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
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
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
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Sloss-Sheffield Steel & Iron, First Avenue North Viaduct at Thirty-sec...
STORED OFF SITE AND ON SITE. mchr Significance: The Sloss Company's city furnaces, built in what is now the center of Birmingham, Alabama, in 1881-1882, produced pig iron for the foundry market until their clos... More
Holyoke Bridge, Spanning Connecticut River, between Holyoke & South Ha...
Significance: The Holyoke Bridge is significant as one of Massachusetts' few known examples of the riveted lattice truss bridge, a type most commonly associated with railroad construction in the latter half of ... More
Sibley Manufacturing Company, 1717 Goodrich Street, Augusta Canal, Aug...
Significance: Located on the Augusta Canal, one of the few remaining power canals in the country, the Sibley mill continuously has used the canal to generate its own power; at present, it supplies between 50% a... More
Sibley Manufacturing Company, 1717 Goodrich Street, Augusta Canal, Aug...
Significance: Located on the Augusta Canal, one of the few remaining power canals in the country, the Sibley mill continuously has used the canal to generate its own power; at present, it supplies between 50% a... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Kennecott Copper Corporation, On Copper River & Northwestern Railroad,...
Significance: Kennecott's significance lies in its quality, as well as quantity, of high grade ore. The mine also illustrates the history of world and U.S. copper between 1907 and 1938. The rise and decline o... More
Eighteenth Street Bridge, Saint Louis, Independent City, MO
Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More
Eighteenth Street Bridge, Saint Louis, Independent City, MO
Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More
Eighteenth Street Bridge, Saint Louis, Independent City, MO
Significance: The Eighteenth Street Bridge is a 1,054-foot-long through-truss and through-plate girder structure with distinctive ornamentation over each truss portal in the form of finials and cresting, and pe... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls S. U. M. Historic District, Oliver Street, Paterson, Passa...
Significance: In 1791 Alexander Hamilton and others founded an industrial venture known as the Society for the Establishment of Useful Manufactures (S.U.M.). The formation of this Society embodied the theory pr... More
Great Falls/S. U. M. Power Canal System, Paterson, Passaic County, NJ
Significance: Begun by the Society for the Establishment of Useful Manufacturers under the supervision of Pierre L'Enfant, the Canal System was first completed in 1794. Later alterations and improvements were ... More
Great Falls/S. U. M. Power Canal System, Paterson, Passaic County, NJ
Significance: Begun by the Society for the Establishment of Useful Manufacturers under the supervision of Pierre L'Enfant, the Canal System was first completed in 1794. Later alterations and improvements were ... More
Great Falls/S. U. M. Power Canal System, Paterson, Passaic County, NJ
Significance: Begun by the Society for the Establishment of Useful Manufacturers under the supervision of Pierre L'Enfant, the Canal System was first completed in 1794. Later alterations and improvements were ... More
Great Falls/S. U. M. Power Canal System, Paterson, Passaic County, NJ
Significance: Begun by the Society for the Establishment of Useful Manufacturers under the supervision of Pierre L'Enfant, the Canal System was first completed in 1794. Later alterations and improvements were ... More
San Juan & New York Mining & Smelting Company, Smelter Stack, State Ro...
Significance: The extant smelter stack is the first of two identical stacks at the San Juan and New York Mining and Smelting Company (SJ&NY) plant in Durango. It stands at the south end of the site of the origi... More
Museum Hill, Bounded by Jules, Sixteenth, Messanie & Ninth Streets, Sa...
Significance: Museum Hill is a distinct residential area of St. Joseph, Missouri, that has architecturally significant buildings and historically relates to growth of the city. The area is significant in the h... More
Museum Hill, Bounded by Jules, Sixteenth, Messanie & Ninth Streets, Sa...
Significance: Museum Hill is a distinct residential area of St. Joseph, Missouri, that has architecturally significant buildings and historically relates to growth of the city. The area is significant in the h... More
Coldwater Bridge, Spanning Coldwater Creek on Old Railroad Bed Road, F...
Significance: The bridge derives its significance as an unusual example of the pony Warren truss type. The bridge also possesses historical significance in Lincoln County transportation (railroad) history. Sur... More
Dundee Canal, Headgates, Guardlock & Uppermost Section, 250 feet north...
Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description
Dundee Canal, Headgates, Guardlock & Uppermost Section, 250 feet north...
Picryl description: Public domain image of a great depression era, migrant workers, free to use, no copyright restrictions.
Utah Sugar Company, Garland Beet Sugar Refinery, Factory Street, Garla...
Significance: The history of the beet sugar industry in Utah began at the Lehi Plant of the Utah Sugar Company. In that plant on 15 October 1891, Edward Dyer reached into a whirling centrifugal and withdrew a h... More
Plaza House, 507-511 North Main Street, Los Angeles, Los Angeles Count...
Significance: Designed by the architectural firm of Kysor & Morgan, it is significant for its historical and architectural contribution to the evolution of the El Pueblo de Los Angeles, the original City of Los... More
Augusta Water Works, Goodrich Street extension, Augusta Canal, Augusta...
