Nantucket Dam is an earth dam located in Brazos County, Texas, built in 1977. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 900 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 Nantucket Dam
The primary purpose of Nantucket Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Nantucket Preservation Association (private). It impounds the Alum Creek near College Station.
The dam stands 20 feet tall and stretches 900 feet across, creates a reservoir covering 35 acres, has a maximum storage capacity of 428 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1977, the structure is 49 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 04/24/2024.
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Location
| State | Texas |
| County | Brazos |
| Nearest City | College Station |
| River/Stream | Alum Creek |
| Coordinates | 30.54365, -96.24337 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 900 ft |
| Year Completed | 1977 (49 years old) |
Storage & Hydraulics
| NID Storage | 428 acre-ft |
| Max Storage | 428 acre-ft |
| Normal Storage | 140 acre-ft |
| Surface Area | 35 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 1,727 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Nantucket Preservation Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 04/24/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX06372 |
| Federal ID | TX06372 |
| More Info | State Dam Safety Program |