Batavia Kill is a 21-mile-long (34 km) tributary of Schoharie Creek, that flows across the towns of Windham, Ashland and Prattsville in the U.S. state of New York.

The kill continues northwest and gains an unnamed tributary draining the southwest slopes of Acra Point.

Batavia Kill then curves to the southwest, crosses under New York State Route 23A, then converges with Schoharie Creek southeast of the hamlet of Prattsville.

Mixed grass and shrubs is the second most common land cover, with just over 1 percent being impervious surfaces and agricultural uses.

Fish and Wildlife Service has designated 1.9 percent, or 902 acres (1.409 sq mi), of the watershed as wetlands.

Geological evidence within the area show that the Batavia Kill watershed was influenced by ice from four or more different directions.

As the glaciers retreated, the Schoharie Valley was blocked by stalled ice near Grand Gorge, which developed a large lake.

Roughly 91 percent of the soils covering the bedrock within the Batavia Kill watershed have mostly moderate to very poor permeability.

The type of soils in the watershed are very prone to erosion, which contributes to excess sediment to enter into the stream system.

[4] The United States Geological Survey (USGS) maintains one stream gauge along Batavia Kill in operation since 1997.

[9] In late August 2011, Tropical Storm Irene caused extensive flooding and devastation in the eastern New York.

The agency also adds a "(TS)" to the upper and sections of the middle, indicating that the stream's waters are ideal for trout spawning.

From there they go to Ashokan Reservoir, which supplies 10 percent of the city's water, and then, via the Catskill Aqueduct, to customers, without requiring filtration.

Another was built in 1970 and is located on the Lake Heloise outlet, approximately one mile north of its confluence with the Batavia.

The CD Lane Park Dam was constructed in 1974 and is located approximately 3.5 miles (5.6 km) upstream of Hensonville.

Each dam is made of an earth embankment, a low level outlet pipe, and an emergency grass spillway.

Also in 1999, a 3,600 feet (1,100 m) section of the creek behind the Brandywine restaurant in Ashland was restored, both just before Tropical Storm Floyd effected the watershed.

These projects included adding rock structures and planting native vegetation on the streambanks and floodplains to reduce erosion.

[15][16] The areas of greatest concern for flooding were the reach of the stream around the hamlets of Maplecrest, Hensonville, and Windham.

Also the GCSWCD assisted the WFP in 2000, and the two agencies purchased a 20-foot-long (6.1 m) temporary bridge, which is available on a loan basis for logging operations at no cost.