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<br />00003S <br /> <br />1. Investigatio,1s relative to range-Hater development llere <br />made on lands under jurisdiction of the Bureau of Land Management <br />near Hayollorth, Wyoming, on the North Fork of the POllder River a,1d <br />in Wyoming Grazing District 3, lIest of the Pathfinder Reservoir. <br /> <br />2. Erosion studies lIere ::lade in several areas throUGhout <br />W~'oraing and Montana Hi th the major portion of the Hork being done <br />in the Hind River Basin and in the North Platte Basin above the <br />Glendo Reservoir. <br /> <br />3. In the i.find River Basin, the Honeta Reser,oir and Drainace <br />Basin study continued and expanded ,,1ith the establishnent of a <br />systen of courses for the observation of sheet erosion. Check <br />surve:'s llere made on gull:.' progress plots in the draina:;e basin of <br />Bad1later Cree]:. General studies uere made on the Five lIile and <br />11uddy Creek channels during the 1947 field season and an intensive <br />study covering all phases of the current erosion and the erosion <br />potential in the upper parts of the drainage basins of these creeks <br />on the Hind !liver Indian Reservation "as started in June 1948. <br /> <br />4. In the Glendo area, records of water stage and silt level <br />1Iere continued on the Bolton Trail Reservoir a:1d similar rGcords <br />Here established on a reservoir built on the Interagency Bolton <br />Demonstration Area "ith erosion courses being established above <br />both reservoirs. Studies continued on the channels and fills of <br />Bolton and Bates Creel:s and their tributaries. <br /> <br />5. In the POHder River Basin, a gully progress plot near <br />Broadus, Montana, Has establishGd and surveyed. In the llilk River <br />Basin, headcuts aZld a reach of channel of WHloH Creek near Glasg01I, <br />Montana, where .surveys and other exaninations of the erosion in <br />the drainage basin HerG made. <br /> <br />Geologic l-lap'Jinrr and Hineral Investii'atio:15. <br /> <br />NeH mapping projects Here underta1:en during the fiscal year <br />in the Hardin-YelloHtail, Stanford-Hobson, and Judith 1.low1tain <br />areas of !-Iontana, and the 1I00rhead and Hind River Basin areas of <br />Uyominc. All of the additional mapping needed for the llissouri-. <br />Souris area of Hontana a:J.d Horth Dalcota and. the Knife River area, <br />North Dakota, Here initiated. <br /> <br />A gcophysical survey, ~J electric rcsistivity, of the Medicine <br />Lake area in 110ntana beGan in June. This r:Jethod is proving success- <br />ful in detenJinins the thickness of thc Glacial deposits and fill, <br />and is particularly useful in tracing thc buried chall!1ol of the <br />formcr Missouri River. <br /> <br />71 <br />