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xii . List of Figures Final Report Fig. 4-3. Fig. 4-4. Fig. 4-5. Fig. 4-6. Fig. 4-7. Fig. 4-8. Fig. 4-9. Fig. 4-10. Fig. 4-11. Fig. 4-12. Fig. 4-13. Fig. 4-14. Fig. 5-1. Fig. 5-2. Fig. 5-3. Fig. 5-4. Fig. 5-5. Fig. 5-6. Fig. 5-7. Fig. 5-8. Fig. 5-9. Fig. 5-10. Seasonal longitudinal warming of the Colorado River under interim flows from Glen Canyon Dam to Diamond Creek, as mean daily temperatures at six stations for WY 1992. The USGS gage below Glen Canyon Dam is 15.5 miles upstream of Lees Ferry ...................................................................... 4-4 Mean daily temperature of the Colorado river at four USGS stations (Lees Ferry, Above LCR, Grand Canyon, Diamond Creek) during 1991 research flows of constant 5,000 cfs (May 16-20, May 31-June 3), constant 15,000 cfs (May 21-30), and normal summer fluctuating flows (June 4-27). Diagonal dashed lines represent approximate travel time for flow to reach each of the four designated stations ...................... 4-5 Mean daily temperature of the Colorado River for WY 1991 at six stations (Glen Canyon Dam, Lees Ferry, Above LCR, Grand Canyon, National Canyon, Diamond Creek) ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Mean daily temperature of the Colorado River for WY 1992 at six stations (Glen Canyon Dam, Lees Ferry, Above LCR, Grand Canyon, National Canyon, Diamond Creek) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 Mean daily temperature of the Colorado River for WY 1993 at six stations (Glen Canyon Dam, Lees Ferry, Above LCR, Grand Canyon, National Canyon, Diamond Creek) .......... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . '.' . . . . . . . . . . . 4-8 Predam (WY 1947-1957) and postdam (WY 1967-1971) average daily sediment concentrations (mglL) near Grand Canyon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 Relationship between Secchi depth (D) and turbidity (NTU) for the Colorado River in Grand Canyon ............................................................. 4-10 Relationship of flow to Secchi depth during a transition of high fluctuating releases (7,000-25,000 cfs) to constant 5,000 cfs, May 10-23, 1991 ..........................4-10 Daily mean, minimum, and maximum temperature of the LCR for WY 1991, 1992, and 1993. GCES Ryan Tempmentordata .......................................4-11 Mean daily temperature of Bright Angel Creek (A) from November 1990 through March 1993 (USGS AOAPS data) and Shinumo Creek (B) from October 1990 through June 1993 (GCES Ryan Tempmentor data) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Mean daily temperature of Kanab Creek (A) from October 1990 through October 1993 (GCES Ryan Tempmentor data) and Havasu Creek (B) from January 1992 through June 1993 (GCES Ryan Tempmentor and USGS ADAPS data) ..............4-14 Locations of eight springs in the Fence Fault area, as represented by Huntoon (1981) .......................................................................... 4-15 Conceptual chronology of relative abundance of fish species in Grand Canyon from 1800-1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9 Percentage of adults and subadults of common fish species by study region, 1990- 1993 ................... .' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12 Number of species, species diversity, and biomass of native and non-native fish species by geomorphic reach from Lees Ferry to Diamond Creek ........ . . . . . . . . . . . . 5-13 Gill and trammel netting effort (hours) and CPE(AMcpE # fish/100 ft/100 hr) for adult and subadult humpback chub (HB), f1annelmouth sucker (FM), bluehead sucker (BH), rainbow trout (RB), carp (CP), and brown trout (BR) in 11 geomorphic reaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 5-14 Electrofishing effort (hours) and CPE (AMCPE # fish/10 hr) for adult and subadult humpback chub (HB), f1annelmouth sucker (FM), bluehead sucker (BH), rainbow trout (RB), carp (CP), and brown trout (BR) in 11 geomorphic reaches ................ 5-15 Archeological finds and predam and postdam capture locations of humpback chub in the Colorado River, Grand Canyon ........................................... 5-19 Numbers of humpback chub captured by river mile from Lees Ferry to Diamond Creek by BIOIWEST, October 1990 - November 1993 (A), and by Maddux et al. (1987), April 1984-June 1986 (B) .............................................. 5-24 Arithmetic mean catch per effort (~ for subadult humpback chub (<200 mm TL) captured with electrofishing, minnow traps, and seines along shorelines between RM 61.3 and RM 65.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26 Locations of nine aggregations of humpback chub with percentage of adults captured in the Colorado River in Grand Canyon. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-28 Monthly geometric mean catch per effort (GMcPE, # fish/100 ft/100 hr) for adult humpback chub captured in nets within RM 60.0-61.9 (LCR inflow), 1991-93 . . . . . . . . . . . 5-30