6 votes

Mott Bridge


Mott Bridge

Photo taken by Michael Goff in July 2011


BH Photo #206678

Street View 


Timber braced spandrel arch bridge over North Umpqua River on USFS Road 4712
Douglas County, Oregon
Open to traffic
Built 1936; rehabilitated 1983
- Civilian Conservation Corps (Builder)
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.
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)
Quadrangle map:
Average daily traffic
Inventory number
BH 29954 (Bridgehunter.com ID)
Inspection report (as of July 2018)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Good (7 out of 9)
Sufficiency rating: 62.3 (out of 100)
View more at BridgeReports.com

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

Related Bridges 



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.