Mcmahan Lake Dam is an earth dam located in Sebastian County, Arkansas, built in 1948. It carries a Significant hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 811 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 Mcmahan Lake Dam
The primary purpose of Mcmahan Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Rick Short (private). It impounds the Little Grasse Creek-tr near Barling.
The dam stands 11 feet tall and stretches 811 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 43 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1948, the structure is well-established, with more than 75 years of service.
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.
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Location
| State | Arkansas |
| County | Sebastian |
| Nearest City | Barling |
| River/Stream | Little Grasse Creek-tr |
| Coordinates | 35.32833, -94.29861 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 811.1 ft |
| Year Completed | 1948 (78 years old) |
Storage & Hydraulics
| NID Storage | 43 acre-ft |
| Max Storage | 43 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 641 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | Rick Short |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AR01207 |
| Federal ID | AR01207 |
| More Info | State Dam Safety Program |