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Supple Ford Bridge



Photo by John N. Vogel, photographer, September 1990, for HAER

View photos at Library of Congress

BH Photo #123455


Lost Bowstring through truss bridge over South Fork Maquoketa River on Temple Hill Road in Clay Township
Clay Township, Jones County, Iowa
Replaced by new bridge
Built 1875; Washed away 1947 but hauled back and reset; Replaced 1991
- King Bridge Co. of Cleveland, Ohio
Bowstring Truss

"The Jones County bowstring arch-truss bridge is a virtually intact example of a once-common technology in bridge design in Iowa, the bowstring bridge designed by the King Bridge Company of Cleveland, Ohio. In 1980, this bridge was described as one of only approximately 28 remaining bowstring bridges in Iowa and one of four remaining bowstring bridges in Jones County. It was erected in 1875 and is the second oldest surviving iron truss bridge in Jones County and the oldest remaining bridge built by the King Iron Bridge Company in the county today."

Historians: Norene Roberts, PhD., Historical Research, Inc., Minneapolis, Minnesota
John N. Vogel, PhD.,Consulting Historian, Milwaukee, Wisconsin

September 26, 1990

Span length: 100.4 ft.
Total length: 100.4 ft.
Deck width: 15.4 ft.
Approximate latitude, longitude
+42.18611, -90.98333   (decimal degrees)
42°11'10" N, 90°58'60" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/666531/4672408 (zone/easting/northing)
Quadrangle map:
Inventory number
BH 37393 (Bridgehunter.com ID)

Update Log 

  • September 24, 2014: Updated by Tony Dillon: Changed from pony to through truss
  • September 9, 2008: Added by J.R. Manning


  • J.R. Manning - thekitchenguy [at] sbcglobal [dot] net
  • HAER IA-32 - Supple Ford Bridge
  • Tony Dillon - spansaver [at] hotmail [dot] com