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<br />., <br /> <br />ECOLOGY OF RIVERINE FISHES IN REGULATED STREAM SYSTEMS <br /> <br />65 <br /> <br />(Fig. 1). The Gila River system of Arizona, a major tributary, is <br />dammed and diverted, so no flow enters the Colorado much of the year. <br /> <br />The upper Colorado Basin remained free flowing until the 1960s, <br />when the Colorado River Storage Project dams were completed. The <br />dams of greatest significance to the native riverine fishes were <br />Flaming Gorge Dam on the upper Green River; the Curecanti Dams on <br />the upper Gunnison River, the major tributary to the upper Colorado <br />mainstem; Navajo Dam on the San Juan River; and Glen Canyon Dam on <br />the Colorado River (Fig. 1). All are high dams, creating large <br />reservoirs and releasing cold downstream flows in summer. All but <br />Navajo Dam are hydroelectric, with daily fluctuating flows. <br /> <br />The dams in both the upper and lower basins have adversely <br />affected the four native species and are a major reason for their <br /> <br /> <br /> <br />NEVADA <br /> <br />--T-- <br /> <br />I <br />, <br /> <br />;"" <br /> <br />WYOMING <br /> <br />NEW MEXICO <br /> <br />Fig. 1. Map of the Colorado River Basin showing major impoundments. <br />