Significance: When completed in 1899, the Augusta Water Supply system was one of the best in the South and one of the cheapest in the United States. The Raw Water Pumping Stations have always pumped canal wate... More
Morris Canal, Cassedy's Store, Waterloo, Sussex County, NJ
Significance: A.L. Cassedy's Store at Waterloo is a well preserved example of a mid 19th century structure built along the Morris Canal. Survey number: HAER NJ-29-K Building/structure dates: ca. 1830 Initial ... More
Enterprise Manufacturing Company, 1450 Greene Street, Augusta Canal, A...
Significance: The Granite Mill, built shortly after the completion of the original canal, is the oldest industrial building in Augusta. The later Enterprise Manufacturing Company was the first large-scale mill... More
Enterprise Manufacturing Company, 1450 Greene Street, Augusta Canal, A...
Significance: The Granite Mill, built shortly after the completion of the original canal, is the oldest industrial building in Augusta. The later Enterprise Manufacturing Company was the first large-scale mill... More
Havemeyer-Willcox Canal System, Rifle, Garfield County, CO
Significance: The canal system is an example of a turn-of-the-century irrigation project linked with a period of intensive development of the Colorado Western Slope. The system is a distinctive example of turn-... More
Havemeyer-Willcox Canal System, Rifle, Garfield County, CO
Significance: The canal system is an example of a turn-of-the-century irrigation project linked with a period of intensive development of the Colorado Western Slope. The system is a distinctive example of turn-... More
Trinidad Foundry & Machine Company, Goddard Avenue, Trinidad, Las Anim...
Significance: It is a four building industrial complex associated with the early industrial development of Trinidad. The foundry complex is representative of a distinctive industrial architectural type which wa... More
Hoboken Piers Headhouse, River Street at Hudson River, Hoboken, Hudson...
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
Hoboken Piers Headhouse, River Street at Hudson River, Hoboken, Hudson...
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
Burton Road Bridge, Spanning Little Weiser River, Cambridge, Washingto...
Significance: One of only a few Idaho bridges built by prominent western contractor Charles G. Sheely. One of the first steel bridges in Washington County and may have set standards for local steel bridge buil... More
Burton Road Bridge, Spanning Little Weiser River, Cambridge, Washingto...
Significance: One of only a few Idaho bridges built by prominent western contractor Charles G. Sheely. One of the first steel bridges in Washington County and may have set standards for local steel bridge buil... More
Burton Road Bridge, Spanning Little Weiser River, Cambridge, Washingto...
Significance: One of only a few Idaho bridges built by prominent western contractor Charles G. Sheely. One of the first steel bridges in Washington County and may have set standards for local steel bridge buil... More
Fifth Street Bridge, U.S. 50 at Colorado River, Grand Junction, Mesa C...
Survey number: HAER CO-41 Public domain photograph - historical image of Colorado, United States, free to use, no copyright restrictions image - Picryl description
Tivoli-Union Brewery, 1320-1348 Tenth Street, Denver, Denver County, C...
Significance: One of the largest gravity fed breweries in the United States. Survey number: HAER CO-1 Building/structure dates: ca. 1879 Initial Construction Building/structure dates: 1882 Subsequent Work B... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Strawberry Valley Project, Payson, Utah County, UT
Significance: As the first project built by the U.S. Reclamation Service in Utah, the Strawberry Valley Project had a major impact on the State. It represents the beginning of Federal assistance in water devel... More
Bridge Street Bridge, Spanning Grand River, Michigan & Bridge Streets,...
Significance: The Bridge Street Bridge is a rare example of a reinforced concrete arch, earth-filled bridge, and one of great size, measuring 468 feet long overall. This bridge is the second largest known surv... More
Sanders Ferry Bridge, State Highway 184, Spanning Savannah River, Iva,...
Significance: The Sanders Ferry Bridge was built jointly by Elbert County, Georgia and Anderson County, South Carolina. Built by the Austin Bridge Company of Atlanta, the Anderson-Elberton Free Bridge was form... More
Delaware Street Tramway Power Sub-Station, 1448 Delaware Street, Denve...
Significance: It is significant for its association with the growth and development of Denver's tramway trolley system, a major transportation system during the first half of the 20th century. This substation w... More
Delaware Street Tramway Power Sub-Station, 1448 Delaware Street, Denve...
Significance: It is significant for its association with the growth and development of Denver's tramway trolley system, a major transportation system during the first half of the 20th century. This substation w... More
Delaware Street Tramway Power Sub-Station, 1448 Delaware Street, Denve...
Significance: It is significant for its association with the growth and development of Denver's tramway trolley system, a major transportation system during the first half of the 20th century. This substation w... More
Snake River Valley Irrigation District, East Side of Snake River (Rive...
Significance: The Snake River Valley Irrigation District is an example of an early irrigation district that was formed to provide more effective management of the Cedar Point, Snake River Valley, West Branch, ... More
Snake River Valley Irrigation District, East Side of Snake River (Rive...
