Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Ha...
Significance: The Holyoke Bridge is significant as one of Massachusetts' few known examples of the riveted lattice truss bridge, a type most commonly associated with railroad construction in the latter half of ... More
Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Ha...
Significance: The Holyoke Bridge is significant as one of Massachusetts' few known examples of the riveted lattice truss bridge, a type most commonly associated with railroad construction in the latter half of ... More
Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Ha...
Significance: The Holyoke Bridge is significant as one of Massachusetts' few known examples of the riveted lattice truss bridge, a type most commonly associated with railroad construction in the latter half of ... More
Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Ha...
Significance: The Holyoke Bridge is significant as one of Massachusetts' few known examples of the riveted lattice truss bridge, a type most commonly associated with railroad construction in the latter half of ... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Upper Mississippi River 9-Foot Channel Project, Lock & Dam No. 5, Minn...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With root in the Progressive Era, the project was adopted by New Deal propo... More
Hume Lake Dam, Sequioa National Forest, Hume, Fresno County, CA
Significance: Hume Lake Dam was the world's first reinforced a concrete multiple arch dam. Built to impound reservoir for the Hume-Bennett Lumber Company, today it is the only major surviving structure represe... More
Continental Gin Company, Prattville, Autauga County, AL
Significance: The site was acquired by Daniel Pratt in 1838, and he soon established grist and lumber and shingle mills there. By 1844, he had opened a cotton gin plant, the products of which were in great dem... More
Continental Gin Company, Prattville, Autauga County, AL
Significance: The site was acquired by Daniel Pratt in 1838, and he soon established grist and lumber and shingle mills there. By 1844, he had opened a cotton gin plant, the products of which were in great dem... More
Continental Gin Company, Prattville, Autauga County, AL
Significance: The site was acquired by Daniel Pratt in 1838, and he soon established grist and lumber and shingle mills there. By 1844, he had opened a cotton gin plant, the products of which were in great dem... More
Continental Gin Company, Prattville, Autauga County, AL
Significance: The site was acquired by Daniel Pratt in 1838, and he soon established grist and lumber and shingle mills there. By 1844, he had opened a cotton gin plant, the products of which were in great dem... More
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain image of an arch bridge, stone structure, architecture, free to use, no copyright restrictions.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain image of an arch bridge, stone architecture, free to use, no copyright restrictions.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain image of a bridge over a water stream, free to use, no copyright restrictions.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain image of an arch bridge, stone structure, architecture, free to use, no copyright restrictions.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Picryl description: Public domain vintage artistic photograph, free to use, no copyright restrictions image.
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Public domain photograph of construction architecture design, diagram, free to use, no copyright restrictions image - Picryl description
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
Eads Bridge, Spanning Mississippi River at Washington Street, Saint Lo...
Public domain photograph - historical image of Missouri, United States, free to use, no copyright restrictions image - Picryl description
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Slater Mill, Pawtucket, Providence County, RI
For additional documentation, see also Slater Mill (HABS RI-82). Significance: The Slater Mill was the first successful cotton factory, and the first water powered spinning mill using the Arkwright system of ca... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Hamilton Canal, Wasteway Gatehouse, Lowell, Middlesex County, MA
Significance: The existing gatehouse as built in 1872 to replace the original gatehouse, which had been constructed in 1850. The original equipment for operating the gate is still in existence. Survey number:... More
Bureau of Mines Boulder City Experimental Station, Date Street north o...
Public domain photograph - historical image of Nevada, United States, free to use, no copyright restrictions image - Picryl description
Old Croton Aqueduct, Entrance Entablature, New Croton Reservoir, Yorkt...
Significance: The Old Croton Aqueduct is an outstanding example of 19th century civil engineering and was New York City's first municipal water project. The entrance entablature commemorated the opening of the... More
Northern Canal, Pawtucket Gatehouse, Northern Canal & Merrimack River,...
Public domain photograph - historical image of Massachusetts, United States, free to use, no copyright restrictions image - Picryl description
Bureau of Mines Boulder City Experimental Station, Annex, Date Street ...
