Longview Sewage Lagoon No 1 is an earth dam located in Cowlitz County, Washington, built in 1986. It carries a Low hazard potential classification.
Dam profile
NID height · 9 ft9 ft tall and 3,250 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 Longview Sewage Lagoon No 1
Longview Sewage Lagoon No 1 is a dam in Cowlitz, Washington. The dam is owned by Longview City (local government). It impounds the Tr-coal Creek Slough-offstream near Longview.
The dam stands 9 feet tall and stretches 3,250 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 207 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1986, the structure is 40 years old.
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.
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Location
| State | Washington |
| County | Cowlitz |
| Nearest City | Longview |
| River/Stream | Tr-coal Creek Slough-offstream |
| Coordinates | 46.17597, -123.02031 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 9 ft |
| Dam Length | 3,250 ft |
| Year Completed | 1986 (40 years old) |
Storage & Hydraulics
| NID Storage | 207 acre-ft |
| Max Storage | 207 acre-ft |
| Normal Storage | 87 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 8 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Longview City |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WA00507 |
| Federal ID | WA00507 |
| More Info | State Dam Safety Program |