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Hawkeye Creek Bridge

Photos 

Iowa Department of Transportation

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BH Photo #270768

Map 

Description 

This short-span through truss carries a gravel-surfaced road over Hawkeye Creek northeast of Mediapolis. The bridge consists of a single rigid-connected Pratt through truss, supported by concrete abutments. The Hawkeye Creek Bridge dates to 1909. On September 23rd of that year the Des Moines County Board of Supervisors contracted with the Clinton Bridge and Iron Works for this 80-foot span and two other, smaller steel structures. Presumably completed the following year, the Hawkeye Creek Bridge has carried vehicular traffic since, in essentially unaltered condition. When this bridge was let for bids in 1909, the Iowa State Highway Commission had not yet begun standardizing bridge design in the state. This left counties such as Des Moines to depend, as they had for decades before, largely on the bridge companies themselves for both engineering and construction. Firms such as the Clinton Bridge and Iron Works relied almost exclusively on pin-connected trusses up until about 1910, when they began to use riveted trusses as well. With its riveted Pratt through truss, the Hawkeye Creek Bridge was built during this transitional period between independently designed, rigid-connected trusses and ISHC standard design spans. It resembled the 1914 state standards in design but differed slightly in detail, indicative of its independent source. It is thus technologically significant as one of the few of the pre-ISHC riveted through trusses, the oldest example of its type in Iowa [adapted from Crow-Dolby and Fraser 1992].

Facts 

Overview
Through truss bridge over Hawkeye Creek on Hawkeye Road
Location
Des Moines County, Iowa
Status
Open to traffic
History
Built 1910 by the Clinton Bridge & Iron Works
Builder
- Clinton Bridge & Iron Works of Clinton, Iowa
Design
Pratt through truss
Dimensions
Span length: 81.0 ft.
Total length: 81.0 ft.
Deck width: 15.7 ft.
Vertical clearance above deck: 11.8 ft.
Recognition
Posted to the National Register of Historic Places on June 25, 1998
Approximate latitude, longitude
+41.04251, -91.05774   (decimal degrees)
41°02'33" N, 91°03'28" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/663246/4545293 (zone/easting/northing)
Quadrangle map:
Oakville
Land survey
T. 72 N., R. 2 W., Sec. 14
Inventory numbers
NRHP 98000790 (National Register of Historic Places reference number)
IA 144120 (Iowa bridge number)
BH 13395 (Bridgehunter.com ID)
Inspection (as of 09/2015)
Deck condition rating: Poor (4 out of 9)
Substructure condition rating: Serious (3 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 21.2 (out of 100)
Average daily traffic (as of 2014)
10

Update Log 

  • April 2, 2017: New photo from Luke
  • March 25, 2015: Updated by Dave King: Added categories "Lattice Railing", "A-frame portal"
  • November 20, 2013: New photo from Luke Harden
  • September 8, 2011: Updated by Luke Harden: added description and photograph