Bidwell Bar Suspension Bridge & Stone Toll House, Near Lake Oroville (...
Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t... More
Watervliet Arsenal, South Broadway, Watervliet, Albany County, NY
Significance: Though the War of 1812 stimulated its establishment, Watervliet Arsenal's busiest years occurred during the Mexican and Civil Wars. In 1889, it became the government's cannon factory, famous for ... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
Telluride Power Company, Nunn Hydroelectric Plant, Southeast side of P...
Significance: This plant represents L.L. Nunn's first major hydroelectric generating facility outside of Colorado. At the time of completion (1898), it generated three-phase AC power at a pressure of 40,000 vo... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Lover's Leap Lenticular Bridge, Spanning Housatonic River on Pumpkin H...
Significance: The structure is 19 feet wide and 173 feet long. It is the most recently built lenticular through truss surviving in Connecticut, as of 1984. It has been replaced by a new bridge built several y... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster,...
Significance: The single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two pa... More
Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster,...
Significance: The single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two pa... More
Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster,...
Significance: The single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two pa... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
David Dunlop Tobacco Factory, 45-127 Old Street, Petersburg, Petersbur...
Significance: This tobacco factory, which is today part of a larger complex, was erected c. 1887-1888 by David Dunlop. It is the oldest tobacco building still being used for tobacco manufacturing in Petersburg... More
David Dunlop Tobacco Factory, 45-127 Old Street, Petersburg, Petersbur...
Significance: This tobacco factory, which is today part of a larger complex, was erected c. 1887-1888 by David Dunlop. It is the oldest tobacco building still being used for tobacco manufacturing in Petersburg... More
Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon,...
Significance: This is the site of the first bridge crossing of the Colorado River within the Grand Canyon National Park. It comprises an excellent example of an early 20th century suspension bridge designed fo... More
Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon,...
Significance: This is the site of the first bridge crossing of the Colorado River within the Grand Canyon National Park. It comprises an excellent example of an early 20th century suspension bridge designed fo... More
Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...
Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Luckenbach Flour Mill, 250 feet east of Monocacy Creek, 250 feet west ...
Significance: Located on the foundation of a 1751 Moravian grist mill, the Luckenbach Flour Mill represents the evolution of milling technology in the last half of the 19th century. Roller milling machinery wa... More
Luckenbach Flour Mill, 250 feet east of Monocacy Creek, 250 feet west ...
Significance: Located on the foundation of a 1751 Moravian grist mill, the Luckenbach Flour Mill represents the evolution of milling technology in the last half of the 19th century. Roller milling machinery wa... More
Waddell "A" Truss Bridge, Spanning Lin Branch Creek, Trimble, Clinton ...
The address was changed to reflect that the bridge was moved from its original location (Spanning Linn Branch Creek, Trimble vicinity, Clinton County, Missouri) to Parkville, Missouri, in 1987. (March 2016) Si... More
Waddell "A" Truss Bridge, Spanning Lin Branch Creek, Trimble, Clinton ...
The address was changed to reflect that the bridge was moved from its original location (Spanning Linn Branch Creek, Trimble vicinity, Clinton County, Missouri) to Parkville, Missouri, in 1987. (March 2016) Si... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
Boardman's Lenticular Bridge, Spanning Housatonic River on Boardman's ...
Significance: 188 feet in length, in 1984 this bridge was the longest lenticular truss in the State. Aside from redecking, the bridge retains almost all of its historic integrity. It is scheduled for replacem... More
Boardman's Lenticular Bridge, Spanning Housatonic River on Boardman's ...
Significance: 188 feet in length, in 1984 this bridge was the longest lenticular truss in the State. Aside from redecking, the bridge retains almost all of its historic integrity. It is scheduled for replacem... More
Boardman's Lenticular Bridge, Spanning Housatonic River on Boardman's ...
Significance: 188 feet in length, in 1984 this bridge was the longest lenticular truss in the State. Aside from redecking, the bridge retains almost all of its historic integrity. It is scheduled for replacem... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Lover's Leap Lenticular Bridge, Spanning Housatonic River on Pumpkin H...
Significance: The structure is 19 feet wide and 173 feet long. It is the most recently built lenticular through truss surviving in Connecticut, as of 1984. It has been replaced by a new bridge built several y... More
Lover's Leap Lenticular Bridge, Spanning Housatonic River on Pumpkin H...
Significance: The structure is 19 feet wide and 173 feet long. It is the most recently built lenticular through truss surviving in Connecticut, as of 1984. It has been replaced by a new bridge built several y... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster,...
Significance: The single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two pa... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Washington Avenue Lenticular Truss Bridge, Spanning Mad River, Waterbu...
Significance: This is one of only four lenticular trusses in the United States that was built by the Corrugated Metal Company. Survey number: HAER CT-18 Building/structure dates: ca. 1880 Initial Construction
Washington Avenue Lenticular Truss Bridge, Spanning Mad River, Waterbu...
Significance: This is one of only four lenticular trusses in the United States that was built by the Corrugated Metal Company. Survey number: HAER CT-18 Building/structure dates: ca. 1880 Initial Construction
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Boston Manufacturing Company, 144-190 Moody Street, Waltham, Middlesex...
Significance: The Boston Manufacturing Company was the first major industrial corporation in the United States. Founded in 1813 by Francis Cabot Lowell, Patrick T. Jackson, and others, the Boston Manufacturing... More
Cornish-Windsor Covered Bridge, Spanning Connecticut River between Cor...
Significance: The Cornish-Windsor Bridge is the longest covered bridge in the U.S. and the second-longest two-span covered bridge in the world. It is an excellent example of the work of James Tasker and Bela F... More
Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon,...
