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Mott Bridge

Douglas County, Oregon
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Mott Bridge

Photo taken by Michael Goff in July 2011

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View Uglybridges.com report

Facts 

Overview
Timber braced spandrel arch bridge over North Umpqua River on USFS Road 4712
Location
Douglas County, Oregon
Status
Open to traffic
History
Built 1936; rehabilitated 1983
Builder
- Civilian Conservation Corps (Builder)
Design
The Mott Bridge over the North Umpqua River is located about 40 miles east of Roseburg off of OR-138. The 237-foot structure features a 135-foot three hinged braced spandrel timber arch main span, along with 50-foot approach timber trestles on each approach.
The rustic bridge carries traffic over the North Umpqua River on a 14.5-foot roadway and two 4-foot sidewalks. The bridge links OR-138 to the popular North Umpqua Trail as well as supplies access to the Forest Service and Oregon Department of Transportation maintenance yards on the opposite side to the river.
The timber bridge was built by the Civilian Conservation Corps in 1936, and is the last remaining three hinged timber arch of the three similar structures built in the Pacific Northwest during the Great Depression.
Dimensions
Length of largest span: 134.8 ft.
Total length: 236.9 ft.
Deck width: 14.4 ft.
Also called
North Umpqua River Bridge
Approximate latitude, longitude
+43.34287, -122.73489   (decimal degrees)
43°20'34" N, 122°44'06" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/521488/4798925 (zone/easting/northing)
USGS topographic map
Steamboat
Inventory number
BH 29954 (Bridgehunter.com ID)
Inspection (as of 08/2011)
Deck condition rating: Good (7 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 49.0 (out of 100)

Categories 

Arch (9,419)
Built 1936 (746)
Built during 1930s (8,552)
Civilian Conservation Corps (49)
Deck arch (8,702)
Douglas County, Oregon (66)
Have street view (9,909)
North Umpqua River (7)
Open (28,322)
 Oregon (689)
Owned by National Forest Service (132)
Owned by federal government (590)
Span length 125-175 feet (2,957)
Timber arch (17)
Timber truss (4)
Total length 175-250 feet (2,791)
Umpqua River (22)

Update Log 

  • August 2, 2011: New photo from Michael Goff
  • March 21, 2011: New photos from Michael Goff
  • April 20, 2010: New Street View added by Michael Goff
  • June 19, 2008: Updated by Michael Goff

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Comments 

Mott Bridge
Posted August 2, 2011, by Michael Goff (michael [dot] goff [at] odot [dot] state [dot] or [dot] us)

From what I have found there are only three exposed timber truss vehicular structures remaining in Oregon.

Mott Bridge - http://www.bridgehunter.com/or/douglas/mott/

Middle Fork Willamette River Bridge - http://www.bridgehunter.com/or/lane/61805000001742/

Cascadia Park Bridge - http://www.bridgehunter.com/or/linn/17350016F04141/

I am always on the lookout for these rare timber structures, but like you said they are disappearing at an alarming rate.

Mott Bridge
Posted August 2, 2011, by Anonymous

Michael, great find here. Timber bridges are getting pretty rare in the West and this one is interesting.