Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3430-B3
Where
Water Body Cayuga Lake
Latitude and Longitude 42.473657, -76.530272
Segment Lakeshore Segment Southwest 2: Cass Park to Glenwood Point
County Tompkins
Extent Widespread
When
Bloom Reported August 23, 2025 03:25 PM
Bloom Sampled August 23, 2025 03:25 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: The HAB seemed to be spread all along west shore in my area. Sunny, calm water with gentle north breeze, air temp mid 70s F. I noticed earlier in the afternoon that a bloom seemed to be forming, and when I checked back later it was indeed evident with direct sunlight; however, bloom is "light", that is not clearly concentrated but only consisting of light streaks of cyanobacteria on the surface.

Weather
Weather Sunny
Wind speed
Wind direction
Water Temp
Air Temp