| Steen River impact structure | |
| Map: | Canada |
| Confidence: | Confirmed |
| Diameter: | 25km (16miles) |
| Age: | 91 ± 7 Ma Late Cretaceous |
| Exposed: | No |
| Drilled: | Yes |
| Country: | Canada |
| Province: | Alberta |
| District: | Mackenzie County |
Steen River is an impact structure in Alberta, Canada. It is 25km (16miles) in diameter and the age is estimated to be 91 ± 7 million years (Late Cretaceous). The structure is not exposed at the surface. The original crater was partially eroded prior to burial, and lies under 200m (700feet) of sediments.[1]