Gerstacker Bridge

Abandoned international crossing, built in the early 1960s by Dow Chemical in conjunction with the (also now abandoned) fluorspar plant at river right (fluorspar, AKA 'fluorite', is the mineral form of calcium fluoride). The bridge was named for Carl Gerstacker, the CEO of Dow Chemical at the time. Fluorspar was mined in the mountains on the Mexican side, processed at the plant, and shipped via truck to the railroad in Marathon.