Blacks Fork
| Blacks Fork Blacks Fork of the Green River | |
|---|---|
| Location | |
| Country | United States | 
| State | Utah, Wyoming | 
| Counties | Summit, Uinta, Lincoln, Sweetwater | 
| Cites | Millburne, Fort Bridger, Granger | 
| Physical characteristics | |
| Source | |
| • location | Uinta Mountains (Utah) | 
| • coordinates | 40°56′25″N 110°35′19″W / 40.94028°N 110.58861°W | 
| Mouth | Flaming Gorge Reservoir | 
|  • location | Wyoming | 
|  • coordinates | 41°17′42″N 109°32′06″W / 41.29500°N 109.53500°W | 
| Discharge | |
| • location | USGS gage #09224700 near Little America | 
| • average | 292 cu ft/s (8.3 m3/s) | 
| • minimum | 0 cu ft/s (0 m3/s) | 
| • maximum | 9,980 cu ft/s (283 m3/s) | 
| Basin features | |
| Tributaries | |
| • left | Little West Fork Blacks Fork, Hams Fork | 
| • right | Smiths Fork | 
Blacks Fork (also referred to as Blacks Fork of the Green River) is a 175-mile-long (282 km) tributary of the Green River in Utah and Wyoming in the United States.