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...-.~ ,..... 001874 . ~ ~.,,,nrf'\f~ U/.. ~.\iC'.\F\;"':" o'\.)J J r;'-""'" .,-+ c'.. . 51 . oel 1 \) \9 r()' () ~t~,\ lR ~.. Il\lO~\l.D to"StR~~1\() GROUND WATER y MISSOURI RIVER BASIN Progress report for quarter ending september 30, 1957 Active field studies were in progress on three projects in Montana and on one project in each of Wyoming, Colorado, and South Daltota. In these States, and in the other States in the Missouri Basin also, measurements of the water level in observation wells were made in project areas where field studies previously had been completed. The writing and review of field drafts of reports on completed field studies was continued. MONTANA The detailed study of the terrace lands above the Two Medicine irrigation canal in Glacier-County, begun this qUarter, consisted of locating and mapping the bedrock surface on which the terrace gravels rest. The position of the gravel-bedrock contact was determined by excavating pits and by auguring test holes. The study of irrigated and irrigable lands in the lower Bighorn River valley was continued. All wells on lands proposed for irrigation after the Yellowtail Dam is built were inventoried, also some wells on the bottomlands that now are irrigated. The surface geology of northeastern Blaine County was mapped by reconnaissance me.thods. Almost all nlls in the area were examined and pertinent data were recorded. The water-yielding capacity of the Flaxville gravel underlying the IJogeland..Turner upland plain is being studied. WYOMING Field studies in the Greybull Valley-Emblem Bench-YO Bench area (Park and Big Horn Counties) were completed. A report on the investigation is being written. COLORADO Field studies in the upper South Platte River valley between Denver and Hardin included the examination of about 150 wells and the recording of information about them, the monthly measurement of water levels in 32 observation wells, the collection from ~rells and streams of 45 ~1ater samples for chemical analysis, and the reconnaissance mapping of Boxelder Creek valley, Beebe Draw, and the South Platte River valley between Brighton and J Kersey. SOtml DAKOTA The field draft of a report on the investigation of the "Lake Dakota plain" area ~1aS completed and was given a preliminary review. In addition to the periodic water-level measU1'ements made in 199 wells in that area, 8 water..level recording gages, 2 rain recording gages, and 2 recording barometers were maintained in operation. Elsewhere in the Oshe Unit, 1.