For the Rainbow Arch Bridge, Marsh used a design that he had patented in 1912. Marsh's invention was an ingenious blend of steel and concrete technologies, which combined the concrete arch form with a sophisticated steel reinforcing system. The reinforcing was so heavy and complex, in fact, that his bridges have been called steel structures with concrete veneers. Marsh built several small-scale and medium-scale rainbow arches throughout the Midwest in the 1910s. This bridge at Fort Morgan represented the first large-scale application of his distinctive design.
The bridge at Fort Morgan has been listed on the National Register of Historic Places. It is the only rainbow arch built in Colorado, and at its completion it was the longest rainbow arch in the world. It is today a nationally significant example of the important, but relatively uncommon, structural type. As it arches gracefully over the broad Platte River, the Rainbow Arch Bridge symbolizes the permanence of early highway construction in the state.
| HM Number | HMVRL |
|---|---|
| Tags | |
| Marker Condition | No reports yet |
| Date Added | Sunday, October 12th, 2014 at 11:27pm PDT -07:00 |
| UTM (WGS84 Datum) | 13T E 601924 N 4458125 |
|---|---|
| Decimal Degrees | 40.26740000, -103.80126667 |
| Degrees and Decimal Minutes | N 40° 16.044', W 103° 48.076' |
| Degrees, Minutes and Seconds | 40° 16' 2.64" N, 103° 48' 4.56" W |
| Driving Directions | Google Maps |
| Area Code(s) | 970, 303 |
| Closest Postal Address | At or near 11 Curry St, Fort Morgan CO 80701, US |
| Alternative Maps | Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap |
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