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Number Fb" 16 Honey mesquite habitat being cleared for agriculture .............. 18 17 All American Canal originating at Imperial Dam delivers water to the Imperial and Coachella Valleys ........................... 19 18 A-ha-Quin Trailer Park north of Blythe, CA ........................ 19 19A View of mature cottonwood-willow habitat in 1894, from the U.S.-Mexico International Boundary Monument 207, facing southeast ....................................................... 22 19B Same area as in (A) in 1976 ................... ,.............. ...... 22 19C View of-mature cottonwood-willow habitat in 1979 near the Bill Williams Delta with Lake Havasu, AZ...., ......................... 23 19D Same stand as in (C) after 2 years of flooding .................... 23 20A Five months after burning of a saltcedar-honey mesquite habitat at Cibola National Wildlife Refuge............................ ...... 25 20B Two years after a burn with vigorous growth evident for saltcedar, but not for native trees ........................................ 25 21 Vegetation, mostly saltcedar and honey mesquite, flooded during 1983 ................ , .... ..... ........... ........... ........... 27 22A Three species of southwestern big-river fish that were once abundant in the lower Colorado River ...................•••••••••• 27 22B Colorado squawfish (Ptychochellius lucius) is extirpated from the Colorado River below Glen Canyon Dam ............................ 28 22C Razorback sucker'(Xyrauchen texanus) still can be found at Lake Mohave and a few other localities in the Lower Colorado River, but natural recruitment is virtually unknown .................... 28 23 Yellow-billed cuckoo (Coco zu_s americanus) with katydid in a Goodding willow.... .............................................. 28 24 Yuma clapper rail is the only bird species on the Federal endangered species list with the center of its distribution on the lower Colorado River .................••••••••••••••••••••••• 29 25 Patterns of monthly discharge of the lower Colorado River mainstream at various points between Davis Dam and the U.S.- Mexico Boundary, 1974 through 1976 .............................. 36 26 Monthly salinity levels below Lake Powell ......................... 37 IX