This project addresses severe rot caused by faulty flashing details at five locations on the bridge. The work will focus on replacing rotted structural components, improving flashing, and ensuring long-term protection to prevent further damage. Work to be Performed: 1. Structural Repairs: o Burr Arches: Remove and replace the rotted end sections of the exterior Burr arches at all four corners of the bridge. Jack up both ends of the bridge to relieve pressure on the rotted bearing blocks and bolster beams. o Bolster Beams: Remove and replace the two rotted bolster beams. Extend the replacement beams to cover a full 24-foot length. o Bearing Blocks: Remove and replace all rotted bearing blocks under the bridge. o West Portal Joist: Pull up the decking and replace the rotted first joist at the west portal with a new white oak timber. 2. Flashing and Sheathing: o Flashing: Remove and replace the faulty flashing at all four corners to protect structural components. o Sheathing: Replace the sheathing at the corners to fully cover and protect the bolster beams. Ensure new sheathing extends 24 feet to fully cover bolster beams and prevent water infiltration. 3. Protective Measures: o Wood Treatment: Utilize protective measures to protect the wood elements from moisture and the elements. Use No. 1 and better white oak for all timber replacements (arches, bolster beams, bearing blocks, and joists).
