Four Mile Bridge, Copper Creek Road, Spans Table Rock Fork, Mollala River, Molalla, Clackamas County, OR

Significance: One of two remaining timber deck arch bridges in Oregon, Four Mile Bridge incorporates a unique combination of a truss and an arch to cross a short 118-foot span. Weyerhaeuser Company hauled over 1 billion board feet of timber over the bridge from 1943 to 1974, making a significant economic contribution to nearby communities. Built from old-growth timber, the bridge reflects local response to and involvement in national economic effects of World War II. Four Mile Bridge was determined eligible for inclusion in the National Register of Historic Places in 1986.
Unprocessed Field note material exists for this structure: FN-4
Survey number: HAER OR-13
Building/structure dates: 1943 Initial Construction
Building/structure dates: 1950 Subsequent Work
Building/structure dates: 1976
Building/structure dates: 1989 Demolished