The HCRH State Trail project included the construction of approximately 1.5 miles of a pedestrian trail that meanders along sections of the Historic Columbia River State Highway, passes Hole in the Wall Falls, and crosses Warren and Wonder Creeks. Designed to connect future phases of the trail system, the project accomplished the construction of an 80-foot prestressed arch girder bridge over Moffett Creek for pedestrian and cyclist use. This included drilling 36-inch shaft footings, placing arched concrete girders designed to replicate the old Moffett Creek Bridge, and placing over 160 feet of baluster style bridge rail.
Civil work on the project included 9 acres of medium density clearing and grubbing, 30,000 cubic yards of excavation, drainage, paving, concrete barrier placement, and landscaping. With an interfering rock face adjacent to I-84, our crews also performed scaling and perimeter controlled blasting, installed 4,500 feet of rock anchors, and placed wire mesh slope protection. Lastly, our crews constructed 11 different retaining walls throughout the project; the type of retaining walls included rockery walls, gabion basket walls, micropile walls, soil nail walls, cast-in-place cantilever walls, and mechanically stabilized earth (MSE) walls