| Willow Creek | |
| Map Size: | 300 |
| Pushpin Map: | USA Idaho |
| Pushpin Map Size: | 300 |
| Pushpin Map Caption: | Location of the mouth of Willow Creek in Idaho |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Idaho |
| Subdivision Type4: | Counties |
| Subdivision Name4: | Bonneville County, Idaho, Bingham County, Idaho |
| Length: | 84miles[1] |
| Source1 Location: | east of the Blackfoot Mountains, Bingham County, Idaho |
| Source1 Coordinates: | 43.0944°N -111.7144°W[2] |
| Source1 Elevation: | 6568feet[3] |
| Mouth: | Snake River |
| Mouth Location: | north of Idaho Falls, Bonneville County, Idaho |
| Mouth Coordinates: | 43.5528°N -111.9881°W |
| Mouth Elevation: | 4777feet |
Willow Creek is a 840NaN0 long[1] tributary of the Snake River in the U.S. state of Idaho. Beginning at an elevation of 6568feet[3] east of the Blackfoot Mountains in southeastern Bingham County, it flows generally north into Bonneville County and past Bone. South of the town of Ririe, the creek is impounded by Ririe Dam, forming Ririe Reservoir. It then turns southwest, passing between Iona and Ucon, before bifurcating into two distributaries, North Fork Willow Creek and South Fork Willow Creek,[4] at an elevation of 4777feet.[2] Both forks reach the Snake River north of Idaho Falls.[4]
Willow Creek has significant populations of brown trout.[5]