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<br />-;.- <br /> <br />001877 <br /> <br />. <br /> <br />. <br /> <br />-;.~ <br /> <br />GROUND WATER <br />MISSOURI RIVER BASIN <br /> <br />Progress report for quarter ending March 31, 1957 <br /> <br />Compilation of data collected during the past field season and prepara- <br />tion of interpretive reports constituted a large part of the progress made <br />during the quarter. Except for the measuring of water levels in observation <br />wells, little field work was done. <br /> <br />MONTANA <br />A first draft of a report on the Two Medicine irrigation project was <br />completed and now ie being revised. Water-level measuremente were made in <br />50 observation wells. <br />Measuremente were made of the water level in 25 observation wells ;to <br />the Hardin irrigation unit. All measurements made to date in this area were <br />tabulated, and a Il)O.p showing the location of the wells was prepared. <br /> <br />WYOMING <br />Data collected last field season in the Greybull Valley, Emblem Bench, <br />and YO Bench area (Big Horn County) were compiled and the drafting of a report <br />on the area was begun. <br />Underflow across the State line into Nebraska within the Niobrara River <br />drainage basin was estimated by use of Darcy's law. <br /> <br />COLORADO <br />Studies were continued in the South Platte River valley between Denver <br />and Hardin. Measurements of the water level in 32 observation wells were <br />made monthly, and logs for about 250 water"wells were obtained from the <br />drillers. Geologic cross sections, based on test-hole information, were <br />constructed. The specific capacity of irrigation wells between Denver and <br />Brighton were computed and the efficiency of the pumps was determined. <br />AqUifer-test data were checked. <br /> <br />SOUTH DAKOTA <br />As part of the studies in the "Lake Dakota plain" area, monthly water- <br />level measurements were made in 34 observation wells and 8 water-level <br />recording gages, 2 recording precipitation gages, and a micro barograph were <br />maintained in operation. In the adjoining Oahe Unit, water-level measurements <br />were made on 343 wells and 10 recording water-level gages were operated. <br />Water levels were measured in 98 wells in the Crow Creek-8and Lake area <br />and in 23 wells in the Angostura irrigation project. In the vicinity of <br />Fort Randall Dam 4 water-level recording gages and 2 water-pressure recording <br />gages were operated; also water levels were measured in 2 wells and in 22 <br />~iezometer tubes. <br /> <br />1. <br /> <br />~~~~~~Q~~ <br />APR 9 - 1957 <br />COLO. WATER <br />CONSERVATION BOARD <br /> <br />