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FLOOD00714
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Last modified
11/23/2009 1:37:42 PM
Creation date
10/4/2006 9:26:18 PM
Metadata
Fields
Template:
Floodplain Documents
County
Montrose
Community
Montrose
Title
FIS - Montrose
Date
7/17/1986
Prepared For
Montrose
Prepared By
FEMA
Floodplain - Doc Type
Current FEMA Regulatory Floodplain Information
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<br />Creek and Montrose Arroyo basins. However, no historical records <br />of flooding are available for any separate stream. <br /> <br />2.4 Flood Protection Measures <br /> <br />As of June 1980, no flood-control projects affecting floodflows or <br />flood elevations were in existence. However, the Dallas Creek <br />project, located at Ridgeway, Colorado, creates a reservoir that <br />has 80,000 acre-feet of storage, with an additional flood-control <br />storage for spring runoff of 26,000 acre-feet. A 1973 U.S. Army <br />Corps of Engineers report states that this project will reduce the <br />standard project flood of 7,000 cfs to a flow of 3,700 cfs at the <br />dam site. Although this could provide incidental flood-control <br />benefits to downstream flood plain areas, flood control is not a <br />function of this project; therefore, any effects of the Dallas <br />Creek project were not included in this study (Reference 6). <br /> <br />Improvements, such as dikes and bank protection, have been made at <br />various locations along the Uncompahgre River. Some incidental <br />flood protection is provided by several irrigation canals that <br />branch off from the river at different locations upstream of the <br />study area. These canals are part of the Uncompahgre Project, <br />which was completed in 1931. This project included many diversion <br />dams and canals, as well as the Gunnison Tunnel and the Taylor <br />Park Dam (Reference 7). During periods of flooding, these struc- <br />tures provide only incidental flood storage and protection. <br /> <br />Concurrent with periods of snowmelt runoff, maximum allowable flow <br />(all gates open) is usually in effect for the irrigation canals to <br />meet the requirements of agricultural areas. During periods of <br />excessively high flows on the Uncompahgre River, transbasin diver- <br />sions from the Gunnison River to the Uncompahgre Valley are reduced <br />to alleviate flood conditions. <br /> <br />On the smaller streams, only incidental flood protection is provided <br />by numerous irrigation reservoirs throughout the study basins. <br /> <br />Montrose Reservoir (Cerro Summit Reservoir) is located at the <br />extreme end of Cedar Creek, at Cerro Summit. <br /> <br />There is a small on-stream irrigation reservoir located approxi- <br />mately 1,200 feet downstream of the Ogden Road crossing of Montrose <br />Arroyo, outside the corporate limits. The capacity of this reSer- <br />voir is estimated to be 2.5 acre-feet. <br /> <br />There are other small reservoirs scattered through the basins, <br />primarily for stock watering. The size, location, and condition <br />of these reservoirs indicate their minimal effect on basin hydrau- <br />lics. <br /> <br />8 <br />
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