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Figure 1.1. Figure 1.2. Figure 1.3. Figure 3.1. Figure 3.2. Figure 3.3. Figure 3.4. Figure 3.5. Figure 3.6. Figure 3.7. Figure 3.8. Figure 3.9. Figure 3.10. Figure 3.11. UST OF FIGURES Relationships between discharge, water temperature and spawning period for Colorado Squawfish, Yampa River in 1981 and 1983 (modified from Tyus and Karp, 1989) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1.2 General and detaHecI location maps for the study reach of the Yampa River ....................................................... 1.3 Geologic map of lower Yampa Canyon showing location of inferred axis of a northwest-southeast trending anticline (modified from Untermann and Untermann, 1954) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 1.6 Topographic map showing locations of cross sections, Wolman Counts, pits and subsurface sediment samples at Mathers Hole, RM 17.5, Yampa River ............................................. 3.2 Detailed geomorphic. map of Mathers Hole study reach .................. 3.4 Aow trajectories at Mathers Hole as determined from measurement of imbrication angles of clasts that were transported in 1993 ............... 3.10 Downstream control (cross section 1 water-surface elevation) rating curve for HEC-2 model ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.12 Comparison of water-surface profiles with measured water-surface elevations at a discharge of between 300 and 350 cfs, 1993 high-water marks (Op A:I 17,600 ets) and 1984 high-water marks (Op = 32,300 cfs), MatHers Hole, RM 17.5 ..................................... 3.14 Energy gradeline elevation profiles for discharges ranging from 300 to 32,300 ets, Mathers Hole, RM 17.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3.15 Grain size distribution plots for various bar surface and subsurface sediments in the Mathers Hole study reach, RM 17.5 ................... 3.17 Computed velocity profiles for discharges ranging from 300 ets to 32,300 ets at Mathers Hole, RM 17.5 ............................... 3.19 Cross sectionally averaged dimensionless grain shear stress ('t"') for discharges ranging from 500 to 32,300 ets, Mathers Hole, RM 17.5 . . . . . . . .. 3.20 Maximum dimensionless grain shear stress (t 'Ie') for discharges ranging from 500 to 32,300 ets, Mathers Hole, RM 17.5 ................. 3.22 Variation in dimensionless grain shear stress (t'le') at cross section 3, Mathers Hole, for two values of dimensionless critical shear stress ('t *c) at discharges ranging from 300 to 32,300 cfs. The median size of the bed material is 84 mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 3.23 ii Resource Consultants & Engineers, Inc.