The resulting reservoir consists of a single 6-mile (9.6-km) basin, and holds of water at full capacity, making it one of the smaller New York City reservoirs. Put into service in 1926, the Schoharie Reservoir provides nine million people with approximately 15-16 percent of their annual water supply needs. It is also the smaller of the two reservoirs which, along with the Ashokan Reservoir, in Olive, New York, make up the New York City Catskill Water System. Overflow from the Schoharie Reservoir tops the Gilboa Dam and runs back into Schoharie Creek, ultimately flowing into the Hudson River.