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Buck Creek Bridge

Photo 

Iowa Department of Transportation

Enlarge

BH Photo #270811

Map 

Description 

During World War II the War Department developed a "Priorities Critical List" of materials deemed essential to the war effort. As a component of almost every major piece of war materiel, steel was, of course, included on the list , making the construction of steel bridges problematic for Iowa's counties. In response, most of the counties reverted to timber construction for their small-scale bridges, and timber pile bridges outnumbered all other types by a substantial margin in the 1940s. Crawford County, too, relied on timber construction, until heavy flooding in May 1945 washed out 27 bridges and culverts in the county. The county board of supervisors resolved to build new bridges using emergency funds, purchasing several steel superstructures from the Des Moines Steel Company as replacement spans. These structures featured a bowstring arch-truss configuration, with the upper chord in compression and the lower chord in tension to resist the springing action of the curved upper chord (although the all-riveted construction made this action structurally indeterminate). The trusses employed only small-profile steel angles for the web members. They employed angled gusset plates to which the vertical and diagonal members were riveted to the chords. Each web was fabricated in the shop in two halves and field-bolted at the site by a county work force. The trusses were carried by relatively simple bearing shoes, and angle outriders provided lateral support for the truss webs. The Buck Grove Bridge, located over Buck Creek in the town of Buck Grove, was one of several such hybrid trusses build by Crawford County during the war years. Comprised of the riveted truss, supported by a timber substructure, the Buck Grove Bridge remains in unaltered condition today. It, like the five other, almost identical spans that remain in Crawford County, is a noteworthy example of wartime bridge construction in Iowa [adapted from Fraser 1993].

Facts 

Overview
Pony truss bridge over Buck Creek on Buck Creek Avenue in Buck Grove
Location
Buck Grove, Crawford County, Iowa
Status
Closed to thru traffic; privately owned
History
Built 1945; Rehabilitated 1973
Builders
- Des Moines Steel Co. of Des Moines, Iowa
- H. Gene McKeown of Council Bluffs
Design
Bowstring pony truss
Dimensions
Length of largest span: 68.9 ft.
Total length: 69.9 ft.
Deck width: 15.4 ft.
Recognition
Eligible for the National Register of Historic Places
Approximate latitude, longitude
+41.91628, -95.39289   (decimal degrees)
41°54'59" N, 95°23'34" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/301560/4643249 (zone/easting/northing)
Quadrangle map:
Dow City
Land survey
T. 82 N., R. 39 W., Sec. 16
Average daily traffic (as of 2012)
40
Inventory numbers
IA 126675 (Iowa bridge number)
BH 13233 (Bridgehunter.com ID)
Inspection report (as of April 2015)
Overall condition: Poor
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 20.8 (out of 100)
View more at BridgeReports.com

Update Log 

  • November 22, 2013: New photo from Luke Harden
  • September 1, 2013: Updated by Luke Harden: Added type
  • April 27, 2013: Updated by Luke Harden: Added city
  • February 22, 2012: Updated by Jason Smith: Readjusted the GPS coordinates on this bridge; appears to be privately owned
  • May 5, 2010: Updated by J.R. Manning: Added Road Name

Sources 

  • Historic Bridges of Iowa - Buck Creek Bowstring Truss Bridge
  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • Jason Smith - flensburg [dot] bridgehunter [dot] av [at] googlemail [dot] com
  • Luke