Significance: Building 800, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More
Bureau of Mines Boulder City Experimental Station, Annex, Date Street ...
Significance: Building 800, as part of the Date Street Complex, was part of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Boulder City... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Hoover Dam, Spanning Colorado River at Route 93, Boulder City, Clark C...
Significance: It is a National Historic Landmark, an American Civil Engineering Landmark, and the focus of an historic district listed on the National Register of Historic Places. The dam was constructed betwee... More
Burlington Woolen Mill Company, Dam, Winooski River, West of Bridge ca...
Significance: Despite substantial erosion, the dam is significant as an example of timber-crib construction, a common 19th-century technology, and as one of the earliest-known dams to have used concrete as a st... More
Ames Hydroelectric Plant, Ames, San Miguel County, CO
Significance: In 1890-91 L.L. Nunn built the world's first single-phase AC power transmission system at Ames in order to power the nearby Gold King Mine's stamp mill. The plant operated under a head of 320 feet... More
Noxontown Mill, Noxontown Road (County Road 38), Middletown, New Castl...
Significance: Noxontown Mill was typical of the small grain-milling establishments that predominated in Delaware throughout the colonial period. But it was atypical in the sense that it survived so long. In 1... More
Noxontown Mill, Noxontown Road (County Road 38), Middletown, New Castl...
Significance: Noxontown Mill was typical of the small grain-milling establishments that predominated in Delaware throughout the colonial period. But it was atypical in the sense that it survived so long. In 1... More
Eastern Canal, Bridge & Armory Streets vicinity, Lowell, Middlesex Cou...
Significance: The opening of the Eastern Canal in 1835 marked the end of the second phase of construction of the Lowell Canal System as it had been planned in 1821. The Eastern Canal connected the Pawtucket an... More
Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15...
Significance: The Middle Creek Hydroelectric Dam is a significant example of a timber crib dam and small electric generating station, that is typical of early rural electrification in America. Locally it was a... More
Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15...
Significance: The Middle Creek Hydroelectric Dam is a significant example of a timber crib dam and small electric generating station, that is typical of early rural electrification in America. Locally it was a... More
Middle Creek Hydroelectric Dam, On Middle Creek, West of U.S. Route 15...
Significance: The Middle Creek Hydroelectric Dam is a significant example of a timber crib dam and small electric generating station, that is typical of early rural electrification in America. Locally it was a... More
Moody Street Feeder, Gatehouse, Moody Street Feeder & Merrimack Canal,...
Significance: The Moody Street Feeder Gatehouse contains manually controlled equipment for operating the sluice gates which were used to control the flow of water through the Moody Street Feeder. Survey number... More
Tallassee Shoals Hydroelectric Facility, Middle Oconee River, Athens, ...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Tallassee Shoals Hydroelectric Facility, Middle Oconee River, Athens, ...
Picryl description: Public domain image of a park, trees, outdoors, free to use, no copyright restrictions.
Hamilton Canal, Jackson Street vicinity, Lowell, Middlesex County, MA
Picryl description: Public domain image of a canal, barge, historic place, water reflection, 19th century, free to use, no copyright restrictions.
Elson Bridge, Spanning Purgatoire River at County Road 36, El Moro, La...
Survey number: HAER CO-77 Building/structure dates: 1905 Initial Construction Building/structure dates: 1957 Subsequent Work
Elson Bridge, Spanning Purgatoire River at County Road 36, El Moro, La...
Survey number: HAER CO-77 Building/structure dates: 1905 Initial Construction Building/structure dates: 1957 Subsequent Work
Elson Bridge, Spanning Purgatoire River at County Road 36, El Moro, La...
Survey number: HAER CO-77 Building/structure dates: 1905 Initial Construction Building/structure dates: 1957 Subsequent Work
Rock Creek Mining District, Upper, Lower & Waterman Ditches, Near inte...
Significance: The hydraulicking ditches of the Rock Creek Mining District are early representatives of a hydraulic mining process invented in California in 1852. The ditches preserve an early localized impleme... More
Old Croton Aqueduct, Saw Mill River Culvert, Spanning Nepperhan Avenue...
