Wirtz Dam

Wirtz Dam (formerly Granite Shoals Dam) was constructed from 1949 to 1951 to provide hydroelectric power and to form Lake Lyndon B. Johnson (formerly Lake Granite Shoals), one of the Texas Highland Lakes. Lake LBJ ‒ as it is more commonly referred to ‒ provides cooling water for the Lower Colorado River Authority's Thomas C. Ferguson Power Plant along Horseshoe Bay.

Wirtz Dam
Wirtz Dam
Official name	Wirtz Dam
Location	Horseshoe Bay, Burnet County, Texas, U.S.
Coordinates	30°33′20″N 98°20′16″W
Construction began	1949
Opening date	1951
Operator(s)	Lower Colorado River Authority
Dam and spillways
Impounds	Colorado River
Height	118.3 feet (36.1 m)
Length	5,491 feet (1,674 m)
Width (base)	80 feet (24 m)
Spillway type	10 controlled bulkhead-gate
Spillway capacity	317,400 cu ft/s (8,990 m3/s) (10 floodgates at 30,800; 2 turbines at 4,700)
Reservoir
Creates	Lake LBJ
Surface area	6,534 acres (26.44 km2)[1]
Power Station
Turbines	2[1]
Installed capacity	60 MW[1]

Wirtz Dam was originally named Granite Shoals Dam until 1951 when it was renamed in honor of Alvin J. Wirtz who had been instrumental in the formation of the LCRA.

Likewise, Lake LBJ was originally named Lake Granite Shoals until 1965 when it was renamed for another advocate of the LCRA, U.S. President Lyndon B. Johnson.

Wirtz Dam and Lake LBJ are located due west of Lake Marble Falls and the city of Marble Falls, Texas.[2]