Revetment work on the Missouri River, the grader, Cambridge, Mo
Date based on Detroit, Catalogue J Supplement (1901-1906). "828" on negative. Detroit Publishing Co. no. 013771. Gift; State Historical Society of Colorado; 1949.
Revetment work on the Missouri River, the mat, Cambridge, Mo
Date based on Detroit, Catalogue J Supplement (1901-1906). Detroit Publishing Co. no. 013774. Gift; State Historical Society of Colorado; 1949.
Sinking the mat, revetment work on the Missouri River, Cambridge, Mo
Date based on Detroit, Catalogue J Supplement (1901-1906). Detroit Publishing Co. no. 013775. Gift; State Historical Society of Colorado; 1949.
Revetment work on the Missouri River, weaving the mat, Cambridge, Mo
Date based on Detroit, Catalogue J Supplement (1901-1906). Detroit Publishing Co. no. 013772. Gift; State Historical Society of Colorado; 1949.
Revetment work on the Missouri River, tightening the cable, Cambridge,...
Date based on Detroit, Catalogue J Supplement (1901-1906). Detroit Publishing Co. no. 013773. Gift; State Historical Society of Colorado; 1949.
![[Crane, owned by the District of Columbia Water Department, Washington, D.C., being used to lay pipe]](https://cdn4.picryl.com/photo/2019/09/09/crane-owned-by-the-district-of-columbia-water-department-washington-dc-being-dc5a40-640.jpg "[Crane, owned by the District of Columbia Water Department, Washington, D.C., being used to lay pipe]")
[Crane, owned by the District of Columbia Water Department, Washington...
National Photo Company Collection.
Erie Railway, New York Division, Bridge 8.04 (c.1900), Spanning Passai...
Survey number: HAER NJ-25-B
Deerfield Bridge, Spanning Judith River, Danvers, Fergus County, MT
Significance: At the turn of the 20th century, the Judith Basin was rapidly becoming one of the most bountiful wheat producing areas in Montana. During the decades that followed, there was a great expansion of ... more
Lehigh Canal, Monocacy Creek Aqueduct, Lehigh Canal across Monocacy Cr...
Significance: One of four aqueducts constructed by the Lehigh Coal and Navigation Company in 1829. Although the other three made use of wooden troughs on stone abutments and piers, the Monocacy Creek Aqueduct,... more
Chesapeake & Ohio Canal, Lock No. 63 1/3, State Route 51 Vicinity, Tow...
Unprocessed Field note material exists for this structure: FN-5 Survey number: HAER MD-30-A Building/structure dates: HAER MD-30-A
Turn-of-River Bridge, Spanning Rippowam River on Old North Stamford Ro...
2013 Leicester B. Holland Prize, First Place Significance: With the exception of Gustav Lindenthal's Smithfield Street Bridge in Pittsburgh, PA, The Berlin Iron Bridge Company was the only manufacturer of lenti... more
Lehigh Canal, Lock 44, North end of Freemansburg Borough, Freemansburg...
Significance: The lock was constructed in 1829 by the Lehigh Coal and Navigation Company. The adjacent two and one-half story lockhouse (title is in dispute at present) is believed to be the last original lock... more
Lehigh Canal, Hokendauqua Dam, Lehigh River 300 feet north of Hokendau...
Significance: 416 foot stone and timber crib dam with an effective height of 6.9 feet, impounding a slackwater pool 2000 yards upstream to the outlet lock of Section Five. Originally built in 1829, the dam has... more
Lehigh Canal, Lock 40, Lehigh Canal where River & Canal turn North, Al...
Significance: 22 by 100 foot lock constructed in 1829 by the Lehigh Coal and Navigation Company. The second of eight locks in the long 11.1 mile Section Seven between Dam 7, a half mile to the north, and the o... more
Conrail Bridge, Spanning Hackensack River, Kearny, Hudson County, NJ
Significance: This structure is one of a series of bridges constructed in the early twentieth century to carry railroad lines through northern New Jersey towards New York City. It is a vertical lift bridge, bu... more
Lehigh Canal, Lock 25, 800 feet south of Walnutport-Slatington Bridge,...
Significance: 22 by 100 foot lock constructed by the Lehigh Coal and Navigation Company. The third of seven locks (originally eight) in the four mile Section Three between the Lehigh Gap Dam and the outlet loc... more
Fuertes Observatory, 209 Cradit Farm Drive, Ithaca, Tompkins County, N...
2011 Leicester B. Holland Prize, Entry Significance: Fuertes Astronomical Observatory, Located at Cornell University on a hill overlooking the North Shore of Beebe Lake, has provided many generations of student... more
Steel Truss Bridge, Spanning Osage River on State Highway 7, Fairfield...
Survey number: HAER MO-21
Erie Railway, Crossing Gate Tower, West side of Lincoln Street, 100 fe...
Survey number: HAER PA-47
Saddlehorn Area, 5 miles inside West entrance, Fruita, Mesa County, CO
Significance: The Saddlehorn area has local significance architecturally and historically. The architecture within the area displays elements of the National Park Service Rustic building traditions. In additi... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Erie Railway, Diverging French Creek Bridges, 2.7 miles Southeast of U...
Survey number: HAER PA-27
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
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
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Erie Railway, Diverging French Creek Bridges, 2.7 miles Southeast of U...
Survey number: HAER PA-27
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Erie Railway, Diverging French Creek Bridges, 2.7 miles Southeast of U...
Survey number: HAER PA-27
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Erie Railway, Diverging French Creek Bridges, 2.7 miles Southeast of U...
Survey number: HAER PA-27
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Erie Railway, Diverging French Creek Bridges, 2.7 miles Southeast of U...
Survey number: HAER PA-27
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Hotchkiss Bridge, Spanning North Fork River on County Road 3400, Hotch...
Significance: Erected using steel components rolled by the Lackawanna Steel Company, the Hotchkiss Bridge was a locally important crossing of the North Fork River. Built by Colorado's most prolific bridge contr... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
Cincinnati Suspension Bridge, Spanning Ohio River, Cincinnati, Hamilto...
See also HAER No. KY-20, Covington & Cincinnati Suspension Bridge, for additional documentation. Significance: At the time of its completion in 1866, the Cincinnati Suspension Bridge was the longest suspension ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
Dentville Road Bridge, Spanning Hiawassee River on Dentville Road, Ben...
Significance: The bridge is a representative example of both the through Parker and Pratt trusses. It is also significant due to its local historical associations and its association with the Joliet Bridge and ... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more
San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Fran...
Significance: The San Francisco-Oakland Bay Bridge is one of the most impressive engineering structures in the United States. It is also one of the most important transportation links in the United States, ser... more
Choate Bridge, Spanning Ipswich River at South Main Street, Ipswich, E...
Significance: The Choate Bridge is an example of early stone construction in the history of American road building. The Essex County Court voted in December, 1764 to name the bridge in honor of Col. John Choat... more