Scenic Bridge

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Scenic Bridge
Scenic Bridge, Spanning Clark Fork at Old Highway 10, Tarkio vicinity (Mineral County, Montana).jpg
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LocationMilepost 0 on Old U.S. Route 10 W., about 4 miles east of Tarkio, Montana
Coordinates 47°01′12.4″N114°39′25.5″W / 47.020111°N 114.657083°W / 47.020111; -114.657083 Coordinates: 47°01′12.4″N114°39′25.5″W / 47.020111°N 114.657083°W / 47.020111; -114.657083
Area2 acres (0.81 ha)
Built1928
Built byWilliam P. Roscoe Company
Architectural stylePratt Deck Truss
MPS Montana's Historic Steel Truss Bridges
NRHP reference No. 09001183 [1]
Added to NRHPJanuary 4, 2010

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

It is a riveted Pratt deck truss bridge constructed in 1928. It has three main spans upon reinforced concrete abutments and piers. It 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. The bridge 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]

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References

  1. 1 2 "National Register Information System". National Register of Historic Places . National Park Service. July 9, 2010.
  2. 1 2 3 Jon Axline (May 13, 2009). "National Register of Historic Places Registration: Scenic Bridge / 24MN304, MDT No. L31012000+08". National Park Service . Retrieved September 6, 2017.