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FLOOD00232
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Last modified
11/23/2009 1:22:00 PM
Creation date
10/4/2006 9:09:43 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
318
County
Weld
Community
Unincorporated Weld County
Title
Flood Insurance Study - Weld County, Colorado, Unincorporated Areas and Eaton, Colorado
Date
9/1/1991
Designation Date
11/1/1991
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />La Poudre River floodplain are also of the Fluvaquents-Fluvents <br />association (Reference 3). <br /> <br />Sheep Draw flows in a northeasterly direction to its confluence <br />wi th the Cache La Poudre River. The length of the study reach is <br />approximately 5.2 miles. Topography 1n the basin consists of <br />gently rolling hills, with basin slopes varying from 1 to 3 <br />percent. The primary land use in the basin is for irrigated <br />croplands and pastures. The major soil types in the basin are of <br />the Ascalon-Olney-Vona, Weld-Andena-Colby, and Fluvaquents-Fluvents <br />associations (Reference 3). <br /> <br />'. <br /> <br />The Ashcroft Draw study reach, approximately 3.2 miles long, flows <br />southeast to its confluence with the South Platte River, <br />approximately 3 miles southwest of the City of Greeley. Basin <br />slopes range from 8l'l'roximately 3 percent in the lower reaches to <br />over 8 percent near the headwaters. Most of the basin is utilized <br />as irrigated cropland, with a small portion devoted to rangeland <br />and urbanized areas. The major soil tYl'es in the Ashcroft Draw <br />basin are of the Ascalon-Olney-Vona association (Reference 3). <br /> <br />The Eaton Draw study is comprised of two areas, one near the <br />confluence of the Cache La Poudre River 0.61 miles long) and one <br />near the Town of Eaton (2.08 miles long). In February 1978, the <br />Town of Eaton annexed a part of Weld County along Eaton Draw <br />containing floodplains. Eaton Draw flows south in a long, narrow <br />basin between the Town of Nunn and the City of Greeley. The basin <br />width varies from I to 3 miles, and the basin slopes vary from 2 to <br />5 percent. Most of the basin is used as irrigated cropland and <br />pasture. Natural grasses and sage brush form most of the ground <br />cover. The major soil tYl'es in the basin are of the Nunn-Dacono- <br />Altvan, Ascalon-Platner-Stoneham, Renohill-Shingle, Weld-Adena- <br />Colby, and Kim-Otero associations (Reference 3). <br /> <br />~ <br /> <br />The Tri-Area Drainageway (Frederick-Firestone-Dacono drainage <br />basin) flows north through the Town of Dacano, Frederick, and <br />Firestone to its confluence with the St. Vrain River. The portions <br />of the drainageway outside of the towns' corporate limits are <br />included in the study. Basin slopes range from 1 to 2 percent and <br />channel slopes vary from 0.4 to 1.0 percent. Land use in the basin <br />is approximately 90 percent agricultural and 10 percent urban. The <br />spoil types are of the Weld-Adena-Colby, Platner-Ulm-Renohill, and <br />Ascalon-Olney-Vona associations (Reference 3). <br /> <br />" <br /> <br />The Big Thompson River study reach is approximately 12.4 miles <br />long. The river flows in a general easterly direction to its <br />confluence with the South Platte River about 5 miles southwest of <br />Greeley. The 100-year floodplain width varies from a minimum near <br />350 feet to a maximum near 3,500 feet with an average of 1,750 <br />feet. The streambed has an average slope of 8 feet per mile <br />through the study reach. The channel is alluvial and meanders <br />through a u-shaped valley. The major portion of the floodplain in <br />the study reach is in agricultural use. Few buildings of any type <br /> <br /> <br />5 <br />
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