Thompson's Island
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Marker Text: Dr. William Alexander Thompson (1803-1879) made an agreement with neighbors in 1850 to use the San Marcos River for irrigation and as a source of energy. He and his sons William A. and James used slave labor to build a gristmill, sawmill and cotton gin. The land, masses formed by digging a ditch for the waterwheel and a sluiceway from the river were called "Thompson Islands". The Thompsons directed the business until 1911 when John Matthew Cape (1861-1933) bough the mill. The use of electricity in 1942 ended the mill's need for water power. (1979)
Marker No: 10332
Aluminum 18 x 28 Subject Marker
Geographic: 29° 52' 17.62380000012", -91° 55' 40.57132000008"
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Location: Conway Drive and River Road, San Marcos