The Williams Fork Dam project consists of a thin arch dam constructed on top of an existing gravity-arch dam with appurtenant structures and power house. Foundation rocks consisted of granitic gneiss cut by lenses of mica schist and dikes.

This case history reports on: (1) foundation excavation and characteristics of the granitic gneiss; (2) the consolidation grouting pattern and a detailed account of the record; (3) the cut-off, grout curtain; (4) dental-treatment formula used for detailed foundation treatment of the weathered zones; and (5) foundation geology of the West Dike consisting of young, poorly cemented clays and silts. The project demonstrates the interdependence of structural features in bedrock and the depth and degree of unsound weathered material, excavation and slope stability characteristics, and the grout consumption for consolidation.