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<br />IV. TRIBUTARY RUNOFF AND FLOODS. <br /> <br />a. General Hydrologic Conditions. <br /> <br />(1) Long-Term Trends. <br /> <br />The generally moist conditions, which have dominated the District since <br />1993 continued during 1997 and 1998. The dry conditions which had invaded <br />Colorado, Montana and Wyoming in late 1 996 had been largely eliminated by the <br />late summer and early fall of 1997 as shown in Figures 1 and 2. While dry pockets <br />remained in portions of the Rocky Mountain States, more than 75% of the District <br />had average to above average moisture conditions, as defined by the long-term <br />Palmer method. <br /> <br />" <br /> <br />. <br /> <br />Average to above average moisture conditions continued into Spring 1998, <br />with only one area near Ft. Peck, Montana showing sub-par moisture as shown on <br />Figure 3. Wet to excessively wet conditions continued over the eastern part of the <br />District, while the HFort Peck dry pocketH expanded southward into Wyoming by <br />late July 1998, as shown on Figure 4. Some areas of the District, notably <br />northeastern South Dakota continued to experience excessively wet conditions for <br />the 6th or 7th year in a row. <br /> <br />, <br /> <br />, <br /> <br />4 <br />