The Perrine Bridge, constructed in 1976, is a 1,500-foot-long steel deck arch that carries four lanes of US 93 over the Snake River in Twin Falls, Idaho. Working with Idaho Transportation Department (ITD) Staff, B&N developed a comprehensive, long-range Asset Management Plan (AMP) for the structure. The AMP provides ITD with a bridge-specific plan to extend the service life, avoid future load restrictions, maintain safety, and minimize maintenance costs. B&N also prepared plans for the rehabilitation of the bridge, including the replacement of corroded bolts in the arch end posts, installation of protective coatings in corrosion-prone areas, adding drip bars, repairs to the inspection access system, repairs to the concrete substructures, repairs to the pedestrian railings, repairs to utility conduits and repairs to the sidewalk joints. The rehabilitation project will be completed with minimal disruption of traffic on this highly traveled river crossing. B&N is providing technical support during construction and on-site inspection services to oversee the completion of critical repairs.