Mountain Lake Dam
High HazardFair ConditionEmergency Action Plan: Yes
Location
| State | Washington |
| County | San Juan |
| Nearest City | Olga |
| River/Stream | Cascade Creek |
| Coordinates | 48.64991, -122.81250 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 17 ft |
| Dam Length | 172 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 3,010 acre-ft |
| Max Storage | 3,010 acre-ft |
| Normal Storage | 2,870 acre-ft |
| Surface Area | 180 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 200 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | WA PARKS |
| Owner Type | State |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 07/23/2024 |
| Emergency Action Plan | Yes |