10 votes

Fort Morgan Rainbow Arch Bridge



Photo submitted by Marne Jurgemeyer

BH Photo #101604

Street View 


Supposedly the longest Marsh arch when completed in 1923.

From the Fort Morgan Area Chamber of Commerce site: http://www.fortmorganchamber.org/tourism.htm

"Built in 1922 1923, this landmark was placed on the National Register of Historic Places in 1984. Additionally, in 1992 it was designated a Colorado Civil Engineering Landmark. This bridge has survived major floods and in 1935 braced a 10 foot wall of water virtually undamaged. Today it is used for foot traffic and offers a beautiful view of the South Platte River."


Eleven-span Marsh arch bridge over South Platte River on CO 52, just north of Fort Morgan
Morgan County, Colorado
Open to pedestrians only
Built 1922-23; made obsolete by new bridge in 1963; rehabilitated in 1987
- Charles G. Sheely of Denver, Colorado
- Colorado Bridge & Construction Co. of Denver, Colorado (Contractor)
- Marsh Engineering Co. of Des Moines, Iowa (Designer)
Concrete pony (Marsh) arch
Length of largest span: 90.0 ft.
Total length: 1,110.0 ft.
Deck width: 19.0 ft.
Posted to the National Register of Historic Places on February 4, 1985
Also called
James Marsh Rainbow Arch Bridge
Approximate latitude, longitude
+40.26906, -103.80122   (decimal degrees)
40°16'09" N, 103°48'04" W   (degrees°minutes'seconds")
Approximate UTM coordinates
13/601925/4458309 (zone/easting/northing)
Quadrangle map:
Fort Morgan
Inventory numbers
NRHP 85000221 (National Register of Historic Places reference number)
BH 11971 (Bridgehunter.com ID)

Update Log 

  • May 6, 2021: New photo from Geoff Hubbs
  • January 20, 2015: New photo from Roger Deschner
  • August 24, 2012: New photos from Martha Carver
  • June 19, 2011: Updated by Clark Vance: Added Chamber of Commerce information, changed design to Marsh arch
  • April 25, 2010: New Street View added by J.P.
  • June 1, 2006: Posted photos from Marne Jurgemeyer


  • Marne Jurgemeyer
  • J.P. - wildcatjon2000 [at] gmail [dot] com
  • Clark Vance - cvance [at] dogmail [dot] com
  • Martha Carver - martha_carver [at] bellsouth [dot] net
  • Roger Deschner - rogerdeschner [at] gmail [dot] com
  • Historical Article
  • Geoff Hubbs


Fort Morgan Rainbow Arch Bridge
Posted January 20, 2018, by Daniel (dmarkofsky [at] gmail [dot] com)

Visited January 20, 2018. Very cool bridge. A video in the nearby history museum of the 1965 flood shows the bridge withstanding the water. Amazing!

Fort Morgan Rainbow Arch Bridge
Posted May 14, 2015, by Nathan Holth (webmaster [at] historicbridges [dot] org)

Some nice historical photos in this article


Fort Morgan Rainbow Arch Bridge
Posted June 19, 2011, by Tony Dillon (spansaver [at] hotmail [dot] com)

One word........."WOW"