Significance: The Snake River Valley Irrigation District is an example of an early irrigation district that was formed to provide more effective management of the Cedar Point, Snake River Valley, West Branch, ... More
Snake River Valley Irrigation District, East Side of Snake River (Rive...
Significance: The Snake River Valley Irrigation District is an example of an early irrigation district that was formed to provide more effective management of the Cedar Point, Snake River Valley, West Branch, ... More
Snake River Valley Irrigation District, East Side of Snake River (Rive...
Significance: The Snake River Valley Irrigation District is an example of an early irrigation district that was formed to provide more effective management of the Cedar Point, Snake River Valley, West Branch, ... More
Zanja No. 3, Brick Culvert, Alameda Street between Temple & Aliso Stre...
Significance: Zanja No. 3 represents a portion of the original Los Angeles water system. The zanjas, a series of ditches from the Los Angeles River, were begun immediately after the establishment of the pueblo... More
Goodyear Rubber Company, 6701 South Central Avenue, Los Angeles, Los A...
Significance: Goodyear Rubber Company was the first tire manufacturing company on the West Coast. By the mid-1920's, other tire companies followed Goodyear's lead and established facilities on the West Coast. ... More
Patch Street Bridge, Spanning Kohanza Brook on Patch Street, Danbury, ...
Significance: The single arch stone Patch Street Bridge was a typical example of an increasingly rare class of municipally-built structure in Connecticut, and was the best preserved and perhaps most unusual suc... More
Commercial Street Bridge, Spanning Purgatoire River on Commercial Stre...
Significance: After the turn of the century, the preferred alternative to the steel truss for short-span vehicular bridges was generally considered to the concrete arch. More solid under traffic and better resi... More
South Broad Street Bridge, Spanning Elizabeth River, Elizabeth, Union ...
Picryl description: Public domain image of an arch bridge, stone structure, architecture, free to use, no copyright restrictions.
Eagle & Phenix Mills, Front Street (1200-1300 Blocks), Columbus, Musco...
STORED OFF SITE AND ON SITE. mchr Significance: From its inception in 1851 the dynamic growth of the Eagle Mill represented the most important factor in Columbus's industrial development. In 1860 the Eagle Mil... More
Eagle & Phenix Mills, Front Street (1200-1300 Blocks), Columbus, Musco...
STORED OFF SITE AND ON SITE. mchr Significance: From its inception in 1851 the dynamic growth of the Eagle Mill represented the most important factor in Columbus's industrial development. In 1860 the Eagle Mil... More
Eagle & Phenix Mills, Front Street (1200-1300 Blocks), Columbus, Musco...
STORED OFF SITE AND ON SITE. mchr Significance: From its inception in 1851 the dynamic growth of the Eagle Mill represented the most important factor in Columbus's industrial development. In 1860 the Eagle Mil... More
Eagle & Phenix Mills, Front Street (1200-1300 Blocks), Columbus, Musco...
STORED OFF SITE AND ON SITE. mchr Significance: From its inception in 1851 the dynamic growth of the Eagle Mill represented the most important factor in Columbus's industrial development. In 1860 the Eagle Mil... More
Augusta Canal, Augusta, Richmond County, GA
Significance: The Augusta power and navigation canal was projected in order to make Augusta a manufacturing center. By the 1880's, the canal was a success. It supplied water power for eight textile mills, thr... More
Augusta Canal, Augusta, Richmond County, GA
Significance: The Augusta power and navigation canal was projected in order to make Augusta a manufacturing center. By the 1880's, the canal was a success. It supplied water power for eight textile mills, thr... More
Butte Historic District, Bounded by Copper, Arizona, Mercury & Contine...
Picryl description: Public domain image of a department store, commercial building, downtown, shopping center, 19th-20th century, free to use, no copyright restrictions.
Butte Historic District, Bounded by Copper, Arizona, Mercury & Contine...
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
Butte Historic District, Bounded by Copper, Arizona, Mercury & Contine...
Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description
Butte Historic District, Bounded by Copper, Arizona, Mercury & Contine...
Picryl description: Public domain photograph of a narrow passage, corridor, street, old town architecture, arch, vintage print, free to use, no copyright restrictions.
Techwood Homes (Public Housing), Bounded by North Avenue, Parker Stree...
Significance: The first federally funded housing project in the United States, Techwood Homes represents the first large-scale attempt to eradicate slum housing in a socially humanitarian way in this country. T... More
Techwood Homes (Public Housing), Bounded by North Avenue, Parker Stree...
Significance: The first federally funded housing project in the United States, Techwood Homes represents the first large-scale attempt to eradicate slum housing in a socially humanitarian way in this country. T... 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
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More
Burlington Northern Railroad Bridge, Spanning Willamette River at Rive...
Significance: Willamette River Bridge 5.1 is the south end part of a 4-3/4 mile-long network of railroad bridges, causeways, and cut system linking the mainlines north and south of Portland. The bridge is one ... More