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b~ <br />~,,nd river mileages obtained from aerial photographs and topo- <br />_ graphic map measurements. <br />The one mile per hour velocity figure used in the predictions <br />v"vas" obtained during the 19b1 trial treatment. Though some depar- <br />-tares from this velocity were expected, especially on the upper <br />river, it was believed to be fairly representative of the overall <br />velocity. Rotenone arrived at the various stations from 30 minutes <br />to nearly four hours earlier. than predicted, indicating. that the <br />water velocity was greater in some sections than had been antici- <br />pated. <br />Arrival of the rotenone from an upstream station at the next <br />downstream station before its operation was terminated usually <br />insured that fish escaping ahead of the rotenone were trapped and <br />killed. The converse of this situation occurred on the New Fork <br />River when the rotenone from station #1 did not reach station #2 <br />before rotenone discharge had been discontinued for several hours. <br />Thus, there was a possibility of a zone of untreated water in the <br />New Fork. However, as there was still rotenone present in the <br />Green River when it received untreated water from the New Fork <br />River, any fish moving down the New Fork in this water should <br />have been trapped at the confluence of the two rivers. Retreatrnent <br />of the New Fork River several days later revealed that the only <br />:..-~ , <br />_~ <br />fish in the mainstream were restricted to the upper five miles. <br />