Masonry Dam
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Washington |
| County | King |
| Nearest City | Cedar Falls |
| River/Stream | Cedar River |
| Coordinates | 47.41221, -121.75258 |
Physical Characteristics
| Dam Type | Arch |
| NID Height | 230 ft |
| Dam Length | 980 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 175,000 acre-ft |
| Max Storage | 175,000 acre-ft |
| Normal Storage | 90,660 acre-ft |
| Surface Area | 280 acres |
| Drainage Area | 81 sq mi |
| Max Discharge | 74,400 cfs |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Seattle City Light |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/01/2020 |
| Emergency Action Plan | Yes |