LIHI Certificate #99 - Middlebury Lower, Vermont
The Middlebury Lower Project is located on the Lower Falls of the Otter Creek roughly one mile downstream from Middlebury village in the towns of Middlebury and Weybridge, in Addison County, Vermont. The impoundment extends almost 1.0 mile upstream to the Upper Falls at the center of Middlebury Village. The Sutherland Falls Project (FERC No. 2558) is located approximately 37 miles upstream, and the Beldens Project is located approximately 4 miles downstream.
Two concrete gravity dams impound the east and west river channels that diverge around a small island. The dam is 30 feet high and 478 feet long, with two ogee spillway sections, a 123-foot long western spillway section, and a 260-foot long eastern spillway section. The reservoir impounds 16 acres, with a normal water surface elevation of 314.5 feet above mean sea level (msl). The intake canal is 400 feet long, 40 feet wide, and controlled by a gate structure containing two 23-foot wide, 13-foot high gates. The powerhouse is located at the downstream end of the intake canal, and equipped with steel trashracks having a 1.75 inch clear spacing. Three Francis turbine units provide a total installed capacity of 2.25 MW. Generator leads and transformers connect the Project to the interconnected transmission/distribution system at the switchyard located 100 feet east of the powerhouse. The Middlebury Lower Project is operated as a run-of-river facility. The impoundment elevation typically fluctuates not more than 1 inch from the crest elevation of 314.5 feet during normal operation, and water generally spills over the crest of the dam. Project operation relies upon inflows from upstream developments and the 628 square miles of the Otter Creek drainage basin.
|Project Name||Middlebury Lower|
|LIHI Certificate No.||99|
|LIHI Certificate Term||February 6, 2017 - February 5, 2022|
|Owner||Green Mountain Power Corporation|
|Location||Located at river mile 24.7 on the Lower Falls of the Otter Creek, roughly one mile downstream from Middlebury Village in the towns of Middlebury and Weybridge in Addison County, Vermont.|
|Installed Capacity||2.04 MW|
|Average Annual Generation||8,643 MWH|
|FERC No.||P-2737 issued 2001, expires 2031|