Colorado
| Name | Colorado |
| Type | Steamer |
| GRT | 7,165 tons |
| Country |  British |
| Built | 1914 |
| Builder | Russell & Co., Port Glasgow |
| Operator | Ellerman’s Wilson Line, Ltd., Hull |
| History |
U-boat attacks on Steamer Colorado
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 20 Oct 1917 | UB 31 (Thomas Bieber) | Sunk | Torpedoed 1.5 miles E of Start Point | Hull - Alexandria | coal & coke | 4 |
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