The presolicitation and preliminary letter/plans for MT FLAP BOR 2980(1), Sun River Bridge Replacement have been posted to SAM.gov: https://sam.gov/opp/78e0654a841e48d79a389f2e3a950009/view

Background and Project Description

The Sun River Bridge was originally built in 1916 by the U.S. Bureau of Reclamation as part of the Sun River Project. Its primary purpose at the time was to support and convey an 8-foot-diameter wood-stave siphon pipe across the Sun River. The original design intended for lightly loaded vehicles to travel across the upper truss chord of the single-lane structure, primarily to support Greenfields Irrigation District maintenance duties, although it has also been used by the public since it was constructed. In the 1940s, the wood-stave siphon was removed and replaced with a buried, cast-in-place concrete siphon that passes under the Sun River channel and remains in place today.

The Federal Highway Administration (FHWA) and cooperating agencies are proposing to replace the existing bridge with a new bridge meeting current design and safety standards. The existing Sun River Bridge is in poor condition, and its outdated design poses safety hazards and limitations to users.  A new bridge is needed to provide a crossing over the Sun River that safely and reliably accommodates all users.

Cooperating Agencies

• U.S. Bureau of Reclamation (USBR)
• U.S. Bureau of Land Management (USBLM)
• U.S. Forest Service (USFS)
• Greenfields Irrigation District (GID)