Rainbow Bridge Informational Website
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The Rainbow Bridge is in the Lake Natoma State Recreation area and adjacent to the Historic Folsom Power House. The bridge crosses the upper end of Lake Natoma on the American River on Greenback Lane. Greenback Lane is a major east-west arterial ending on the south side of the river. The bridge provides a major connection for businesses and residents on both sides of the river.



The existing bridge consists of a 208' long main concrete arch span with open spandrel columns and 7 span north and 4 span south T-girder approaches totaling 511' in length. The bridge was built in 1917 and underwent a major reconstruction in 1969. Up until 1999, when the new Lake Natomas Crossing was completed, it was the only means of crossing the American River in the City of Folsom.



The 1969 reconstruction included widening the structure from 23'-4" to 31' which also included a 4' wide sidewalk on one side. The low sufficiency rating of 55.0 is due to the narrow deck combined with a high Average Daily Traffic (ADT) of 36,700. The narrow shoulders and high ADT on the bridge are a safety issue. Caltrans appraisal of the deck width is "Intolerable - Replace".



The bridge is also a Category 2 Historic Structure - eligible for listing in the National Register of Historic Places. In addition, the old Folsom historical steel truss bridge was recently re-erected in its original location just upstream of the Rainbow Bridge for pedestrian and cyclist use.

The sidewalk is currently closed to pedestrian traffic