| Name | Location | Status | Design | Year Built | Year Lost | Span Length | Total Length |
|---|---|---|---|---|---|---|---|
| Boulder County Road 71 Bridge | CR 71 over North St. Vrain Creek | Open to traffic | Arch | 1991 | -- | 66.9 ft. | 76.1 ft. |
| CO 119 Tunnel | CO 119 under Rock formation | Open to traffic | Tunnel | 1953 | -- | -- | 350.0 ft. |