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Niobrara County
| Name | Location | Status | Design | Year Built | Year Lost | Span Length (ft.) | Total Length (ft.) |
|---|
| Cheyenne River Bridge | CN14-9 over Cheyenne River | Open to traffic | Pennsylvania through truss | -- | -- | 130.7 | 132.9 |
| Lance Creek Bridge | WY 271 over Lance Creek | Replaced by a new bridge | Timber stringer | 1940 | 2003 | 84.0 | 191.0 |
| Oil Creek Bridge | WY 271 over Oil Creek | Open to traffic | Timber stringer | 1940 | -- | 59.1 | 59.1 |
| Old Hwy 85 Old Woman Creek Bridge | Old Hwy 85 over Old Woman Creek | Open to traffic | Warren pony truss | 1924 | -- | 80.1 | 212.9 |
| Old US 85 Bridge | an abandoned alignment of US 85 over an unnamed creek | Seems to be used as part of a farm or ranch road | Timber stringer | -- | -- | -- | -- |
| Old US 85 Old Woman Creek Bridge | an abandoned alignment of US 85 over Old Woman Creek | Being in the desert, the bridge is in excellent shape | Concrete stringer | -- | -- | -- | -- |