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14 THE. GLEN RICER AND ITS CT AZATION UPPER GREEN RIVER BASIN 15 <br />canyons until they reach the Green River Valley, and their flow" <br />contributed by many small tributaries within the mountain area.,1 <br />The East Fork is the largest tributary of the Green River abol <br />Green River, Wyo. It drains a part of the western slope of to <br />Wind River Range extending from Fremont Peak on the north <br />Twin Buttes on the south, a distance of 45 m1es. The run-off fro <br />the greater part of this drainage area is carried by the New Fa <br />River, the main tributary of the East Fork. The source of the Ni <br />Fork River is in the region of innumerable small glacial lakes imme <br />ately west and south of the headwaters of the Green River, at <br />altitude exceeding 11,000 feet. The New Fork River rises in a chi <br />of these small lakes and flows southwestward 9 miles to the New Fc <br />Lakes, which cover an area of about 2 square miles and are 7,9 <br />feet above sea level. These lakes rest on a glacial plateau wl <br />fianks the. Wind River Mountains and extends for a distance of abi <br />30 miles southward, having a width of 3 to 5 miles, and from wh <br />there is an abrupt drop to the main valley floor of the New Ft <br />- River. Below the New Fork Lakes the stream has cut a chain <br />through the outer edge of this plateau and descends rapidly until <br />reaches a point about 2 miles from the lakes; then it turns abrup <br />to the southeast and continues in that direction on a very much flai <br />grade to its confluence math the East Fork. From this point:; <br />course of the East Fork is southwestward to its junction Nith <br />Green River, near Big Piney. A number of tributaries enter <br />New Fork River along its course. In order of their position do' <br />stream the main ones are 'B'illow, Pine, Pole, and Boulder Cr6 <br />Like the New Fork River, all these streams rise in a number of ?s1 <br />lakes on the western slope of the Wind River Range and flow thro <br />lakes on the plateau above mentioned. Each stream fails ra_ <br />ss it drops from the plateau lakes to the New Fork River both <br />North, Middle, and South Piney Creeks, with respective dra <br />_ areas of 129, 112, and 110 square miles, rise in the Absaroka Ric <br />the -southern extension of the Wyoming Range and.flow,easts <br />through short canyons to the undulating floor of the Green 11 <br />Valley, thence in shallow depressions across the valley, finally jai <br />the river near Big Piney. All the streams receive numerous E <br />tributaries in the mountainous part of their courses but prat tie <br />no -of. after leaving the mountains. „These st, <br />perennial-Tim <br />are apparently the same as those designated White Clay, Bitter <br />and Piney Creeks, respectively, by the Hayden Survey a in 1877, <br />Labarge Creek has a c?aira?ge arms of Lob squats mules. It <br />the ear?t slopes o the Alga*4ka lt? <br />At an altitude of n ?,00r ? fept aP 1?? <br />flows southward until it re,aCeS',the valley flocr and thew. east <br />10 miles to its confluence with the Green Rover; Aft !Garr; <br />i Fgpyaa, F. V., or;. Cit., P. bTl. <br />;:ountaias, through which it flows in a narrow valley between the <br />edges, it is bordered on the north by low, flat country and on the <br />south by a plateau area that separates it from Fontenelle Creek. <br />This plateau surface is virtually shredded by erosion. <br />Fontenelle. Creek drains a mountainous area of 239 square miles. <br />It was named after one of the best known of the early fur traders of <br />this region. Its course is southeasterly through a narrow valley <br />!ordered on each side by low bluffs, which rise to the, level of a sage- <br />covered plateau. Several small tributaries empty into the stream in <br />the mountains, but no perennial tributaries enter below the mountains. <br />sandy Creek is the only perennial tributary of the Green River <br />iron the east between the East Fork and the Utah line, a distance <br />?d nearly 200 miles. It rises in the Find River Mountains and <br />U." Ems about 100 square miles of country between the basin of the <br />East Fork on the west and the North Fiatte River on the east. The <br />source of Sandy Creek consists of a number of small lakes between <br />x1,000 and 10,000 feet above the sea, and from these the stream <br />flows in a southerly direction, leaving the mountains and joining <br />tie Green River in the southern part of T. 22 N., R. 109 W. Bellow <br />the mountains Sandy Creek receives but one tributary, little Sandy <br />Creek. Aside from the very small mountainous area, the basin is <br />a generally level plateau.'O''The stream leaves the mountains as a <br />full-grown river and immediately turns to the south,-flowing down <br />the east side of the valley close to the base of the mountains. <br />Blacks Fork, one.of the chief tributaries of the Green, is the only <br />perennial stream that enters between the mouth of Sandy Creek <br />and the Utab State line. It drains a large area in the southwest <br />corner of Wyoming, extending from the south end of Meridian <br />Ridge of the Wyoming Range, on the north, to the Uinta Moun- <br />tains on the-south, and from the basin of the Bear River, which <br />includes a narrow strip adjacent to the LTtah'Ene on the west, to the <br />Green River on the east. Blacks Fork rises on the northern slope <br />of the Uinta Range at the_base of Tokewanna Peak-_aad. Mount <br />Levenia, which stand 13,200 and 13,250 feet respectively shove sea <br />level. It flows northeastward as far as the Union Pacific Railroad 15 <br />miles west of Granger where it is joined by Muddy Creek. From <br />this point it flows east for 30 miles, then turns south and pursues <br />e Funding course to its mouth, about 16 miles south of the town of <br />Green River. The only perennial tributaries besides Muddy Creek <br />are Smith Fork, arhich enters from the south" about 12 miles above <br />Muddy Creek, and Hams .Fork,` which enters-from the north'",i <br />Granger, <br />Beans Ford &atns "644 sgi ,re miles of the north slope of the <br />t nta Range in l;tah and.?Ppbnun;:. It rises just east of Blacks <br />cork at the foot7of Gilbert Pcak,_which stands- at an altitude of 13,422