St. Louis-San Francisco Overpass

The St. Louis-San Francisco Overpass is a pony and deck truss bridge built in 1937 in Imboden, Arkansas. It carries U.S. Route 62 and Arkansas Highway 115 over the Spring River and the former St. Louis-San Francisco Railroad ("Frisco", now BNSF) for 1,049.9 feet (320.0 m).^[2] The bridge has three Pratt deck trusses, each 112 feet (34 m) in length, and three Parker pony trusses, also 112 feet (34 m) long, with the balance of the bridge length in steel girder truss spans. The bridge is 24 feet (7.3 m) wide.^[3]

Imboden Bridge
St. Louis-San Francisco Bridge
Coordinates	36°12′21″N 91°10′19″W
Carries	US 62 / AR 115
Crosses	Spring River
Locale	Imboden, Arkansas
Official name	St. Louis-San Francisco Overpass
Maintained by	Arkansas Department of Transportation
ID number	AHTD 1984
Characteristics
Design	Concrete deck girder approach spans (both sides); three riveted, 11-panel Pratt deck trusses; three riveted, 11-panel Parker pony trusses
Total length	1,049.9 feet (320.0 m)
Width	2 lanes, 23.9 feet (7.3 m)
Longest span	112 feet (34 m)
History
Opened	1937
St. Louis-San Francisco Overpass
U.S. National Register of Historic Places
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Location in Arkansas Show map of Arkansas Location in United States Show map of the United States
Nearest city	Imboden, Arkansas
Area	Lawrence County
Built	1937
Architect	C. F. Lytle
MPS	Historic Bridges of Arkansas
NRHP reference No.	90000513[1]
Added to NRHP	April 9, 1990
Statistics
Daily traffic	2,800
Location

The bridge was listed on the National Register of Historic Places in 1990.^[1] The bridge is currently open to two-lane traffic. It has a separate pedestrian sidewalk.

See also

• List of bridges documented by the Historic American Engineering Record in Arkansas
• List of bridges on the National Register of Historic Places in Arkansas
• National Register of Historic Places listings in Lawrence County, Arkansas