Heber Light & Power Company, Hydroelectric Plant, U.S. Route 40/189, H...
Significance: Heber Light and Power Plant is representative of the large number of modest hydroelectric stations built during the first two decades of the twentieth century as a result of the growing demand for... More
Tallassee Shoals Hydroelectric Facility, Middle Oconee River, Athens, ...
Picryl description: Public domain image of a bridge over a water stream, free to use, no copyright restrictions.
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.
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... 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
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a damaged, burned, or destroyed building, natural disaster, war destruction, ruins, 19th-century architecture, free to use, no copyright restrictions.
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Mountain Dell Dam, Parley's Canyon, Northwest side of I-80, West of St...
Significance: Mountain Dell Dam is an early application of multiple-arch reinforced-concrete construction to dam engineering. The design developed by John S. Eastwood consisted of a series of arches set at an a... More
Columbia Canal & Power Plant, Waterfront of Broad River, Columbia, Ric...
Significance: Designed to enable the navigation of the Broad and Congaree Rivers at their confluence in Columbia, the canal was completed in 1824 and enlarged in 1891; the 1891 portion of the canal is the signi... More
Columbia Canal & Power Plant, Waterfront of Broad River, Columbia, Ric...
Significance: Designed to enable the navigation of the Broad and Congaree Rivers at their confluence in Columbia, the canal was completed in 1824 and enlarged in 1891; the 1891 portion of the canal is the signi... More
Columbia Canal & Power Plant, Waterfront of Broad River, Columbia, Ric...
Significance: Designed to enable the navigation of the Broad and Congaree Rivers at their confluence in Columbia, the canal was completed in 1824 and enlarged in 1891; the 1891 portion of the canal is the signi... More
Heber Light & Power Company, Hydroelectric Plant, U.S. Route 40/189, H...
Significance: Heber Light and Power Plant is representative of the large number of modest hydroelectric stations built during the first two decades of the twentieth century as a result of the growing demand for... More
Heber Light & Power Company, Hydroelectric Plant, U.S. Route 40/189, H...
Significance: Heber Light and Power Plant is representative of the large number of modest hydroelectric stations built during the first two decades of the twentieth century as a result of the growing demand for... 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.
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... 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
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
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
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Public domain image of an arch structure, bridge, historic place ruins, classical architecture, free to use, no copyright restrictions - Picryl description
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a river, water stream, lake or pond, park or forest, natural landscape, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain photo of a factory, warehouse, commercial or industrial building, free to use, no copyright restrictions image.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a river, water stream, lake or pond, park or forest, natural landscape, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Columbia Canal & Power Plant, Waterfront of Broad River, Columbia, Ric...
Significance: Designed to enable the navigation of the Broad and Congaree Rivers at their confluence in Columbia, the canal was completed in 1824 and enlarged in 1891; the 1891 portion of the canal is the signi... More
Heber Light & Power Company, Hydroelectric Plant, U.S. Route 40/189, H...
Significance: Heber Light and Power Plant is representative of the large number of modest hydroelectric stations built during the first two decades of the twentieth century as a result of the growing demand for... 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.
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Columbus Railroad Company, Power Station, Eighteenth Street on Chattah...
Significance: This was the first central hydroelectric generating station in Columbus. From 1887-1906 it produced most of the electricity used for street, commercial and residential lighting, and for small pow... 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
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of an industrial equipment, workshop, assembly line, factory, power engine, 19th-20th century, free to use, no copyright restrictions.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain vintage artistic photograph, free to use, no copyright restrictions image.
Michigan Lake Superior Power Company, Portage Street, Sault Ste. Marie...
Picryl description: Public domain image of a hydroelectric dam, industrial facility, power generation, water cascade, free to use, no copyright restrictions.
Gregg Shoals Dam & Power Plant, Across Savannah River, Lowndesville, A...
Significance: The Gregg Shoals Dam and Power Plant began operations in May 1907 and produced electricity until September 1954. It was among the early low-head hydroelectric plants in America and is associated ... More
Upper Mississippi River 9-Foot Channel, Lock & Dam No. 9, Lynxville, C...
See HAER MN-20, Upper Mississippi River Nine-Foot Channel Project History, Locks and Dams 3-10, for additional information. Significance: The Upper Mississippi River Lock and Dam Project represents one of the l... More
Heber Light & Power Company, Hydroelectric Plant, U.S. Route 40/189, H...
Significance: Heber Light and Power Plant is representative of the large number of modest hydroelectric stations built during the first two decades of the twentieth century as a result of the growing demand for... 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.
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... More
Battle Creek Hydroelectric System, Battle Creek & Tributaries, Red Blu...
STORED OFF SITE AND ON SITE. mchr Significance: The Battle Creek hydroelectric system was a typical turn-of-the-century California hydroelectric system, characterized by high head plants, the use of the impulse... 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
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
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