Public domain image of an arch structure, bridge, historic place ruins, classical architecture, free to use, no copyright restrictions - Picryl description
Old Croton Aqueduct, Saw Mill River Culvert, Spanning Nepperhan Avenue...
Public domain photograph - city, downtown, New York, United States, free to use, no copyright restrictions image - Picryl description
Old Croton Aqueduct, Saw Mill River Culvert, Spanning Nepperhan Avenue...
Public domain photograph - New York, United States, free to use, no copyright restrictions image - Picryl description
Old Croton Aqueduct, Saw Mill River Culvert, Spanning Nepperhan Avenue...
Picryl description: Public domain image of a park, trees, outdoors, free to use, no copyright restrictions.
S. U. M. Hydroelectric Plant, McBride Avenue, Paterson, Passaic County...
Significance: The S.U.M. Hydroelectric Plant was constructed in 1912-1914 to meet the electrical power needs of the mill and factory owners and tenants in the Paterson area. It superceded the power canal syste... More
S. U. M. Hydroelectric Plant, McBride Avenue, Paterson, Passaic County...
Significance: The S.U.M. Hydroelectric Plant was constructed in 1912-1914 to meet the electrical power needs of the mill and factory owners and tenants in the Paterson area. It superceded the power canal syste... More
Lowell Canal System, Merrimack & Concord Rivers, Lowell, Middlesex Cou...
Significance: The City of Lowell is generally considered to be the birthplace of large-scale manufacturing in the U.S. Begun as a transportation canal, the Lowell Canal System evolved, during the 19th century,... More
Indiana Central Canal, Indianapolis Division, Parallel to West Street,...
Significance: The Indianapolis Division of the Indiana Central Canal is possibly the oldest remaining man-made structure or facility in Indianapolis-Marion County. The canal is listed on the Indiana State Regi... More
Lockville Hydroelectric Plant, Deep River, 3.5 miles upstream from Haw...
Significance: The Lockville dam, canal, and powerhouse occupy a site which is closely associated with important events in the history of Chatham County and in the overall development of North Carolina. Lord Co... More
Bureau of Mines Boulder City Experimental Station, Electrolytic Mangan...
Significance: Building 500, as part of the Date Street Complex, was a component of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Bould... More
Bureau of Mines Boulder City Experimental Station, Electrolytic Mangan...
Significance: Building 500, as part of the Date Street Complex, was a component of the Bureau of Mines Electrometallurgical Research Facility located in Boulder City. As such, it is within the designated Bould... More
Ouachita River Lock & Dam No. 8, Ouachita River at River Mile 282.8, C...
Significance: The Ouachita River Lock and Dam No. 8 is one of the oldest remaining locks and dams in the State of Arkansas. It represents a vital segment in the earliest attempt by the U.S. Army Corps of Engin... More
Ouachita River Lock & Dam No. 8, Ouachita River at River Mile 282.8, C...
Significance: The Ouachita River Lock and Dam No. 8 is one of the oldest remaining locks and dams in the State of Arkansas. It represents a vital segment in the earliest attempt by the U.S. Army Corps of Engin... More
Ouachita River Lock & Dam No. 8, Ouachita River at River Mile 282.8, C...
Significance: The Ouachita River Lock and Dam No. 8 is one of the oldest remaining locks and dams in the State of Arkansas. It represents a vital segment in the earliest attempt by the U.S. Army Corps of Engin... More
Ouachita River Lock & Dam No. 8, Ouachita River at River Mile 282.8, C...
Significance: The Ouachita River Lock and Dam No. 8 is one of the oldest remaining locks and dams in the State of Arkansas. It represents a vital segment in the earliest attempt by the U.S. Army Corps of Engin... More
Plante Grist Mill, U.S. Route 44, Chepachet, Providence County, RI
Significance: The Plante Grist Mill is a typical example of owner built mill structures that could be found all over New England during the mid-19th century. Unprocessed Field note material exists for this str... More
Plante Grist Mill, U.S. Route 44, Chepachet, Providence County, RI
Significance: The Plante Grist Mill is a typical example of owner built mill structures that could be found all over New England during the mid-19th century. Unprocessed Field note material exists for this str... More
Erie Canal (Enlarged), Upper Mohawk River Aqueduct, Mohawk River, Stat...
