22' - Major Flood Stage: Large sections of Duncan flood including business district, residences, and Highway 75.
21' - Moderate Flood Stage: Water running over top of left bank of Highway 75 bridge approach in Duncan. Fields adjacent to the river and structures close to the river flood.
20' - Minor Flood Stage: Highway 75 bridge approach bottom reached on left bank. Dike structure failure is a possibility.
18' - Bankfull Stage: Water near the top of the dike structure and may start causing erosion downstream of bridge.
16' - Action Stage: Water could begin to damage the dike structure that protects Duncan.