LIHI Certificate #98 - Weybridge Hydroelectric Project, Vermont
The Weybridge Project is situated at the head of a rock-walled gorge where the Otter Creek cascades around a small island, the Weybridge Project is located in the towns of Weybridge and New Haven. The Project forms a compact cluster of buildings and structures around the divided falls at the upstream end of an island. The riverbank corridor within the Project follows the impoundment about 1.5 miles upstream to Huntington Falls (part of Otter Creek Hydro FERC No.2558), and reaches miles downstream from the powerhouse falls. The Vergennes Project (FERC No.2674) is located approximately 12 miles downstream.
The Project consists of a concrete gravity dam with integral powerhouse, a 62-acre impoundment, transmission facilities and appurtenant facilities. The dam is 30 feet high and 302.6 feet long with two spillway sections: a 150-foot long west spillway section, topped with a 6-foot high hinged steel flashboard, and abutted by a 20-foot wide and 10-foot high taintor gate; and a 116-foot long east spillway section topped with an automatically-inflated rubber weir. The reservoir is 1.5 miles long, impounding 62 acres with a normal water surface elevation of 174.3 feet msl. The powerhouse is integral with the dam and has an intake with 3-inch steel trashracks. There is one vertical Kaplan turbine generator with an installed capacity of 3.0 MW. Appropriate generator leads and transformers connect the Project to the interconnected transmission and distribution system at the switchyard located about 100 feet from the powerhouse. The Project operates as a daily cycling facility during normal and low flow conditions. cycling is suspended from April 1 to June 15 to protect fish spawning. The Project operates in a run-of-river mode when flows exceed its hydraulic capacity of 1,600 cubic feet per second. A diversion structure extends from the downstream end of the dam at Rock Island to another small island at the entrance to the bypass channel, and around another island (Wyman Island), reapportioning the flow in the bypassed (west) and tailrace (east) channels. The diversion structure includes a control weir with stop log slots at the downstream end, at the entrance to the west channel. A 15-foot wide by 3.5-foot high notch in the control weir passes water from the pool formed by the control weir and the diversion structure, downstream into the west channel around Wyman Island.
|LIHI Certificate No.||98|
|LIHI Certificate Term||February 6, 2017 - February 5, 2022|
|Owner||Green Mountain Power Corporation|
|Location||Located at river mile 19.5 on Otter Creek in Weybridge and New Haven, Vermont.|
|Installed Capacity||3.0 MW|
|Average Annual Generation||13,846 MWH|
|Facility Type||Daily cycling in normal and low flows; run-of-river in high flows|
|FERC No.||P-2731 issued 2001, expires 2031|