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In October 1909 Charles G. Sheely was awarded the contract for this bridge over the Green River and another over the Little Sandy about fifty miles north of Rock Springs. Called the Big Island Bridge for the region it opened, this two-span Pratt through features the longest simple spans for its type in the state; it is also one of the oldest existing trusses in the state and one of the most significant of the early county-built vehicular bridges.