East Fork Above Lavon Ws Scs Site 1b Dam is an earth dam located in Collin County, Texas, built in 1957. It carries a High hazard potential classification.
Dam profile
NID height · 40 ft40 ft tall and 1,645 ft long, taller than 86% 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 East Fork Above Lavon Ws Scs Site 1b Dam
The primary purpose of East Fork Above Lavon Ws Scs Site 1b 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 Collin County;collin County Swcd (local government). It impounds the Rutherford Branch near Mckinney.
The dam stands 40 feet tall and stretches 1,645 feet across, creates a reservoir covering 23 acres, has a maximum storage capacity of 990 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1957, 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. Notably, no emergency action plan is currently on file for this high-hazard dam. The most recent inspection on record was 03/18/2024.
At 40 feet, this dam is taller than 86% 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 | Collin |
| Nearest City | Mckinney |
| River/Stream | Rutherford Branch |
| Coordinates | 33.22250, -96.74895 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 1,645 ft |
| Year Completed | 1957 (69 years old) |
Storage & Hydraulics
| NID Storage | 990 acre-ft |
| Max Storage | 990 acre-ft |
| Normal Storage | 157 acre-ft |
| Surface Area | 23 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 2 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Collin County;collin County Swcd |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Not assessed |
| Last Inspection | 03/18/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | TX01119 |
| Federal ID | TX01119 |
| More Info | State Dam Safety Program |