Dam 21

Dam 21 was raised in 2011 to pass the 100% Probable Maximum Flood (PMF).

Dam Dimensions

Type of Dimension Measurement
Location 8.1 miles east of Round Rock
Height 49 feet
Length 743 feet
Normal Pool Elevation
619.19 feet above mean sea level
Auxiliary Spillway Elevation
630.68 feet above mean sea level
Top of Dam Elevation
640.24 feet above mean sea level (effective)
Normal Storage Capacity
85 acre-feet

Dam 21 Construction Projects

Project Status Contract Start Date
Completion Date
Dam 21
Complete $171,353 September 2010
February 2011
Capital Concrete Contractors