, -76.7112704
Segment Lakeshore Segment Northwest 1: Sheldrake Point to Deans Cove
County Seneca
Extent Large Localized
When
Bloom Reported October 23, 2025 11:00 AM
Bloom Sampled October 23, 2025 11:00 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

Volunteer reported: 51 degrees; wind SW 6 mph. Otherwise lake very clear. Brief rain storm previous night. HAB seems to be especially clumped around leaves in water. HAB still persisting 4 hours after first spotted. *Updated 10/24/25 to add: Volunteer reports the HAB is still present. Air temp ~ 40F.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp