Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3430-B2
Where
Water Body Cayuga Lake
Latitude and Longitude 42.473069, -76.529228
Segment Lakeshore Segment Southwest 2: Cass Park to Glenwood Point
County Tompkins
Extent Large Localized
When
Bloom Reported July 22, 2025 11:50 AM
Bloom Sampled July 22, 2025 11:50 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 reports: Bright sunshine, calm water but slight N breeze developing, air temperature in low 70s F and rising. I repeat that this Bloom is slight but evident on 3 of the 5 properties in zone 3430. Overall, lake surface is green throughout the zone and beyond with cyanobacteria evident while only poorly defined streaks at several places.

Weather
Weather Sunny
Wind speed
Wind direction
Water Temp
Air Temp