See also HAER NY-384. Significance: Remains of one of the two aqueducts built to carry the Enlarged Erie Canal over the Mohawk River. Survey number: HAER NY-12 Building/structure dates: ca. 1842 Initial Const... More
Woodville Canal Company, West side of Snake River (River Mile 796), Wo...
Significance: The Woodville Canal Company represents one of the few remaining small-scale canal companies operating in eastern Idaho that continues to be administered and managed by district farmers. The Woodv... More
New York State Barge Canal, Lockport Locks, Richmond Avenue, Lockport,...
Locks E34 and E35 were surveyed as part of the 2009 New York State Barge Canal survey; see HAER Nos. NY-515 (Lock E34) and NY-516 (Lock E35). Significance: Locks 67-71 (north flight) comprise a rare 19th-centur... More
New York State Barge Canal, Lockport Locks, Richmond Avenue, Lockport,...
Locks E34 and E35 were surveyed as part of the 2009 New York State Barge Canal survey; see HAER Nos. NY-515 (Lock E34) and NY-516 (Lock E35). Significance: Locks 67-71 (north flight) comprise a rare 19th-centur... More
New York State Barge Canal, Lockport Locks, Richmond Avenue, Lockport,...
Locks E34 and E35 were surveyed as part of the 2009 New York State Barge Canal survey; see HAER Nos. NY-515 (Lock E34) and NY-516 (Lock E35). Significance: Locks 67-71 (north flight) comprise a rare 19th-centur... More
New York State Barge Canal, Lockport Locks, Richmond Avenue, Lockport,...
Locks E34 and E35 were surveyed as part of the 2009 New York State Barge Canal survey; see HAER Nos. NY-515 (Lock E34) and NY-516 (Lock E35). Significance: Locks 67-71 (north flight) comprise a rare 19th-centur... More
Shoshone Hydroelectric Plant Complex, 60111 U.S. Highway 6, Glenwood S...
Significance: The Shoshone complex is significant for being one of the earliest hydroelectric plants on the Colorado River and one of the largest in the Rocky Mountain Region to depend upon the flow of a river ... More
Shoshone Hydroelectric Plant Complex, 60111 U.S. Highway 6, Glenwood S...
Significance: The Shoshone complex is significant for being one of the earliest hydroelectric plants on the Colorado River and one of the largest in the Rocky Mountain Region to depend upon the flow of a river ... More
Shoshone Hydroelectric Plant Complex, 60111 U.S. Highway 6, Glenwood S...
Significance: The Shoshone complex is significant for being one of the earliest hydroelectric plants on the Colorado River and one of the largest in the Rocky Mountain Region to depend upon the flow of a river ... More
Shoshone Hydroelectric Plant Complex, 60111 U.S. Highway 6, Glenwood S...
Significance: The Shoshone complex is significant for being one of the earliest hydroelectric plants on the Colorado River and one of the largest in the Rocky Mountain Region to depend upon the flow of a river ... More
Pawtucket Canal, Lower Locks, Lowell, Middlesex County, MA
Significance: The Lower Locks are comprised of two navigation locks and a dam, with a head of 17 feet. They were some of the earliest locks in the Lowell Canal System, originally constructed in the first phase... More
Hydroelectric Power Development North Highlands, Thirty-eighth Street ...
Significance: This development was the largest in the South when built in 1900. Originally, the dam provided water for 2 power houses: one for hydroelectric power generation, one for hydromechanical power tran... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 6, Trempealeau,...
Significance: The Upper Mississippi River Lock and Dam Project represents one of the largest and most ambitious of such undertakings. With roots in the Progressive Era, the project was adopted by New Deal prop... More