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The rate of decline in the razorback sucker population in the Colorado River apparently <br />accelerated markedly after 1980. It is not a coincidence that the near extirpation of the razorback <br />sucker occurred shortly after the loss of the Colorado River Overflow as a spawning area. <br />Neither the razorback, nor the squawfish, is believed to have made significant use of Plateau <br />Creek. The roundtail chub, however, has been common there for many years. In his 1977 paper <br />(Kidd, 1977), Mr. Kidd suggested that there may have been a relict population of squawfish <br />present between two irrigation diversion structures on the Colorado River in DeBeque Canyon. <br />Personal observations since that time have led him to recant this suggestion as he no longer <br />believes that any such population existed. While working for CDOW, Mr. Kidd and his field <br />crew discovered the humpback chub population at Black Rocks (Kidd, 1974), but he has never <br />collected a specimen of the bonytail chub in the Upper Colorado River. He believes that the <br />bonytail chub probably was never present in the Upper Colorado River above the Black Rocks <br />area, and that the humpback chub is limited to the very restricted habitat of the deep pools of the <br />Colorado River canyons (Kidd, 1977). <br />4C7MMRT=AWpP-C.WWE