His design features two arched ribs, one on either side of the roadway, rising above the deck.

Drivers see the rainbow arch crowns on each side, similar to crossing a pony truss bridge.

The bridge over the Little Cottonwood River is one of the oldest Marsh rainbow arches in the country.

Unfortunately, as traffic flow increased and farm machinery got larger, many of Marsh's rainbow arch designs became obsolete, since they could not be widened.

There are only half a dozen Marsh rainbow arch bridges remaining in Minnesota.