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WSP10148
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Last modified
1/26/2010 2:57:30 PM
Creation date
10/12/2006 4:09:44 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.776
Description
Uncompahgre River General
State
CO
Basin
Gunnison
Water Division
4
Date
7/1/1943
Author
John R Erickson
Title
Consumptive Use of Irrigation Water in Lower Uncompahgre Valley
Water Supply Pro - Doc Type
Report/Study
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<br />lo ~ . . :.:. , <br /> <br />I)D~!21 <br /> <br />-5- <br /> <br />The change in aVerage gradient between the first two seotions <br />is noticeably ahrupt, and occurs at Ouray. Although the average from <br />Ouray to Colona is shown in Table 2 as 62 teet per mile the gradient is <br />considerably steeper !'rom Ouray to RidgWl-Y than it is from Ridgway to <br />Colona, that of the latter seotion more nearly approximating the gradient <br />of the Colona-Montrose seotion. From Colona to Delta the change is grad- <br />ual, conforming to the indioated gradients. <br /> <br />5. General Geology. <br /> <br />No attempt is made here to give more than a general desoription <br />of the basin geology, with reference only to the general structure and <br />stratigraphy. Discussion of historioa.l geology, economic geology of the <br />Ouray region and the canplex structure of the upper basin is not necessary <br />in this rel'ort. For a detailed report on the geology of the basin (Ouray <br />Quadrangle) see the U. S. Geologioal Survey, Geologio Atlas (24). <br /> <br />In the mountain area of the upper basin the only Pre-Cambrian <br />material present is known as the Uncompahgre Formation. .This is a massive <br />white or gray quartzite, looally conglomeritic with dark slate bands. <br />Overlying the Unoompahgre Formati on are the sandstone.s, limestones and <br />shales of the Devonion, Carboniferous, Triassio and Jurassio periods. This <br />entire Pre-Tertiary surfaoe was oompletely buried to great depth by vol- <br />canic action. This deposit known as the San Juan Fonnation was me:ile up <br />by volcanic flows and tuff 0 l' quartz, latite and rhyolite, and by bedded <br />tuff, breooia, and agglOllJ3rate of andesi tio material. Out of this vol- <br />canic covered maSs has been eroded the present San Juan Mountains. <br /> <br />Along the river below Ouray the over-lying materials have been <br />eroded away exposing the carboniferous deposits. In the oani'on walls can <br />be seen the Jurassic sandstones and shales (MoElmo Formation) whioh dip <br />under an over-lying mantle of Manoos Shale a short distance above Ridgwa.y. <br />The Jurassio formations and the Haucos Shale are separated by a thin <br />strata of Dakota sandstone. A series of faults north of Ridgway bring <br />these formations to the surfaoe again. However, they continue to dip to <br />the north running dom under the main valley, being well covered in that <br />area by the l1ancos Shale. <br /> <br />The broad valley area betv.een Colona and Delta lies in a shallow <br />synoline bounded by the Unoompahgre uplift on the west and the Vernal and <br />Blaok Mesa uplifts on the east. The western esoarpment of these uplifts <br />are formed by sharp monoclinical flexures of the formations and by faults. <br />Vernal Hesa and Black Mesa on the east are made up of Pre-Cambrian sohists <br />and granite, oapped by thin eastward dipping layers of sedimentary rocks. <br />On the v.est the Da~-ota sandstone which lies under the valley is upturned <br />to the surfaoe of the Uncompahgre Plateau and is underlain by the cross- <br />bedded sandstones, shales and limestones of the upper Jurassic as evi- <br />denoed in the deeply eroded canyons of the Plateau. <br />
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