Otter Creek Bridge

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40th St. over Otter Cr., Oelwein, Iowa

Concrete girder bridge over Otter Creek on 40th Street

Photos 

Oblique View Looking Northeast

The photos do not do justice to the massive size of these girders.

Photo taken by J.R. Manning in June 2012

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Map 

Description 

Located northwest of Oelwein, in Jefferson Township, this medium-span concrete bridge carries a gravel-surfaced county road over Otter Creek. The bridge is comprised of two through girder spans, with reinforced concrete substructure, deck and guardrails that double as the girders. The Otter Creek Bridge dates to 1917. In July of that year the Fayette County Board of Supervisors approved the bridge's design by the state highway commission and solicited competitive bids for its construction. When no bids were received, the county resorted to using day laborers to build the structure for a cost of $5,153.38. Since its completion in 1917, the Otter Creek Bridge has functioned in place, in unaltered condition. "Fayette County has pinned considerable faith to the day laborer system of bridge and culvert building and has made good," the state highway commission reported. "This is contrary to the general experience of Iowa counties with day labor work." Among the structural types that the county employed during this period of intense bridge construction was the concrete through girder. Carrying the roadway deck between the two structural beams, the through girder bridge was one of the first standard designs developed by the state highway commission after its re-organization in 1913. Several of Iowa's counties built through girder bridges in the 1910s. The advantage of this structural type was that it required less clearance between the roadway and the high water mark than did the deck girder. Its disadvantages were that it required slightly more material than the deck girder and it was not as flexible: with the structural members above the deck, the through girder could not be widened later. Ultimately the disadvantages outweighed the advantages, and the through girder was phased out of common use in Iowa by the early 1920s. Most of the state's through girders are relatively short, single-span structures over minor watercourses. A handful of two-span girders remains in Fayette County, however, of which the Otter Creek Bridge is a well-preserved example. It is a typically configured example of ISHC standard concrete through girder design, distinguished somewhat by its two-span configuration [adapted from Fraser 1992].

National Register information 

Status
Posted to the National Register of Historic Places on June 25, 1998
Reference number
98000781
Architectural style
Other architectural type; Concrete through girder
Area of significance
Engineering
Level of significance
State
Evaluation criteria
C - Design/Construction
Property type
Structure
Historic function
Road-related
Current function
Road-related
Period of significance
1900-1924
Significant year
1917

Update Log 

  • June 10, 2012: Updated by J.R. Manning: Added description, updated status and uploaded photos.
  • June 10, 2012: New photos from J.R. Manning

Sources