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<br />Fig. 2 <br /> <br />~ <br /> <br /> <br />Missouri River below Holter Dam, Montana, showing differences between <br />flows of 3,000 cfs (55% of the average flow) and 2,000 cfs (37% of the <br />average flow). The vertical drop was 7 inches. Flows reduced about <br />midnight will clearly reveal differences in wetted substrate when photo- <br />graphed the next morning (photographic "regression analysis"). <br /> <br />MRBS Photo #9000 <br />by Don Tennant 6/10/70 <br /> <br />6 <br />