Swofford Pond is an earth dam located in Lewis County, Washington. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 650 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Swofford Pond
The primary purpose of Swofford Pond is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by City of Tacoma (public utility). It impounds the Sulfer Creek ( Cowlitz River).
The dam stands 26 feet tall and stretches 650 feet across, creates a reservoir covering 209 acres, and has a maximum storage capacity of 1,740 acre-feet.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/13/2024.
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Location
| State | Washington |
| County | Lewis |
| Nearest City | None |
| River/Stream | Sulfer Creek ( Cowlitz River) |
| Coordinates | 46.50294, -122.39293 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 20 ft |
| Dam Length | 650 ft |
Storage & Hydraulics
| NID Storage | 1,740 acre-ft |
| Max Storage | 1,740 acre-ft |
| Normal Storage | 1,500 acre-ft |
| Surface Area | 209 acres |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Tacoma |
| Owner Type | Public Utility |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/13/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA00136 |
| Federal ID | WA00136 |
| More Info | State Dam Safety Program |