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FLOOD04730
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Last modified
1/25/2010 6:47:05 PM
Creation date
10/5/2006 12:55:37 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
307
County
Rio Blanco
Community
Rangely
Basin
Yampa/White
Title
Flood Insurance Study - Rangely
Date
9/1/1990
Designation Date
9/1/1990
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />In general, the drainage pattern of Rangely is from southeast to <br />northwest. The White River flows westward on a meandering course <br />just north of Rangely. The drainage basin of College Canyon Draw, <br />also known as Dragon Wash, is south of the town. The stream enters <br />the town along its southern corporate limits, flowing west and <br />northwest to join the White River. The drainage basin of Coal Mine <br />Draw is also south of town and is situated directly to the west of <br />the College Canyon Draw drainage basin. The stream enters the town <br />in the western half of its southern corporate limits, then flows <br />west and northwest to its confluence with the White River. <br /> <br />Rangely rests on a bedrock formation of Mancos Shale of the Upper <br />Cretaceous age. This layer is more than 5,000 feet thick, and is <br />essentially a dark grey, calcareous, marine depos i t that weathers <br />light grey to yellow brown. Selenite gypsum is common throughout <br />the formation. The soils of this area have formed under a low- <br />effective annual precipitation. Soil-parent materials are mainly <br />calcareous, clayish shales and sandstones; however, sandy and <br />gravelly outwash, windblown sands and silts, and alluvial sediments <br />are also extensive. Surface soils are light colored and range in <br />texture from sandy loam to silty clay. Subsoils are principally <br />clay loam or clay in texture, and have a permeability rate that <br />varies from moderate to slow. Sandy subsoils with a high <br />permeability rate are a minor component within the area. <br /> <br />Tourism is of little significance to the town, even though Dinosaur <br />National Park is only 30 miles to the north. Available lodging in <br />Rangely is limited to that required for oilfield workers. However, <br />the town is growing. Based on 1970 and 1980 Bureau of Census <br />population figures of 1,591 and 2,113, respectively, Rangely <br />experienced a 33-percent population growth in 10 years. Today, <br />Rangely has a population of approximately 2,530, according to a <br />survey conducted by the Town of Rangely Department of Communi ty <br />Development (Reference 2). <br /> <br />Oil has been the lifeblood of the town, but cattle and sheep <br />ranching is also considered important to the economy of this rural <br />community. The town is looking forward to further coal and oil <br />development. Other natural resources in the Rangely area include <br />rare earths, copper, silver, gold, thorium, aluminum, low-grade <br />uranium, and high-grade oil shale (estimated to contain more than <br />1.5 trillion barrels of oil). Oil shale development holds many <br />possibilities for social and economic growth. Although large scale <br />plans for oil shale development have already been made, <br />implementation has presently been suspended until economic <br />conditions change. <br /> <br />Topography in the Rangely area is extremely diverse, and includes <br />dissected plateaus, sharp ridges, abrupt cliffs, and rugged <br />badlands that are interspersed with open valleys, meadows, and <br />basins. The presence of underlying rock layers with wide <br />differences in resistance to erosion has been the principal factor <br />in the evolution of these varied landforms. Erosion in the rolling <br />shale hills and badlands around Rangely 1S severe. Deep and <br /> <br />4 <br />
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