Upper East Fk Laterals WS SCS Site 4b Dam, also known as Phelps Lake, is a vital flood risk reduction structure located in Rockwall, Texas.
Wind
Humidity
Built in 1955 by the USDA NRCS, this earth dam stands at a height of 40 feet and spans a length of 1594 feet. With a storage capacity of 646 acre-feet and a normal storage of 132 acre-feet, the dam serves multiple purposes including fire protection, stock, small fish pond, flood risk reduction, and recreation.
Situated along the TR-Squabble Creek, the dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its integrity. The spillway, with a width of 103 feet, is of the uncontrolled type, allowing for a maximum discharge of 3466 cubic feet per second. Despite a recent unsatisfactory condition assessment in April 2021, the risk potential is considered moderate (3) with no hazard potential available. The dam's emergency action plan (EAP) was last revised in 2010, highlighting the importance of continued monitoring and risk management measures for this critical infrastructure.
Years Modified |
2008 - Other |
Year Completed |
1955 |
Dam Length |
1594 |
Dam Height |
40 |
River Or Stream |
TR-SQUABBLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
45 |
Hydraulic Height |
40 |
Drainage Area |
1.17 |
Nid Storage |
646 |
Structural Height |
40 |
Outlet Gates |
Slide (sluice gate) - 1, Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Rock, Soil |
Nid Height |
40 |