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
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