Lake Level
1,123.30 FEET
1/2/2026
Full Pool: 1,148.0
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Cannonsville Reservoir News

November 2025 Water Resources Outlook

NWS Southeast River Forecast Center

Date: 11/20/2025

November 2025 review of Southeast Rivers for the past month and an outlook on factors that will impact future streamflows

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October 2025 Water Resources Outlook

NWS Southeast River Forecast Center

Date: 10/20/2025

The Southeast River Forecast Center October 2025 Water Resources Outlook. This outlook reviews recent influences on Southeast US streamflow's and provides an outlook of the coming months streamflow influences

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September 2025 Water Resources Outlook

NWS Southeast River Forecast Center

Date: 9/22/2025

The Southeast River Forecast Center September 2025 Water Resources Outlook. This outlook reviews recent influences on southeast US streamflow's and provides an outlook of the coming months streamflow influences

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What Will the Long July 4 Holiday Weekend Be Like on the Water for Boaters?

BoatUS News

Date: 6/30/2025

TowBoatUS predicts more than 2,500 requests for on-water assistance SPRINGFIELD, Va., June 30, 2025 – When NOAA, The Weather Channel and even the Farmer’s Almanac all agree this summer will be hotter than average, boaters know they will need to prepare for the heat. However, on America’s July 4

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Water Resources Outlook for September 2023

National Weather Service

Date: 9/21/2023

Southeast River Forecast Center Water Resources Outlook for September 2023 addressing flooding and drought issues across the southeast U.S

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• River: West Branch Delaware River
• Volume: 293,478 Acre Feet
• Drainage Area: 455 Square Miles
The Cannonsville Reservoir is a reservoir in the New York City water supply system in Delaware County, New York. It was formed by construction of the Cannonsville Dam on its west end, which empounded over half of the West Branch of the Delaware River. Lying on the western part of the Delaware Watershed, it is the westernmost of New York City's reservoirs. It was placed in service in 1964, and is the most recently constructed New York City-owned reservoir.

The town of Cannonsvile was destroyed to make room for the reservoir, which lies within the towns of Tompkins and Deposit.

Its 455 square miles drainage basin is the largest of all of the NYC reservoirs. Capacity is 95.7 billion US gallons. Water from the reservoir flows into the 44-mile West Delaware Tunnel in Tompkins, New York. Then it flows through the aqueduct into the Rondout Reservoir, before joining the 85-mile Delaware Aqueduct, which provides New York City with about 50% of its drinking water.

The Delaware Aqueduct then crosses beneath the Hudson River and continues on to the West Branch Reservoir in Putnam County, New York, then the Kensico Reservoir in Westchester County, both north of the City. It then continues further south to the Hillview Reservoir in Yonkers, where it joins the flows of the Catskill and New Croton aqueducts for distribution through the New York City tunnel system.

The Cannonsville Dam is being considered as a site for a 14.08MW hydroelectric generating station.
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