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Grams and Schmidt 28 Figure Captions Figure 1. -- Map showing location of study area. Distance locations indicated on map are in kilometers upstream from the Colorado River confluence (Rkm). The locations of geomorphic subreaches, major tributaries, and U. S. Geological Survey stream gaging stations are also indicated. Figure 2. -- Annual maximum discharge of the Green River at Greendale and Jensen, Utah and the Yampa River at Deerlodge Park, Colorado. Greendale data are depicted with x's, Jensen data with +'s, and Deerlodge data with O's. Fitted lines are 5-yr moving averages. The records for Greendale 1920-1950, Jensen 1922-1946, and Deerlodge 1922-1981 are determined by gage-station correlation. Flaming Gorge Dam began storing water in 1963. Figure 3. -- Surficial geologic map of reach in Lodore Canyon showing typical reach with abundant gravel; the upstream debris fan is at Rkm 568.1. Fine-grained alluvium is shown by fme dots; coarse-grained alluvium is shown by heavy dots; debris fan material is shown by diagonal lines; unshaded area is bedrock and talus. Depositional environments are labeled. Figure 4. -- Map of surficial geology at Rkm 563.9 in Lodore Canyon showing typical reach with a fan-eddy complex. Fine-grained alluvium is shown by fine dots; coarse- grained alluvium is shown by heavy dots; debris fan material is shown by diagonal lines; unshaded area is bedrock and talus. Streamflow direction is indicated by arrows and the rapid is shown by wavy lines. During bankfull flow the lower one-half of the eddy bar is inundated by recirculating flow and the gravel expansion bar is mostly inundated by shallow downstream flow. Figure 5. -- Photograph of Island Park reach taken during low discharge in October 1995. The view is to the northwest, and streamflow is from right to left. Note the large mid- channel bars and wide terraces, abundant in this reach. This is termed a restricted- meander reach because the channel is intermittently constrained by bedrock on one bank and otherwise free to meander. .... Figure 6. -- Longitudinal prof1le of the Green River through the eastern Uinta Mountains is shown on the left axis. The 'f: symbols show the locations of tributary debris fans. Depth to bedrock in the river channel is shown at three bore-hole locations. The dashed alluvium-bedrock contact is interpolated from the three data points. Resistance of bedrock at river level is shown on the right axis; bedrock resistance scale adapted from Harden (1990). Figure 7. -- Example channel cross section in Lodore Canyon at Rkm 563.0. The terrace height used to estimate the pre-regulation flood level is indicated by the heavy dashed line. This terrace is composed of fine-grained alluvium and is discontinuous through the study reach. Figure 8. -- Estimated average boundary shear stress, shown by +'s, and critical shear stress, shown by . ' S . Average boundary shear stress calculated for pre-dam bankfull flow using estimated bankfull surfaces to defme channel geometry. Dashed line shows 5-point moving average of average boundary shear stress. Critical shear stress calculated from the Shields function using 0.033 for the dimensionless critical shear stress.