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t `~#,, _ :~7'ti .t +~ - 1 -~« ~; ~- t~-e I®wer Green River as recently as 1959 (Bosley, 1960). In _ -~ zacent years, however, strict water pollution laws- have helped -_ reduce pollution drastically. The towns of Green ;River and Rock Springs have installed sewage treatment plants, and there has been 12 - a substantial decrease in pollutants from the railroad yards at Green River City. Some wastes still enter the river from the small towns. ~~~_and_oil_fields; and an examination of the- river bed, during low-water __ _„ reveals the occasional presence of oil-covered bottom areas, residual from past oil pollution, The gradue.l disappearance of fish species, such as the Colorado River squawfish (Ptychocheilus Iucius Girard), once relatively common near Green River City (Jordan and Evermann, 1908) may be attributed- to historical pollu- tion conditions. The longitudinal gradient of the Green River in the study area is shown in Figure 2. While flowing through the study area, the river moves from an elevation of 7, 000 feet above sea level to one of 5, 600 feet. The New Fork River gradient profile is not shown in Figure 2, but it changes in elevation by only 200 feet in - the 26 miles included in the study area, For the purposes of the present study, the Green River was - divided into four sections: (I) The New Fork River, (II) the Upper Green River, (III) the Middle Green River, and (IV) the Lower -- __e~. Green River (Figure 3). Section T includes the New Fork River