Scenic Bridge

Scenic Bridge
U.S. National Register of Historic Places
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Location	Milepost 0 on Old U.S. Route 10 West, about 4 miles (6.4 km) east of Tarkio, Montana
Coordinates	47°01′12.4″N 114°39′25.5″W / 47.020111°N 114.657083°W / 47.020111; -114.657083
Area	2 acres (0.81 ha)
Built	1928
Built by	William P. Roscoe Company
Architectural style	Pratt deck truss
MPS	Montana's Historic Steel Truss Bridges
NRHP reference No.	09001183[1]
Added to NRHP	January 4, 2010

The Scenic Bridge crossing Clark Fork River about 4 miles (6.4 km) east of Tarkio in Mineral County, Montana, was built in 1928. It is located at Milepost 0 on Old U.S. Route 10 West. The bridge has also been denoted 24MN304 and MDT No. L31012000+08.^[2] It was listed on the National Register of Historic Places in 2010.^[1]

The bridge is a riveted Pratt deck truss bridge constructed in 1928. It has three main spans upon reinforced concrete abutments and piers. The bridge is 421 feet (128 m) long in total, with four 19 feet (5.8 m) approach spans, two 77 feet (23 m) deck truss spans, and a 191 feet (58 m) deck truss main span. It is 25 feet (7.6 m) wide, supporting a 24 feet (7.3 m) roadway.^[2]

This Pratt deck truss design is visually pleasing and rare. It was chosen by state staff for relatively rare circumstances during 1928 to 1932, after which a version of a Warren truss design was used.^[2]

• List of bridges documented by the Historic American Engineering Record in Montana
• List of bridges on the National Register of Historic Places in Montana

• Historic American Engineering Record (HAER) No. MT-122, "Scenic Bridge, Spanning Clark Fork at Old Highway 10, Tarkio, Mineral County, MT", 10 photos, 18 data pages, 91 photo caption pages