Neffs is an earth dam located in Wayne County, Utah, built in 1900. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 135 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 Neffs
The primary purpose of Neffs is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Mark Newman (private). It impounds the Cedar Creek near Lyman.
The dam stands 12 feet tall and stretches 135 feet across, has a maximum storage capacity of 80 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1900, the structure is over a century 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. The most recent inspection on record was 09/07/2021.
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Location
| State | Utah |
| County | Wayne |
| Nearest City | Lyman |
| River/Stream | Cedar Creek |
| Coordinates | 38.44908, -111.49421 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Length | 135 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Normal Storage | 50 acre-ft |
| Drainage Area | 2 sq mi |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Mark Newman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/07/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | UT00224 |
| Federal ID | UT00224 |
| More Info | State Dam Safety Program |