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<br />00061~ <br /> <br />All streams, except the Missouri main stern, annually exerience water <br /> <br />shortages, especially after mid-July with water quality deteriorating as the <br /> <br />flow decreases. <br /> <br />Deerfield Darn is in need of modification as a result of reevaluation under <br /> <br />the safety of dam program. Revised design flow criteria showed the need to <br /> <br />increase the height of the structure and to rehabilitate and reinforce the <br /> <br />spillway. Work has been authorized and funds appropriated. Construction to <br /> <br />start in 1980. <br /> <br />Sedimentation in Angostura Reservoir is a problem and needs continuous <br /> <br />monitoring. <br /> <br />Federally certifiable land irrigation suitability needs to be established <br /> <br />for subbasin Indian reservations in order to help establish substantiated <br /> <br />Indian irrigation associated water rights. <br /> <br />with the exception of the pine Ridge Unit, Federal irrigation studies of <br /> <br />the Grand, Moreau, Cheyenne, Lower Belle Fourche, Bad, and White Rivers are <br /> <br />technologically outdated, being 25 to 40 years old. Irrigation potential needs <br /> <br />to be reevaluated. <br /> <br />LAND CONSERVATION AND MANAGEMENT <br /> <br />Streambank Erosion <br />, <br /> <br />Bank erosion is a significant problem which is causing the loss of <br /> <br />agricultural lands and is threatening residences along the Missouri River <br /> <br />between Garrison Darn and Lake Oahe. Severe erosion of agricultural lands also <br /> <br />occurs in tributaries such as the White River. <br /> <br />Battle Creek and Bear Butte Creek have erosion and sedimentation problems. <br /> <br />Upland Soil Erosion <br /> <br />Upland erosion problems are especially significant in the Little Missouri, <br /> <br />Grand, Moreau, Cheyenne, Bad, and White Rivers. <br /> <br />H-13 <br />