Guntersville Dam and powerhouse. Closeup view of powerhouse. Note texture of concrete on electrical bay which is typical of most TVA (Tennessee Valley Authority) projects. Pattern is produced by alternating directions of grain in adjoining form panels. Rough-sawn lumber is used to make grain more pronounced. Heavy texture conceals color and surface irregularities of concrete and will become particularly valuable as concrete ages. Office floor is above flood level and has continuous glass brick strip