North Skunk River Bridge
Photo taken by Julie Bowers
BH Photo #216541
"After a personal investigation had been made of the site for the bridge over North Skunk River, between the counties of Poweshiek and Mahaska, the joint meeting was called at the rooms of the New Sharon Savings Bank at New Sharon, Iowa, to further discuss the matter," reported the Mahaska County Clerk in February 1919. The bridge that the two counties were contemplating would span the North Skunk River on the county line. The Iowa State Highway Commission bridge department had drawn up a 200-foot-span rigid-connected truss for the crossing late the previous year. Using the ISHC drawings, the two counties let the project out for competitive bids that spring.
The contract was let to the Iowa Bridge Company of Des Moines for a 200'x18' pin connected high truss with concrete floor, steel tubular piers, and wood approach spans, complete as per plans, for a total cost of $50,000, $40,000 of which was to be paid jointly by Poweshiek and Mahaska counties and the balance of $10,000 to be paid by citizens of New Sharon and vicinity. Iowa Bridge used a superstructure fabricated by the American Bridge Company to build the bridge, completed later in 1919. The truss carried regional traffic in this location until it was replaced by another structure on U.S. 63. The 1920 truss was later dismantled and moved south one mile to its present location, where it was re-erected on concrete abutments. It now carries county-road traffic in unaltered condition.
Why the North Skunk River Bridge was built using pinned connections instead of the riveted connections as drawn by the highway commission is not known, but it probably relates to cheaper costs for the former structural type. Today the bridge is distinguished as the longest example of its type. The subsequent move has diminished its historic significance somewhat, although in truth the new locations is only a mile form the original and both cross the North Skunk River. A well-preserved, long-span example of what - through more recent attrition - has become a relatively uncommon bridge type, the North Skunk River Bridge is an important highway-related resource [adapted from Fraser 1992].
- Pinned Parker through truss bridge over North Skunk River on CR G13/110th Street
- Mahaska County, Iowa
- Open to traffic
- Built 1920
- - American Bridge Co. of New York (Fabricator)
- Iowa Bridge Co. of Des Moines, Iowa
- Iowa State Highway Commission of Ames, Iowa (Designer)
- Pinned Parker through truss
Length of largest span: 200.1 ft.
Total length: 202.1 ft.
Deck width: 17.1 ft.
Vertical clearance above deck: 10.0 ft.
Posted to the National Register of Historic Places on May 15, 1998
- Approximate latitude, longitude
- +41.49432, -92.63433 (decimal degrees)
41°29'40" N, 92°38'04" W (degrees°minutes'seconds")
- Approximate UTM coordinates
- 15/530522/4593697 (zone/easting/northing)
- Quadrangle map:
- New Sharon
- Land survey
- T. 77 N., R. 15 W., Sec. 7
- Average daily traffic (as of 2014)
- Inventory numbers
- IA 238030 (Iowa bridge number)
NRHP 98000503 (National Register of Historic Places reference number)
BH 13986 (Bridgehunter.com ID)
- Inspection report (as of December 2017)
- Overall condition: Poor
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Deck condition rating: Poor (4 out of 9)
Sufficiency rating: 20.2 (out of 100)
View more at BridgeReports.com
- December 4, 2016: Updated by Dylan VanAntwerp: Removed category "Skunk River"
- August 9, 2012: Updated by Luke Harden: Added other builder
- September 8, 2011: Updated by Luke Harden: Added builder
- August 11, 2011: Updated by Luke Harden: Corrected build date, bridge type, added descrition and photographs