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American River Road No. 222-MP 0.03

Elk City, Idaho

Bridge Replacement


USDA Forest Service - Region 1


Great West Engineering


Cook & Sons


August 22, 2014

Known as the first mining town in Idaho County, the town was dubbed Elk City when miners saw a herd of at least 700 elk while camping on the hill east of the present town. Established in September 1861, Elk City soon boasted 2,000 people, a handful of general stores, five saloons and two hotels. However, by the fall of 1862, Elk City's boom was already fading and reports of new gold strikes in Montana lured residents away from the town. Elk City is currently located in the 2,224,091-acre Nez Perce National Forest as part of the Gold Rush Loop Tour.

The original culverts on Road 222 at Mile Post 0.03 were aquatic organism barriers and caused some minor erosion downstream of the American River. For these reasons, it was decided that the two existing culverts should be removed and replaced with a 46'-9" x 16' BridgeCor® Single Radius Arch, 76' in length, with projecting square ends and set on precast footings. This custom-sized BridgeCor structure was designed to fit the site according to specifications from the engineer, and was keyed into rock with an optimal cover height optimizing the BridgeCor gage requirement.

The project improvements included, but were not limited to: structure excavation, excavation and reshaping of the channel, bedrock excavation, installation of precast footings, installation of the BridgeCor structure, structural backfill, placement of riprap, embankment and excavation of the roadway approaches, installation of guardrail and road paving.

The BridgeCor plate structure was selected for its economical cost as well as its ability to fit the site at the remote location. The precast footings were set in one day while the BridgeCor was delivered to the site in pieces and assembled and ready for backfill in just three days.

"The customized BridgeCor structure worked well for the site," concluded Daniel Karlin, P.E., Project Engineer with Great West Engineering, Inc.

Technical Description:

• Product: BridgeCor® Single Radius Arch
• Span: 46-ft. 9-in.
• Rise: 16-ft.
• Length: 76 ft.

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