Figure 7. Topographic cross-sections of the 30 mile sand bar in upper Marble Canyon. Flow stage elevations for thehigh- elevation volume calculations (556 m3 /s, 20,000 ft3 /s), the 1996 controlled flood (1,274 m3 /s, 45,000 ft3 /s),and 1997 test flow (878 m3 /s, 31,000 f3t /s) are shown.