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The
Ellsworth Dam is located between two bluffs which flank Maine's Union River, and rise to a height of more than 100 feet (30 m). The dam consists of a series of buttresses, each set on a schist bedrock ledge, three feet thick, and spaced about 15 feet (4.6 m) apart, which provide support
289:-story structure built out of concrete blocks, with a red tile gabled roof. The Renaissance Revival structure has round-arch windows which are connected by a stone belt course, and there are Palladian windows in the gable ends. An addition on the building's rear was built with similar styling.
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per year as of 2012, and is licensed to supply about 30,000 megawatt-hours per year, which is 1% of Maine's hydropower. It is one of the 118 power-generating dams in Maine as of 2016. The flow of water at the
Ellsworth Dam is controlled by the
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for two large slabs of steel-reinforced concrete that span the river between the bluffs. The dam is 71 feet (22 m) in height, with a spillway 60 feet (18 m) long. The schist ledge ensures the longevity of the dam.
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in 1987, was due to expire in 2017. However, public concern about fish passage and water quality, caused the
Federal Energy Regulatory Commission to delay issuing a new permit. The new expiration date is April 2020.
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The power station was built in 1907 by the Bar Harbor and Union River Power
Company, to designs by its engineer, James Leonard. The company was merged in 1925 into the Bangor Hydro-Electric Company, now part of
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329:(The dam is no longer hollow. During the 1990s. the FERC required installation of post-tensioned anchors deep into ledge and the filling of the hollow dam with concrete, in order to increase dam safety.)
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ever built, having been described as "the highest power dam in New
England" in 1928. The facility was nominated for the
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The dam was in the process of being relicensed as of 2012; its most recent permit, issued by the
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The power station is located at the base of the dam on the west bank of the river. It is a
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Industrial buildings and structures on the
National Register of Historic Places in Maine
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University and college buildings listed on the
National Register of Historic Places
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built in the state, and the hollow concrete dam is one of the highest hollow (or
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508:"Company begins five-year effort to relicense Ellsworth hydroelectric dam"
243:. The dam, located just north of downtown Ellsworth, is also known as the
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Historic districts on the
National Register of Historic Places in Maine
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National
Register of Historic Places listings in Hancock County, Maine
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List of jails and prisons on the
National Register of Historic Places
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393:"National Register Information System – (#85001262)"
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National Register of Historic Places in Hancock County, Maine
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Dams on the National Register of Historic Places in Maine
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is a hydroelectric power generation facility on the
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History of the National Register of Historic Places
440:"NRHP nomination for Ellsworth Power House and Dam"
1080:Buildings and structures in Hancock County, Maine
652:List of U.S. National Historic Landmarks by state
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1044:National Register of Historic Places portal
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1075:Renaissance Revival architecture in Maine
592:U.S. National Register of Historic Places
37:U.S. National Register of Historic Places
1095:Energy infrastructure completed in 1907
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1007:National Historic Preservation Act
292:The Ellsworth Dam produces 29,907
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233:Ellsworth Power House and Dam
112:Show map of the United States
29:Ellsworth Power House and Dam
1100:1907 establishments in Maine
18:United States historic place
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363:Renewable energy portal
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929:Minor Outlying Islands
912:Lists by insular areas
626:Keeper of the Register
543:Maine: An Encyclopedia
475:The Ellsworth American
173:2 acres (0.81 ha)
46:U.S. Historic district
631:National Park Service
611:Contributing property
471:"The Union River Dam"
403:National Park Service
154:44.54417°N 68.43056°W
986:District of Columbia
249:peaking power plants
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159:44.54417; -68.43056
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477:. December 9, 2016
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547:. Retrieved
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979:Other areas
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773:Mississippi
688:Connecticut
539:"Ellsworth"
518:February 5,
303:Graham Lake
267:Description
237:Union River
157: /
133:Coordinates
1069:Categories
888:Washington
808:New Mexico
803:New Jersey
678:California
379:References
145:68°25′50″W
142:44°32′39″N
898:Wisconsin
863:Tennessee
768:Minnesota
743:Louisiana
549:April 20,
481:April 20,
446:April 20,
1054:Category
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813:New York
788:Nebraska
778:Missouri
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738:Kentucky
718:Illinois
693:Delaware
683:Colorado
673:Arkansas
333:See also
253:Ambursen
216:85001262
193:Engineer
122:Location
1000:Related
903:Wyoming
878:Vermont
783:Montana
723:Indiana
703:Georgia
698:Florida
668:Arizona
658:Alabama
309:History
284:⁄
255:-type)
183: (
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663:Alaska
599:Topics
970:Palau
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316:Emera
178:Built
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728:Iowa
551:2021
520:2015
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448:2021
231:The
185:1907
181:1907
170:Area
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