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INTRODUCTION <br />This report discusses data collection for the Colorado Division <br />of Wildlife (CDOW) Colorado squawfish (Ptychocheilus lucius) and <br />humpback chub (Gila cypha) monitoring program for 1983 and 1984. <br />It also summarizes threatened or endangered fish captures from 1978 <br />through 1984. <br />Because of emphasis on data analysis in 1983, sampling was <br />reduced considerably. In 1983, work was started to develop a <br />sampling program that would reduce manpower and expenses, but <br />provide adequate monitoring of endangered fish populations. The <br />reduced population and habitat monitoring program for adult <br />squawfish was initiated on the Yampa River after spring runoff in <br />1984. A record peak maximum discharge of 33,200 cubic feet per <br />second (cfs) occurred at Deerlodge Park on May 18, 1984 (Duncan et <br />al. 1985). Severe flooding made boat work and access to the river <br />nearly impossible and extremely hazardous. The usual runoff <br />habitats were completely inundated and widespread flooding had <br />occurred on adjacent low-lying areas including agricultural land, <br />sagebrush steppe, and cottonwood bottoms. During the spawning <br />sample period in August, we noted extensive channel changes in <br />areas originally selected for sampling. Access to some sampling <br />areas was no longer possible at low water levels due to the <br />dramatic riverbed changes during high water. <br />As a result of knowledge gained during the 1984 sampling <br />season, we recommended additional changes in sampling locations, <br />distances of areas sampled, and times and temperatures of sampling. <br />The majority of the habitat census was postponed until 1985, which <br />hopefully will be a more typical flow year during which all flow