Significance: The Rock Creek and Potomac Parkway Bridge near P Street is a typical parkway structure of the 1930s. Its design, materials and construction are representative of parkway bridges in the National P More
Significance: The Rock Creek and Potomac Parkway Bridge near P Street is a typical parkway structure of the 1930s. Its design, materials and construction are representative of parkway bridges in the National P More
Significance: The Rock Creek and Potomac Parkway Bridge near P Street is a typical parkway structure of the 1930s. Its design, materials and construction are representative of parkway bridges in the National P More
Significance: The Rock Creek and Potomac Parkway Bridge near P Street is a typical parkway structure of the 1930s. Its design, materials and construction are representative of parkway bridges in the National P More
Significance: The Rock Creek and Potomac Parkway Bridge near P Street is a typical parkway structure of the 1930s. Its design, materials and construction are representative of parkway bridges in the National P More
Significance: The Childs-Irving Hydroelectric Project encompasses a unique water-pressure/electric-turbine system according to engineering historians evaluating the historic complex since 1976 that 1) was const More
Significance: The Childs-Irving Hydroelectric Project encompasses a unique water-pressure/electric-turbine system according to engineering historians evaluating the historic complex since 1976 that 1) was const More
Significance: The Childs-Irving Hydroelectric Project encompasses a unique water-pressure/electric-turbine system according to engineering historians evaluating the historic complex since 1976 that 1) was const More