Specifications include, but are not limited to: Design, fabrication, and delivery of two (2) prefabricated steel bridges with guardrails, abutments, and foundations are needed for stream crossings in support of IDFG Habitat Program and the United States Forest Service. BRIDGE DESIGN REQUIREMENTS Structural steel shall conform to ASTM Specification A 709, Grade 50W (ASTM A 588 Weathering Steel). This project requires that all iron and steel used in an infrastructure project are produced in the United States–this means all manufacturing processes, from the initial melting stage through the application of coatings, occurred in the United States, as well as the other criteria listed in Build American, Buy American (BABA) Act, Pub. L. No. 117-58, §§ 70901-52 and OMB M-22-11. Bridge span, defined as the nominal inside clear distance between inside edges of footers. Salmon River Road = 40 feet inside open span, 44 feet out-to-out along the road centerline; and 16-degree skew. Forest Road NF – 039 = 34 feet inside open span, 38 feet out-to-out along the road centerline, and 34-degree skew. Bridge width, defined as width between structure edges measured perpendicular to the roadway centerline. Salmon River Road = 24’ minimum. Forest Road NF – 039 = 15’ minimum. Minimum footer elevation (north), defined as the elevation of the subgrade below the bridge footing. Salmon River Road = To be determined from the Geotechnical recommendations and bridge abutment and foundation designer. (Attachment #4 – Allied Engineering Geotech) Forest Road NF – 039 = To be determined from the Geotechnical recommendations and bridge abutment and foundation designer. (Attachment #4 – Allied Engineering Geotech) Minimum bottom chord elevation (north), defined as the elevation of the lowest significant structural element on the superstructure. Proposed structure must meet this elevation or be higher. Salmon River Road = Relative elevation 3466.70 Forest Road NF – 039 = Relative elevation 3479.30 Top of deck (north), defined as the elevation of the top of the steel deck. Salmon River Road = Relative elevation 3470.70 Forest Road NF – 039 = Relative elevation 3483.3
