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<br />during fluctuating flows can progress upstream of River Mile 310.8 when sufficient frazil ice is <br />available. However, it appears unlikely that any substantial ice cover can develop upstream of <br />Chew Bridge. <br />The breakup of the stationary ice cover in the study reach of the Green River appears to <br />occur largely as the result of thermal meltout due to water temperatures above 32°F and mild air <br />temperatures. For example, meltout rates of 1 river mile per day were observed downstream of <br />Bonanza Bridge during the 1987-88 winter. Often relatively short sections of the ice cover were <br />' observed to break up and move out more or less simultaneously during periods when melting was <br />occurring. No ice covers were reported to last past late March. <br />e <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />' 11 <br />