Significance: This is the site of the first bridge crossing of the Colorado River within the Grand Canyon National Park. It comprises an excellent example of an early 20th century suspension bridge designed fo... More
Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon,...
Significance: This is the site of the first bridge crossing of the Colorado River within the Grand Canyon National Park. It comprises an excellent example of an early 20th century suspension bridge designed fo... More
Kaibab Trail Suspension Bridge, Spanning Colorado River, Grand Canyon,...
Significance: This is the site of the first bridge crossing of the Colorado River within the Grand Canyon National Park. It comprises an excellent example of an early 20th century suspension bridge designed fo... More
Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...
Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... More
Bellows Falls Arch Bridge, Spanning Connecticut River, North Walpole, ...
Significance: When built, the bridge was the longest single span highway bridge in the U.S. and is was among the largest three-hinged arch bridges in the world. The structure has also played an important role i... 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
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Boott Cotton Mills, John Street at Merrimack River, Lowell, Middlesex ...
Significance: Boott Cotton Mills is one of the oldest surviving large-scale textile mill complexes in the United States. Built as an original, and integral, part of the City of Lowell, the Boott Cotton Mills h... More
Luckenbach Flour Mill, 250 feet east of Monocacy Creek, 250 feet west ...
Significance: Located on the foundation of a 1751 Moravian grist mill, the Luckenbach Flour Mill represents the evolution of milling technology in the last half of the 19th century. Roller milling machinery wa... More
Bidwell Bar Suspension Bridge & Stone Toll House, Near Lake Oroville (...
Significance: This structure is the only surviving suspension bridge in the American West dating to the mid 19th century. When reconstructed over Lake Oroville, it was "strengthened" with pile supports under t... More
Waddell "A" Truss Bridge, Spanning Lin Branch Creek, Trimble, Clinton ...
The address was changed to reflect that the bridge was moved from its original location (Spanning Linn Branch Creek, Trimble vicinity, Clinton County, Missouri) to Parkville, Missouri, in 1987. (March 2016) Si... More
Waddell "A" Truss Bridge, Spanning Lin Branch Creek, Trimble, Clinton ...
The address was changed to reflect that the bridge was moved from its original location (Spanning Linn Branch Creek, Trimble vicinity, Clinton County, Missouri) to Parkville, Missouri, in 1987. (March 2016) Si... More
Waddell "A" Truss Bridge, Spanning Lin Branch Creek, Trimble, Clinton ...
The address was changed to reflect that the bridge was moved from its original location (Spanning Linn Branch Creek, Trimble vicinity, Clinton County, Missouri) to Parkville, Missouri, in 1987. (March 2016) Si... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
American Falls Water, Power & Light Company, Island Power Plant, Snake...
Significance: This site represents technology associated with the first era of long distance electric power transmission in the state. It is also a representative example of an early low-head hydroelectric pow... More
Telluride Power Company, Nunn Hydroelectric Plant, Southeast side of P...
Significance: This plant represents L.L. Nunn's first major hydroelectric generating facility outside of Colorado. At the time of completion (1898), it generated three-phase AC power at a pressure of 40,000 vo... More
Telluride Power Company, Nunn Hydroelectric Plant, Southeast side of P...
Significance: This plant represents L.L. Nunn's first major hydroelectric generating facility outside of Colorado. At the time of completion (1898), it generated three-phase AC power at a pressure of 40,000 vo... More
Telluride Power Company, Nunn Hydroelectric Plant, Southeast side of P...
Significance: This plant represents L.L. Nunn's first major hydroelectric generating facility outside of Colorado. At the time of completion (1898), it generated three-phase AC power at a pressure of 40,000 vo... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Georgetown Steam Plant, South Warsaw Street, King County Airport, Seat...
Significance: The Georgetown Steam Plant is an early reinforced concrete structure housing America's last operable examples of the "first generation" of large scale, vertical steam turbine electric generators. ... More
Erie-Lackawanna Railroad, Tunkhannock Viaduct, Nicholson, Wyoming Coun...
Significance: When the Lackawanna Railroad's 39.6-mile Clarks Summit-Halstead Cutoff in northeastern Pennsylvania was dedicated on Saturday, November 6, 1915, the 2,375-foot-long, 240-foot-high Tunkhannock Viad... More
Erie-Lackawanna Railroad, Tunkhannock Viaduct, Nicholson, Wyoming Coun...
Significance: When the Lackawanna Railroad's 39.6-mile Clarks Summit-Halstead Cutoff in northeastern Pennsylvania was dedicated on Saturday, November 6, 1915, the 2,375-foot-long, 240-foot-high Tunkhannock Viad... More
Lover's Leap Lenticular Bridge, Spanning Housatonic River on Pumpkin H...
Significance: The structure is 19 feet wide and 173 feet long. It is the most recently built lenticular through truss surviving in Connecticut, as of 1984. It has been replaced by a new bridge built several y... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Atherton Bridge, Spanning Nashua River on Bolton Road, Lancaster, Worc...
Significance: The Atherton Bridge is an example of a hybrid pony-truss that bears a similarity to the Post truss. The bridge is 72 feet long, 18 1/2 feet wide, and is comprised of eight panels. It rests on gr... More
Ponakin Road Bridge, Spanning Nashua River on Ponakin Road, Lancaster,...
Significance: The single span Ponakin Road Bridge is 100 feet long and 20 feet wide, with vertical end posts. The bridge has diagonal compression members and diagonal eye-bar tension members that extend two pa... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More
Golden Gate Bridge, Spanning mouth of San Francisco Bay, San Francisco...
Significance: Spanning one of the World's most spectacular channels, the Golden Gate Bridge is internationally renowned as a superb structural and aesthetic example of suspension bridge design. Survey number: ... More