Harmful Algal Bloom (HAB) Event Information
Bloom Code 25-3441-B4
Where
Water Body Cayuga Lake
Latitude and Longitude 42.66586, -76.69919
Segment Lakeshore Segment Southwest 10: Lively Run to Sheldrake Point
County Seneca
Extent Large Localized
When
Bloom Reported October 17, 2025 03:30 PM
Bloom Sampled October 17, 2025 05:00 PM
Microscopic Examination
What
Bloom Genera [1]
Microscopy Present Dominant

Bloom Chemistry
Total Microcystin and Nodularins (EPA 546) [2] 20720.0 ug/L
[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

2025 PRIORITY SITE, Zone #3441: Sheldrake Point- identified by Seneca County Health Department as a sample-collection site. Volunteer reported: Brisk wind from Northeast, sunny day 58degrees. The bloom extended for about 20 feet on the shoreline then appeared about 25 feet from the shore with less intensity.

Weather
Weather
Wind speed
Wind direction
Water Temp
Air Temp