When submitting eBird observations at Tomhannock Reservoir, it is most helpful to start a new checklist for each hotspot around the reservoir. Use the general hotspot when you have a checklist that includes multiple locations or if no other hotspot or personal location is appropriate for your sightings.

The Tomhannock Reservoir was created in 1900 by damming the Tomhannock Creek, a tributary of the Hudson River. The reservoir serves as the primary source of drinking water for the city of Troy and several nearby communities. 

Tomhannock Reservoir is the largest freshwater body in Rensselaer County, New York. The lake is approximately 1,720 acres in size. This reservoir is especially good to check for waterfowl during autumn migration.