Norris Dam and powerhouse. Night view of Norris Dam with floodlighting. The more spectacular dams of the TVA (Tennessee Valley Authority) are equipped to be floodlit at night and are popular excursion points. Pinpoint lights along top of dam are small lenses in back of the handrail bracket road lighting fixtures. Wet spots on dam are the result of small shrinkage cracks during initial years which later sealed themselves by the sediment contained in the water