Harriman Dam

Harriman Dam

Location of Harriman Dam in Vermont

Country	United States
Location	Whitingham, Vermont
Coordinates	42°47′37″N 72°54′53″W / 42.79360°N 72.91460°W / 42.79360; -72.91460
Purpose	Hydroelectric
Status	Operational
Opening date	1923
Built by	New England Power Company
Owner(s)	Great River Hydro LLC
Operator(s)	Great River Hydro LLC
Dam and spillways
Type of dam	Earthen
Impounds	Deerfield River
Height (foundation)	215 ft (66 m)
Length	1,250 ft (380 m)
Spillways	1
Spillway type	Glory Hole (conical drain)
Reservoir
Creates	Harriman Reservoir
Total capacity	117,300 acre⋅ft (144,700,000 m³)
Surface area	2,039 acres (825 ha)
Maximum water depth	180 ft (55 m)
Coordinates	42°48′47″N 72°54′11″W / 42.813°N 72.903°W / 42.813; -72.903
Operator(s)	Great River Hydro LLC
Commission date	1923
Type	Hydroelectric

Harriman Dam is a hydroelectric dam in Windham County, Vermont in the town of Whitingham. The water from the dam flows through a penstock to a power generation plant in the adjacent town of Readsboro.

The dam was built in 1923 by the New England Power Company.^[1] Some 215 feet (66 m) high and 1,250 feet (380 m) long as its crest, it is one of ten hydroelectric dams impounding the Deerfield River.^[2] It was purchased from the TransCanada Corporation in 2017 by Great River Hydro LLC, which currently operates the facility.^[3] It is an earthen dam with a relatively unusual concrete "glory hole" (freestanding conical drain) spillway, similar to another example at Monticello Dam in California.^[4]

Harriman Reservoir has a water surface area of 2,039 acres (825 ha), a maximum depth of 180 feet (55 m), and a gross storage capacity of 117,300 acre-feet (144.7 million cubic metres).^[2]

The dam and reservoir were named in recognition of utility executive Henry I. Harriman, a former president of the New England Power Company.

References

^ "Molly Stark Byway Project". Mollystarkbyway.org. Archived from the original on 29 March 2018. Retrieved 11 April 2018.
^ ^a ^b http://www.lowimpacthydro.org/assets/files/Deerfield%2520documents/Attachment%2520C%
^ "Our History".
^ "Harriman Station".

Connecticut River watershed

Tributaries

Connecticut	Blackledge River Coginchaug River Connecticut River Duck River Eightmile River Falls River Farmington River Hockanum River Hubbard River Jeremy River Lieutenant River Mattabesset River Nepaug River Pameacha Creek Park River Pequabuck River Salmon River Scantic River
Massachusetts	Burnshirt River Chapel Brook Chicopee River Connecticut River Cranberry River Deerfield River East Brookfield River Farmington River Fall River Five Mile River Green River Hubbard River Manhan River Mill River (Northampton) Mill River (Springfield) Millers River Mirey Brook North Branch Millers River North Branch Westfield River North River Otter River Quaboag River Scantic River Seven Mile River Tarbell Brook Ware River Westfield River
New Hampshire	Ammonoosuc River Ashuelot River Blow-me-down Brook The Branch Cold River Connecticut River East Branch Mohawk River Gale River Great Brook Halls Stream Ham Branch Indian River Indian Stream Israel River Johns River Knox River Little River Little Sugar River Mascoma River Millers River Mink Brook Mirey Brook Mohawk River Nash Stream North Branch Gale River North Branch Millers River North Branch Sugar River North Branch Upper Ammonoosuc River Oliverian Brook Otter Brook Partridge Brook Perry Stream Phillips Brook Simms Stream South Branch Ashuelot River South Branch Gale River South Branch Israel River South Branch Sugar River Stocker Brook Sugar River Tarbell Brook Upper Ammonoosuc River West Branch Mohawk River West Branch Upper Ammonoosuc River Wild Ammonoosuc River Zealand River
Vermont	Black River Connecticut River Deerfield River Fall River Green River Halls Stream Leach Creek Moose River Nulhegan River Ompompanoosuc River Ottauquechee River Passumpsic River Rock River Saxtons River Utley Brook Waits River Wells River West River Whetstone Brook White River Williams River Winhall River

Lakes

Connecticut	Barkhamsted Reservoir Lake Beseck Lake Hayward Lake Pocotopaug
Massachusetts	Brooks Pond Browning Pond Lake Monomonac Quabbin Reservoir Lake Wyola
New Hampshire	Ashuelot Pond Back Lake Canaan Street Lake Cedar Pond Christine Lake Comerford Reservoir Connecticut Lakes Crystal Lake Dublin Pond Eastman Pond Echo Lake Lake Francis (Murphy Dam) Goose Pond Grafton Pond Granite Lake Lakes of the Clouds Little Sunapee Lake Mascoma Lake McIndoes Reservoir Lake Monomonac Moore Reservoir Pearly Lake Silver Lake Spofford Lake Lake Sunapee Surry Mountain Lake Lake Tarleton
Vermont	Ball Mountain Lake Comerford Reservoir Harvey's Lake McIndoes Reservoir Moore Reservoir North Hartland Lake Lake Rescue Townshend Lake

Towns

Connecticut	Chester Cromwell Deep River East Haddam East Hampton East Hartford East Windsor Enfield Essex Glastonbury Haddam Hartford Higganum Lyme Middletown Moodus Old Lyme Old Saybrook Portland Rocky Hill South Windsor Suffield Thompsonville Wethersfield Windsor Windsor Locks
Massachusetts	Agawam Chicopee Deerfield Easthampton Gill Greenfield Hadley Hatfield Holyoke Longmeadow Millers Falls Montague Northampton Northfield South Hadley Springfield Sunderland Turners Falls West Springfield Whately
New Hampshire	Bath Charlestown Chesterfield Claremont Clarksville Colebrook Columbia Cornish Dalton Groveton Hanover Haverhill Hinsdale Lancaster Lebanon Littleton Lyme Monroe Northumberland Orford Piermont Pittsburg Plainfield Stewartstown Stratford Walpole West Lebanon Westmoreland Woodsville
Quebec	East Hereford
Vermont	Ascutney Barnet Beecher Falls Bellows Falls Bloomfield Bradford Brattleboro Brunswick Canaan Concord Dummerston Fairlee Gilman Guildhall Hartford Hartland Lemington Lunenburg Maidstone Newbury Norwich Putney Rockingham Ryegate Springfield Thetford Vernon Waterford Weathersfield Wells River Westminster White River Junction Wilder Windsor

Crossings