Lake Lillinoah, Shepaug Dam, Connecticut
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| View of the LOx facility from the top of the dam |
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Lake Lillinonah and the Shepaug Hydroelectric Project
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Lake Lillinonah:
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Located in New Milford, Conneticut
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Formed in 1955 by the Shepaug Hydroelectric Project on the Housatonic River
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Operated as a multiple use impoundment by Northeast Generation Services
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Drainage area of 1,400 square miles
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74,000 acre-feet
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At full pond elevation of 200 feet, the reservoir has a surface area of 1,870 acres and is approximately 12 miles long
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Reservoir fluctuates about 4.5 feet
Hydrofacilities at the project include:
- A 1,400 foot long concrete gravity structure dam with a crest elevation of 206 feet
- A single unit powerhouse
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Lake Lillinonah Oxygen Diffuser System
Objective
To meet FERC specifications for re-licnesing purposes, that were part of the terms of the Connecticut Department of Environmental Protection Clean Water Act. This included increasing dissolved oxygen levels in the project releases into the Housatonic River to 5 mg/L.
Facilities
- 3 diffusers in the old riverbed in the forebay extending almost 4,000 feet upstream of the dam
- 13,000 gallon oxygen storage system
- Ambient air vaporizers
- Pressure control and flow distribution piping
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| Filling the anchor weights with concrete |
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| Line diffuser assembly |
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| Anchor connection welded into place |
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| Floating completed supply and diffuser line |
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| Stainless steel oxygen and buoyancy connections at the face of the dam |
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| Bubbles after deployment |
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| First line down |
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| Second line down |
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| Third line down |
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Publications and References
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