Dartmouth Skiway Sewage Lagoon Dam is an earth dam located in Grafton County, New Hampshire, built in 1967. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 4 ft4 ft tall and 256 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 Dartmouth Skiway Sewage Lagoon Dam
Dartmouth Skiway Sewage Lagoon Dam is a dam in Grafton, New Hampshire. The dam is owned by Trustees of Dartmouth College (private). It impounds the Na near Lyme.
The dam stands 4 feet tall and stretches 256 feet across, creates a reservoir covering 0 acres, and has a maximum storage capacity of 2 acre-feet. Completed in 1967, the structure is well into its service life at over 50 years old.
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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/04/2021.
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Location
| State | New Hampshire |
| County | Grafton |
| Nearest City | Lyme |
| River/Stream | Na |
| Coordinates | 43.79080, -72.10030 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 4 ft |
| Dam Height | 4 ft |
| Dam Length | 256 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 2 acre-ft |
| Max Storage | 2 acre-ft |
| Normal Storage | 0 acre-ft |
| Surface Area | 0 acres |
| Max Discharge | 10 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Trustees of Dartmouth College |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/04/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH03762 |
| Federal ID | NH03762 |
| More Info | State Dam Safety Program |