UP 20th Street Bridge (Omaha)


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Name UP 20th Street Bridge (Omaha)
Union Pacific Railroad Bridge #3.76
Built By Union Pacific Railroad
Currently Owned By Union Pacific Railroad
Superstructure Contractor Lassig Bridge & Iron Works of Chicago
Length 68 Feet Total, 21 Foot Main Spans
Width 6 Tracks, 4 In Use
Height Above Ground 12 Feet 4 Inches
Superstructure Design Deck Plate Girder
Substructure Design Concrete and Steel Bent
Date Built 1890, Center Pier Added c. 1930
Traffic Count 20 Trains/Day (Estimated)
Current Status In Use
Union Pacific Railroad Bridge Number 3.76
Significance Moderate Significance
Documentation Date 1/27/2017

In 1862, United States President Abraham Lincoln signed the Union Pacific Charter, declaring a railroad would be built west from Omaha, to a point on the West Coast at San Francisco.  Construction on the Union Pacific Railroad began in Omaha in 1865, with construction of a line extending south of Omaha, to Bellevue, Nebraska; where the line would turn west and extend to Millard.  The railroad then headed northwest to Fremont, Nebraska, being completed in December of that year.  The railroad then turned west along the Platte River Valley.  By the end of 1866, the railroad had reached North Platte, Nebraska; extending through the towns of Columbus, Grand Island and Kearney.  Some 240 miles of new railroad were constructed in 1866.  Work continued the following spring, reaching Cheyenne, Wyoming by the end of the year, some 500 miles west of Omaha.  Work continued westwards in 1868 and 1869, with the line meeting the Central Pacific Railroad at Promontory Point, Utah in 1869. 

This route became the backboke of the Union Pacific Railroad, known as the Overland Route.  A bridge was completed into Council Bluffs in 1872, where the line linked with the heavily used Chicago & North Western Railway mainline to Chicago.  Numerous revisions were made to the route throughout the 19th and 20th Centuries.  Much of the route was double tracked between 1900 and 1917, and the railroad was realigned in Omaha.  A new cutoff was constructed, bypassing the original route between Omaha and Millard.  The original route between Omaha and Millard was utilized as a secondary route.  The route between Paillion and Bellevue was abandoned in 1989, and two more miles on the west end were abandoned in 1994.  The original line was further abandoned in 2004, when the line was abandoned to Millard.  In 2024, Union Pacific continues to operate this line, and it handles considerable traffic.  Portions of the original line around Omaha have became a trail.  Union Pacific currently operates the Omaha Subdivision between Omaha and Fremont, the Columbus Subdivision between Fremont and Grand Island, the Kearney Subdivision between Grand Island and North Platte, and the Sidney Subdivision from North Platte to Cheyenne. 


Located in Omaha, this deck girder bridge is the northern of two bridges across 20thth Street. Prior to the construction of this bridge, a grade crossing existed at this location. Grade crossings were both a hazard and nuisance to the public, and by the end of the 19th Century, cities throughout the United States were passing ordinances to replace such crossings with overpasses or underpasses. In 1890, the City of Omaha desired the construction of a grade separation at 20th Street, resulting in the construction of the current bridge that year. This was a relatively early example of a grade separation in the United States. The bridge was initially constructed with one 42-foot and two 13-foot deck plate girder spans, although the bridge was repaired in approximately 1930, and a center pier added. Currently, the bridge consists of two 21-foot and two 13-foot deck plate girder spans, set onto concrete abutments and steel bent piers. The outside girder of bridge runs at a heavy skew, although the remaining girders are not skewed. The bridge uses a ballasted deck, typical of grade separations throughout the United States. This design of bridge was commonly used by railroads throughout the United States, as it was durable and easy to construct. Various repairs have been made to the bridge, including the addition of the center bent to create two spans from the original 42-foot span, as well as significant repairs to the abutments. It is unknown if the original abutments used stone, as concrete use would have been exceptionally rare in 1890. Overall, the bridge appears to be in fair to good condition, with no significant deterioration noted. The author has ranked this bridge as being moderately significant, due to the old age and common design.


Citations

Builder and build date Lassig Bridge & Iron Works plaque
Railroad History Citation ICC Valuation Information, Compiled by Richard S. Steele

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