Agreserves Plymouth Wastewater Storage Pond is a dam located in Benton County, Washington, built in 2023. It carries a Significant hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 1,600 ft long. 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 Agreserves Plymouth Wastewater Storage Pond
Agreserves Plymouth Wastewater Storage Pond is a dam in Benton, Washington. The dam is owned by Agreserves Inc (private). It impounds the Columbia near Plymoth.
The dam stands 19 feet tall and stretches 1,600 feet across, has a maximum storage capacity of 32 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 2023, the structure is relatively new.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam.
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Location
| State | Washington |
| County | Benton |
| Nearest City | Plymoth |
| River/Stream | Columbia |
| Coordinates | 45.94252, -119.36813 |
Physical Characteristics
| NID Height | 19 ft |
| Dam Length | 1,600 ft |
| Year Completed | 2023 (3 years old) |
Storage & Hydraulics
| NID Storage | 32 acre-ft |
| Max Storage | 32 acre-ft |
| Normal Storage | 23 acre-ft |
| Drainage Area | 3 sq mi |
Ownership & Safety
| Purpose | Other |
| Owner | Agreserves Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | WA02080 |
| Federal ID | WA02080 |
| More Info | State Dam Safety Program |