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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I: <br /> <br />pastures or hay fields, Large boulders are generally lacking in this reach, the gradient is <br />flat and 'the substrate is dominated by sand. <br /> <br />Hydrographs that summarize the 82-year period of record for the MaybelI gauge <br />and flow were given in the 1998 progress report (Anderson 1998). The mean monthly <br />flow for September 1998 (188 cfs) was less than the average of the mean monthly flows <br />for the period of record for September (250 cfs). The August (495 cfs) and October (373 <br />cfs) mean monthly flows for 1998 were higher than the average of the mean monthly <br />flows for the period of record for August (391 cfs) and October (354 cfs). The minimum <br />flow during the study period occurred on September 12, at 115 cfs (Figure 2), and was <br />close to the median minimum flow (129 cfs). Flow was less than 150 cfs for a total of <br />five days in 1998 and was under 200 cfs for 23 days. <br /> <br />I; <br /> <br /> <br />N <br /> <br />W*E <br /> <br />s <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />! <br />., <br />j <br />.. <br />.. <br />{ <br />~ <br /> <br />..,. M'P" R\'JER <br /> <br />10 <br /> <br />o <br /> <br />10 Miles <br /> <br />Figure 1. Location of the Sevens and Duffy habitat sampling stations, Yampa River. <br /> <br />3 <br />