Significance: Streetcar Number 224 was built by the Saint Louis Car Company in 1926. It was bought that same year by the Fort Smith Light and Traction Company and served the Fort Smith, Van Buren area with dis More
Significance: Established in 1879, Homestead Works is one of six plants (Homestead, Edgar Thomson, Duquesne, Irvin, National and Clairton) which, until the collapse in 1982, comprised U.S. Steel's Mon Valley wo More
Significance: Station "L" is primarily a group of six structures designed and built by the Portland General Electric Company between 1910 and 1929. The Station represents the growth and the use of Portland Gen More
Significance: The Silver King Mining Company became one of the major producers in the Park City district of Utah and attained a brief reputation as the richest silver mine in the known world. One of the smalle More
Significance: The Silver King Mining Company became one of the major producers in the Park City district of Utah and attained a brief reputation as the richest silver mine in the known world. One of the smalle More
Significance: The Core Creek Bridge is one of relatively few swing span type bridges that survive at the regional and national level. The once-common swing span type was the only technologically-feasible movab More
Significance: The Core Creek Bridge is one of relatively few swing span type bridges that survive at the regional and national level. The once-common swing span type was the only technologically-feasible movab More
Significance: It is believed that the plans for deployment and initiation of construction of this facility were instrumental in obtaining Soviet agreement to the Anti-Ballistic Missile Treaty and a subsequent d More
Significance: The Long Lake hydroelectric facility is significant as one of the earliest and, for many years, largest hydroelectric generating facilities in The Washington Water Power Company's electrical power More
Significance: The Roosevelt Power Canal was built as an integral part of the Salt River Project and represents the U. S. Reclamation Service's first involvement in the construction of hydroelectric power facili More
Significance: The Roosevelt Power Canal was built as an integral part of the Salt River Project and represents the U. S. Reclamation Service's first involvement in the construction of hydroelectric power facili More
Significance: The Roosevelt Power Canal was built as an integral part of the Salt River Project and represents the U. S. Reclamation Service's first involvement in the construction of hydroelectric power facili More
Significance: The Roosevelt Power Canal was built as an integral part of the Salt River Project and represents the U. S. Reclamation Service's first involvement in the construction of hydroelectric power facili More
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
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
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
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
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
Significance: Buildings 1 and 2 at Canal Station were constructed in 1861 and 1887 as carbarns in support of the operation of the New Orleans City Railroad Company. The design, construction, and modification o More
Significance: The Dresden Island Lock and Dam site is significant as a component of the Illinois Waterway, which was developed to provide a navigable route from Lake Michigan to the Mississippi River and beyond More
Significance: The Dresden Island Lock and Dam site is significant as a component of the Illinois Waterway, which was developed to provide a navigable route from Lake Michigan to the Mississippi River and beyond More
Significance: Rare, intact example of nationally significant historic engineering listed on the National Register of Historic Places as part of the Lock 19 National Register District. The U.S. Army Corps of More
Significance: As the Chattahoochee crosses the fall line at Columbus, Georgia, it falls 125 feet within 2 1/2 miles producing a potential energy of between 66,000 and 99,000 horsepower. That water power made C More
also CAL, 38-SANFRA-137-A- San Francisco Railway: Cable Car Powerhouse & Barn Significance: The last operating cable railroad in the world. Representative of an important type of urban transportation system in More
also CAL, 38-SANFRA-137-A- San Francisco Railway: Cable Car Powerhouse & Barn Significance: The last operating cable railroad in the world. Representative of an important type of urban transportation system in More
Significance: The Chesapeake & Ohio Canal Lift Bridge is significant as a rare surviving example of a short-span railroad vertical lift bridge, for its unusual design elements to allow unimpeded passage of cana More
Significance: The 1913 Glens Falls Dam is architecturally and historically significant as a remarkably intact example of dam construction which reflects early twentieth century design and technology. The Dam o More
Significance: Developed over a 50 year time span by Seattle City Light, the Skagit River Hydroelectric Project consists of three large dams and power plants: Gorge, Diablo, and Ross. Associated with it is the More
Written data based on U.S. Department of Energy booklet, "Shippingport: The Nation's First Atomic Power Station" (1983). Significance: Operational in December, 1957, Shippingport Atomic Power Station was the fi More
Written data based on U.S. Department of Energy booklet, "Shippingport: The Nation's First Atomic Power Station" (1983). Significance: Operational in December, 1957, Shippingport Atomic Power Station was the fi More
Written data based on U.S. Department of Energy booklet, "Shippingport: The Nation's First Atomic Power Station" (1983). Significance: Operational in December, 1957, Shippingport Atomic Power Station was the fi More