John S. Allen Dam is an earth dam located in Forsyth County, North Carolina, built in 2006. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 166 ft long, taller than 62% of U.S. dams with a recorded height. 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 John S. Allen Dam
The primary purpose of John S. Allen Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John S Allen (private). It impounds the Ut to Yadkin River.
The dam stands 28 feet tall and stretches 166 feet across, creates a reservoir covering 2 acres, and has a maximum storage capacity of 26 acre-feet. Completed in 2006, the structure is relatively new.
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 01/16/2025.
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Location
| State | North Carolina |
| County | Forsyth |
| River/Stream | Ut to Yadkin River |
| Coordinates | 36.23860, -80.43720 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Length | 166 ft |
| Year Completed | 2006 (20 years old) |
Storage & Hydraulics
| NID Storage | 26 acre-ft |
| Max Storage | 26 acre-ft |
| Surface Area | 2 acres |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John S Allen |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 01/16/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | NC05729 |
| Federal ID | NC05729 |
| More Info | State Dam Safety Program |