Halfway Brook Reservoir is located in Warren County, NY in the Town of Queensbury, near Dixon Road and Old Forge Road, about 900 feet west of Interstate 87. This dam was constructed on Halfway Brook in the Upper Hudson River Watershed and functions as a water supply source for the City of Glens Falls. Historical data indicates that the reservoir was constructed in 1936.

The Halfway Brook Reservoir Dam was constructed as an earthen embankment with a concrete core. The primary spillway was constructed as an ogee weir drop inlet that flows into a tunnel below the dam embankment. The gate house included three knife valves at different elevations, which allow reservoir water to enter a chamber and flow either to the pump house or into the adjacent spillway tunnel.

The dam is an intermediate hazard Class "B" dam under the NYSDEC dam hazard classification system. This hazard classification is based on the potential for damage to homes, main highways, minor railroads or interrupted use or service of relatively important public utilities that may result in the event of a dam breach or uncontrolled release of water from the impoundment.

Rehabilitation and repairs on the Halfway Brook Reservoir Dam were begun in May 2009 and completed in November 2009 by Rozell East, Inc. and William J Keller & Sons. The repairs and modifications were completed to bring the dam into compliance with NYSDEC dam safety guidelines and to continue to provide the City of Glens Falls with potable water. The repairs and modification at Halfway Brook Reservoir Dam included:

• Tree and stump removal from the upstream embankment slope
• SCADA system installation to monitor reservoir elevation
• Seepage control blankets and monitoring at the toe of the dam
• Spillway and spillway tunnel concrete repairs
• Replacement of three intake valves and one outlet valve

Additional work that the City will undertake during the summer of 2010 will be the installation of a debris boom, which will prevent debris from accumulating on and potentially clogging the spillway.

The photos below show the condition of the dam before and after the rehabilitation.