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Last modified
1/26/2010 12:47:07 PM
Creation date
10/11/2006 11:22:50 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8221.110.J
Description
Juniper-Cross Mountain Project
State
CO
Basin
Yampa/White
Water Division
6
Date
9/1/1981
Title
Water Resources Appraisal For Hydroelectric Licensing: Yampa River Basin - Colorado & Wyoming
Water Supply Pro - Doc Type
Report/Study
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<br />.- <br />... <br />~ <br />~ <br />.... <br /> <br />Description of the Basin <br /> <br />t.. <br /> <br />is dotted with numerous shallow, flatbottomed depressions, many of which <br />contain lakes. The borders of the plateau are approximately 1,000 to 2,000 <br />feet above the surrounding terrain and have vertical cliffs, angular mesas <br />and steep-sided canyons. <br /> <br />The eastern end of the Uinta Mountains extends in an east-west alignment <br />across the southwestern corner of the basin. This area consists of a cen- <br />tral platform with broad slopes about 8,000 feet in elevation and bordered <br />by abrupt slopes on the north and south. The most outstanding features of <br />this area are the canyons which have been cut through the mountain range to <br />depths of as much as 3,000 feet by the Yampa River. <br /> <br />Along the south-central side of the basin is a prominent topographic feature, <br />the Axial Basin, formed by an uplift whose axis has been deeply eroded expos- <br />ing underlying soft rocks which form a sharply outlined trough. Two isolated <br />mountains, Juniper Mountain and Cross Mountain, rise abruptly from the floor <br />of this trough. The Yampa River cuts through both of these mountains in deep <br />canyons. Along the south side of the Axial Basin is a low range of hills, <br />the Danforth Hills, lying about 2,000 feet above the adjacent valleys. North- <br />east of the Axial Basin, the Williams Fork Mountains are a high hogback ridge <br />formed by resistant sandstone layers. <br /> <br />The Elkhead Mountains in the east-central part of the basin consist mainly of <br />flat-lying soft sedimentary rocks protected by basalt flows. The highest <br />peaks reach elevations of 10,000 to 11,000 feet. <br /> <br />The remainder of the Yampa River basin, lying within the Wyoming Basin phys- <br />iographic province, is an area of diverse topography containing broad plains, <br />gently-sloping ridges and rough badlands interspersed with hogback ridges and <br />low mountains. Most of the area lies between the 6,500 and 7,500-foot eleva- <br />tion. Low dunes of sand and silt are locally prominent features especially <br />in alkali areas where the scarcity of vegetation permits the soil to drift <br />into low hummocks. <br /> <br />Climate and Hydrology <br /> <br />The climate varies from the arid desert of the lower basin to the alpine zones <br />along the Continental Divide. The eastern boundary of the basin reaches crest <br />elevations of over 12,400 feet above sea level while the valley floor at Echo <br />Park in Dinosaur National Monument is about 5,000 feet in elevation. The mean <br />annual temperature at Steamboat Springs is 39 degrees Fahrenheit, with extremes <br />of 99 to -54 degrees Fahrenheit. Craig's mean annual temperature is 42 degrees <br />Fahrenheit, with a recorded high of 100 and a low of -43 degrees Fahrenheit. <br />Dixon has a mean annual temperature of 42 degrees Fahrenheit, with a high of <br />97 and a low of -50 degrees Fahrenheit. Irrigated lands near Yampa and Steam- <br />boat Springs have an average annual growing season of 102 days. Areas near <br />Craig average 125 days. <br /> <br />Average annual precipitation varies from more than 50 inches along the Con- <br />tinental Divide to less than 9 inches in the desert areas. The amounts are <br />fairly uniform from month to month, with no periods of conspicuously heavier <br /> <br />2 <br />
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