| Dam Name | Ryan |
| Incident Date | 6/15/2013 |
| Country | United States |
| State/Province | Montana |
| Dam Height (m) | 18.6 |
| Uncontrolled Release of the Reservoir | No |
| Dam Type | Gravity |
| Detailed Dam Type | |
| Incident Type | Gate Failure |
| Incident Description | Gate failed to completely close from open position Waste Gate No. 4 failed to close after it had been fully opened to 6 feet. Operators to only close gate to half-way (3 feet). |
| High Level Failure Mode | |
| Lessons Learned | |
| Initiating Event | Equipment Failure |
| Initiating Event Description | |
| Structures/Components | Gate |
| Failure Mode Description | |
| Emergency Action Plan Implemented | Unknown |
| Consequences | Consequence Data Unavailable |
| Geographic Coordinates - Decimal Degrees | 47.5691, -111.1248 |
| Normal Reservoir Storage (m3): | 4,505,909.2 |
| Crest Elevation (m) |