| Willow Creek | |
| Map Size: | 250 |
| Pushpin Map: | USA Utah#USA |
| Pushpin Map Size: | 250 |
| Pushpin Map Caption: | Location of the mouth of Willow Creek in Utah |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Utah |
| Length: | 78miles[1] |
| Discharge1 Location: | below Hill Creek near Ouray |
| Discharge1 Min: | 0cuft/s |
| Discharge1 Avg: | 26.5cuft/s |
| Discharge1 Max: | 11000cuft/s |
| Source1: | Roan Cliffs |
| Source1 Location: | Grand County |
| Source1 Coordinates: | 39.3422°N -109.6642°W[2] |
| Source1 Elevation: | 6794feet |
| Mouth: | Green River |
| Mouth Location: | Uintah County |
| Mouth Coordinates: | 40.0269°N -109.7431°W |
| Mouth Elevation: | 4642feet |
| Basin Size: | 897sqmi[3] |
Willow Creek is a major north-flowing stream in Utah, United States, and is a tributary of the Green River. The creek drains a large remote area of the East Tavaputs Plateau, flowing into the Green River south of Ouray.
Willow Creek begins at the confluence of its East and West Forks about 25miles north of Thompson, Utah, in Grand County, to the north of the Roan Cliffs divide. East Willow Creek starts at an elevation of 8504feet at a spring along the Roan Cliffs; the shorter West Willow Creek originates at an elevation of 8359feet.[4] East Willow Creek is joined by She Canyon before combining with West Willow Creek to form the main stem. From there, Willow Creek flows northward into Uintah County, through the Uintah and Ouray Indian Reservation, across the East Tavaputs Plateau at the bottom of a rugged gorge. It receives several major tributaries from the east, including Meadow Creek, Main Canyon, and Sunday School Canyon. Below Sunday School Canyon, Willow Creek flows through a wider valley along the east side of Big Pack Mountain to its confluence with Hill Creek, its largest tributary. Above their confluence, Hill Creek is almost the same length as Willow Creek, flowing roughly parallel and several miles to the west of Willow Creek. Below this point Willow Creek turns northwest to join the Green River about 5miles south of Ouray and 3miles below the confluence of the White River.[5]
There are no dams on Willow Creek, but there is one dam on Hill Creek, forming Towave Reservoir. Willow Creek is used for agriculture, mainly livestock water supply. The creek has high levels of dissolved solids and is considered an impaired water body.[6]