Historic Bridges
of the United States
Boulder County
Colorado
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Adams County, CO
Gilpin County, CO
Grand County, CO
Jefferson County, CO
Larimer County, CO
Weld County, CO
Boulder County Road 71 Bridge
Through arch bridge over North St. Vrain Creek on CR 71
Open to traffic
Built 1991
CO 119 Tunnel
Tunnel on CO 119, between Nederland and Boulder
Open to traffic
Built 1953