Snell Estates is an earth dam located in Carroll County, Maryland, built in 1979. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 14 ft14 ft tall and 1,400 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 Snell Estates
The primary purpose of Snell Estates is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Snell Estates Homeowners Assoc (private). It impounds the Offstream-middle Run near Mt Airy.
The dam stands 14 feet tall and stretches 1,400 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 83 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1979, the structure is 47 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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 12/17/2024.
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Location
| State | Maryland |
| County | Carroll |
| Nearest City | Mt Airy |
| River/Stream | Offstream-middle Run |
| Coordinates | 39.39278, -77.11640 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 1,400 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 83 acre-ft |
| Max Storage | 83 acre-ft |
| Normal Storage | 47 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 130 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Snell Estates Homeowners Assoc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 12/17/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MD00251 |
| Federal ID | MD00251 |
| More Info | State Dam Safety Program |