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Last modified
1/26/2010 10:09:28 AM
Creation date
10/5/2006 4:24:57 AM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
330
County
Mesa
Community
Unincorporated Mesa County
Basin
Colorado Mainstem
Title
Flood Insurance Study - Mesa County, Colorado, Unincorporated Areas
Date
7/1/1992
Designation Date
9/1/1992
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />early fall general rain over large areas, normally make August, <br />September, and October the wettest months of the year. Most <br />wintertime precipitation occurs as snow and, in the higher <br />elevations, a deep snowpack normally accunulates. Average snowfall <br />ranges from approximately 19 inches at Fruita and Palisade to <br />approximately 72 inches at Collbran. Snowfall is generally <br />dominated by a few large storms. Snowpack ordinarily begins in <br />late October and snowmelt in late April; snowmelt continues through <br />early July. <br /> <br />, <br /> <br />The average monthly temperature at Grand Junction ranges from <br />approximately 260F in January to approximately 78.30F in July. <br />Grand Valley temperature extremes are evidenced by mean maximums <br />ranging from approximately 380F in January to approximately 940F in <br />July, and by mean minimums ranging from approximately 150F in <br />January to 620F in July. Cooler temperatures prevail in higher <br />mountain areas. The lowest recorded temperature in the county was <br />-360F at Collbran on February 8, 1933. In Grand Valley, record low' <br />and high temperatures are -340F and 640F for January and 380F and <br />1l1oF for July, respectively. The growing season usually extends <br />for approximately 190 days. <br /> <br />~ <br /> <br />Mesa County is principally mountainous, and native vegetation is <br />mainly in the pinion-juniper and forest categories, with some salt <br />desert shrub land in the west-central portion of the county and <br />grass-covered valley land in the western portion. Agricultural <br />operations and urbanization have taken place along several streams <br />in the county, but have been concentrated principally in the Grand <br />Valley region. Valley areas not changed by human encroachment <br />retain desert shrubs, cottonwood trees, willow trees, and an <br />understory of hardy grasses. Between elevations of 5,000 and 8,000 <br />feet, pinon pine, juniper, oak, big sagebrush, and Douglas fir <br />trees are prominent. From an elevation of 8,000 feet to the <br />timberline, vegetation consists mainly of subalpine fir, aspen, <br />Englemen spruce, and lodgepole pine trees. Hardy grasses, sedges, <br />and alpine willow trees are found above timberline. <br /> <br />2.3 Principal Flood Problems <br /> <br />. <br /> <br />. <br /> <br />Flooding in Mesa County 1S caused mainly by snowmelt in the larger <br />drainage basins and by cloudbursts over the smaller drainage <br />basins. However, general rainstorms constitute the principal flood <br />hazard on Roan Creek, whi 1e general rain on snowpack creates the <br />most hazardous conditions in the basins of Plateau and Buzzard <br />Creek. The Dolores River experiences flooding from both snowmelt <br />and general rainstorms. Major floods on the Colorado and Gunnison <br />Rivers result from rapid melting of the mountain snowpack during <br />May, June, and July. Major floods on the other creeks, washes, and <br />small streams in the study area, especially those with much of <br />their drainage basin below an elevation of 8,000 feet, are most <br />often caused by cloudburst storms. <br /> <br />11 <br />
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