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I I I I I I I I I I I I I I I I I I I is 2.1 feet. At 3000 cfs these depths are 5.2 and 4.4 feet respectively. When the Gunnison River reaches flows at or above 11,600 cfs, the ladder becomes submerged. Under these conditions, velocities in the ladder remain within the acceptable range for the swimming capabilities of the target species. However, these fish may also be able to pass directly over the dam along the riverbanks. Flow characteristics in the ladder for the range of design river flows are calculated in conjunction with the hydraulic analysis of the alternative presented in Section VII. Table 7.2 summarizes the results. 6.1.4 Attractive Flow The inlet for the attractive flow pipe is located between the ladder exit and the dam as shown on the drawings. To minimize the length of the pipeline, the inlet is located as close to the dam as can reasonably be constructed. The distance from the pipe inlet to the ladder exit is also a function of maintaining a 50-foot separation between the pipe inlet and fish exit. The intake design includes a screen for trash and debris. 6.1.5 Access Access to the fish ladder would be from the east side. Existing roads from the east are available up to approximately 1000 feet from the bank of the diversion dam by following Highway 92 for 3 miles east of Delta to 1800 Road, north on 1800 Road for % mile to H75 Road, and east on H75 for % mile to 1678 Road. At this point, a new road is required to the diversion structure. For the purposes of this analysis it is assumed that the road is a 1 a-foot wide gravel road, approximately 1000 feet long. This access road requires at least one culvert to cross an existing ditch. This road also requires an easement as it is on private property. 6.2 Alternative II Fish passage for Alternative II is depicted on Drawing 3 in Appendix A. This alternative includes the construction of a ladder that utilizes boulders to create a riffle and pool sequence 26