Alder
High HazardSatisfactory ConditionEmergency Action Plan: Yes
Location
| State | Washington |
| County | Pierce |
| Nearest City | Yelm, WA |
| River/Stream | Nisqually River |
| Coordinates | 46.80104, -122.31016 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 330 ft |
| Dam Height | 285 ft |
| Dam Length | 1,487 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 241,195 acre-ft |
| Max Storage | 241,195 acre-ft |
| Normal Storage | 214,500 acre-ft |
| Surface Area | 3,065 acres |
| Drainage Area | 286 sq mi |
| Max Discharge | 80,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Tacoma |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 01/23/2023 |
| Emergency Action Plan | Yes |