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16 THE GREEN RIFER AND ITS L I'ILILAi,v.N feet. The source consists of a number of small glacial lakes, e from these the stream flows a little, east of north through a rug, canyon for at least 15 miles. At the lower enl of the canyon a Wan gateway through the hogback ridges at the foot of the flanks of mountains opens into a broader, more open canyon, which eventui merges into the rolling plain that forms the lower part of the bai Near Lonetree, ` vo., Henrys Fork swings eastward for about miles, then southeastward, crosses into Utah and empties into Green River 3 miles south of the State line. Its principal tributa are Beaver Creek and Burnt Fork. YAMPA AND WRITE RIVER BASINS GENERAL FEATURES The basins of the Yampa and White Rivers comprise the en b- northwest corner of Colorado, a small part of southern liyom and a small part of eastern Utah. They are treated together beca. they have similar characteristics and because certain irri- projects contemplate the use of the waters of the. White for irriga } lands in the Yampa Basin. The foothills of the Park Range lie along the east side of area; the north side merges into the broad open country of the Gr.,. River Basin in Wyoming; the east end of the Uinta- Nlourt occupies the northwestern part; and the )'lliite. River Pallev along its southern border, extending westward into the Uinta B is The combined area of these two basins is about 12,830 square 7,950 square miles in the Yampa River Basin and 4,850 square in the White River Basin. The altitude ranges from 4,640 at the mouth of Vlnite River to 14,000 feet at the crest: of the Mountains, on the eastern boundary. Some portions of thus .consist of open or comparatively level country, but much of made up of rolling hills flanking those higher portions which,xi, properly be called Iountains.° Besides the east end of the Uinta Mountains, several other pi inent topographic features lie within the area. The Dauforth rise between the Yampa and Wh'te Rivers in the eastern part- Tampa Plateau and Midland Ridge are conspicuous features southwestern part; and Juniper and Cross Mountains, two h lls east of and in line with the Uinta Range, rise abruptly out basin Qr broad valley through a pari of-which the Yampa River which has been designated Axial Basin. Southwest, of the Y- ang , Pls?ai and extending westward to a point beyond the Gran are P Yellow Hills, agroup -of logy, rounded naked hits IrL_?_ tn-ye , w clay and shale 'hai constitute he ground ??1+ bFhi e,'C, A On the nlogq and phq Phy of "Parts r northwestern .:. A-1 a' LtaR and Wyoming: U. S. Geol. Survey Ninth Ann Rapt.; P. F:94, 1889. , 71 ?; P• - 1 c of the shale is slate colored, and some is pink, with soft and ?;1rate tint,. A network of wet -weather channels descends rapidly tco and the Green River, and the intervening hills are entirely des- of vegetation. South of the Yellow Hills and separated from by a well-defined ridge is a broad stretch of red and buff bad a>>,ls which extend southward beyond the White, River and consti- ;ii±c the lower part of the White River Basin. Beyond the river the a4c?n c structure appears, somewhat like that in the Alcove Land, near Green River, Wyo., and this district was named "Goblin City" i.r a member of Powell's party." PRINCIPAL STREAMS The Yampa River is a striking example of the seeming disregard of Wring conditions of location thatismore orless ebaracteristic of the River at several places along its course. The Yampa is fed by ;,;?merous small tributaries that drain the western slopes of the Park Fame. Its upper course is turbulent for many miles through rocky aes and narrow valleys. After emerging from the foothills it ,:,,verses the open country that lies toward the v, est, its general direc- t cn being toward- the east end of the Uinta Range and along the _ _reatcr part of the length of Axial Basin. Juniper and Cross Moun- tains lie directly in the way of the stream, and around these mountains are low-bring lands through which the stream might have gone with apparent ease. But upon reaching Juniper Mountain the ricer cut it- way by a short canyon through the hard rocks that form the.north- mi flank of the mountain, instead of swerving a little and passing around the mountain. This canyon is about 21,2' miles long, and its Rallis ere only a few hundred feet in maximum heiht above the stream led For 32 miles after leaving Juniper Canyon the river flows tiauui, It the rolling sage-covered prairie lands of Axial Basin to Cross 11c untain, through which it cuts another canyon in a similar manner. his canyon is about 3 miles long and is a narrow defile with almost vertical rock walls, which reach a maximum height of about a thousand `eet or more above the low land at each end of the canyon. For 11 miles below- Cross Mountain-Canyon tbe-river has a peaceful course -- - through Lily Park, which is a broadening of the valley, and here it :rceives the waters of the Little Snake River, the last tributary of any L^.Iportance. Then, instead of joining the Green River by way of the ioN land at either the north or the south side of the Uinta Range, it ?aters the east end of the range, and the remainder of its course is througb the narrow Blue Mountain Canyon, which extends westward 4•.) rniles through the upturned strata of the Uinta Range and joins. Elie canyon of the-Green River near-the Colorado-Utah line. °0¢°11.7. -'., Esp;oration of the Colorado River of the;west and its a rotaries, rBPbdB74, p, 467, 40150--3t1- 3: