Sister Grove Creek Ws Scs Site 21 Dam
Sister Grove Creek Ws Scs Site 21 Dam is an earth dam located in Grayson County, Texas, built in 1960. It carries a High hazard potential classification and has a fair condition assessment.
About Sister Grove Creek Ws Scs Site 21 Dam
The primary purpose of Sister Grove Creek Ws Scs Site 21 Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Grayson County;upper Elm Red Swcd (local government). It impounds the Tr-sister Grove Creek.
The dam stands 37 feet tall and stretches 1,800 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 852 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1960, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 11/10/2020.
At 37 feet, this dam is taller than 84% of dams nationwide.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Texas dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Texas |
| County | Grayson |
| River/Stream | Tr-sister Grove Creek |
| Coordinates | 33.46849, -96.56539 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 1,800 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 852 acre-ft |
| Max Storage | 852 acre-ft |
| Normal Storage | 160 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,756 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | GRAYSON COUNTY;UPPER ELM RED SWCD |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Fair |
| Last Inspection | 11/10/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX02096 |
| Federal ID | TX02096 |
| More Info | State Dam Safety Program |