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Table 3a. Ouray Reach Cross Sections - Scour and Fill Cycle Cross Section Net Change in Numberl Bed Elevation Comments OCW 1 No net change. 9 ft fill on left side. 2.5 ft of scour on right side. 3 ft of right overbank deposit. OCW 2a2 Net fill. 12 ft fill on right bank, 50 ft wide sand bar deposit. OCW 2b2 Net scour. 2 ft lower thalweg, 1.5 ft of overbank deposits. OCW3 No net change. I - 2 ft of scour in main portion of channel. OCW 43 Net fill. Main channel filled during peak flows. 2 ft of deposit on 420 ft ofleft channel. Right channel did not change. OCW5 Net scour. Narrow cross section. Thalweg is 5 ft lower. OCW6 Net fill. Sand bar deposit in main channel. Slight left overbank deposits. OCW7 No net change. Uniform cross section. Deep thalweg scour during peak flow (6 ft). Refilled 9 ft on the falling limb of the hydro graph. SHE 8 No net change. Some bar deposition in main part of channel during peak flow. SHE 9 Net scour. Thalweg is 4 ft deeper. Slightly deeper scour during peak flow. SHE 9.5 No net change. Thalweg deepened 2 ft during runoff as well as middle third of channel. Left third of channel filled an average of 4 ft. SHE 10 Net fill. 170 ft of sand bar deposition (8 ft high) from right bank. 2.5 ft of channel scour in channel. Thalweg was 6.5 ft lower during peak flows. SHE 10.5 No net change. 4 ft of fill in center of channel. Thalweg development along left bank (4 ft deeper). Cross section fill during peak flow. .. WYB 11 Net fill. 3 ft high bar development along left .bank, 120 ft extension into channel. Minor deposition in center of channel. WYB 11.5 No net change. 3 ft of scour on left two-thirds of channel. 5 - 7 ft of deposit on right one- third of channel. Channel fill during peak. WYB 12 No net change. 2 - 3 ft of deposit along left bank. 2 ft of scour in main part of channel. WYB 13 Net scour. Thalweg development along right bank. 5 ftof scour. WYB 14 No net change. There were two areas of deposit and two areas of scour with 1 - 3 ft of bed elevation change. WYB 15 No net change. The thalweg along the left bank was filled which was balanced by 1 to 2 ft of scour in the rest of the channel. LEB 16 No net change. The thalweg flip-flopped. The thalweg near the left bank filled with 8 ft of sand deposit while a new thalweg developed on the right one-third of the channel to the same depth. Center bar was also scoured out. LEB 17 No net change. Fairly uniform channel which become more uniform in shape. Some fill during the peak flow. 23 e e e