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WSP01569
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Last modified
1/26/2010 12:31:41 PM
Creation date
10/11/2006 10:32:17 PM
Metadata
Fields
Template:
Water Supply Protection
File Number
8449.900
Description
Bear Creek
State
CO
Basin
South Platte
Date
2/4/1972
Author
USACOE
Title
Final Environmental Statement for Bear Creek Flood Control Project
Water Supply Pro - Doc Type
EIS
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<br />EV~n with the proposed project there would exist, under certain conditions <br />of runoff, the possibility of residual damages to structures in the floodplain. <br />In addition, this increased urbanization would cause the destruction of the <br />remaining riverine habitat below the damsite. <br /> <br />Besides influencing additional development of the floodplain, the <br />project likely will accelerate residential development in other lands <br />adjacent to the project. Such development would lead to increased runoff <br />onto the Bear Creek floodplain, increased amounts of human wastes requiring <br />disposal, and increased transportation demands placed on the local network <br />of roads. <br /> <br />The chemical quality of Bear Creek Lake waters will be influenced by <br />the land use of the watershed. Urbanization of the areas adjacent to the <br />project could have an adverse effect on the lake water quality unless <br />measures are taken to bypass stonn sever runoff around the lake. Lawn <br />fertilizers, salt used for ice removal, and petroleum products residues <br />could enter the reservoir via stonn sewers. Additional sources of bacterial <br />contamination corne from horse stables or cattle located adjacent to Turkey <br />and Bear Creeks. Sewage from small communities along the creeks could also <br />produce sources of high nutrient inflow during runoff periods. <br /> <br />The frequency of occurrence of runoff conditions sufficient to fill <br />the flood control pool is about 0.4% or, stated another way, conditions <br />which could be expected to occur no more than once in 250 years. There <br />is a very small probability that such an event would occur. However, <br />if such an event did occur it would flood a considerable amount of project <br />acreage. Most of this acreage would not contain permanent structures which <br />could be damaged bV flood waters. Vegetation vould probably not be harmed <br />either because of the relatively short time that it would be submerged. <br /> <br />Some vegetation will be lost to the project. Along Turkey and Bear <br />Creeks there is an averstory of large cottonwoods interspersed with a lesser <br />number of boxelder and willows. This woody vegetation would be removed <br />from approximately 1 1/2 miles of streambanks. The main embankment and <br />the conservation pool would be located in this stretch. The vegetative <br />ground cover has been heavily overgrazed and currently consists of annual <br />weeds and mixed weedy grasses. Flooding of this veedy vegetation is not <br />considered a major loss. <br /> <br />There are several abandoned and caved-in coal mines within the <br />project boundaries. Several.of these are located within the multi-purpose <br />and maximum pool boundaries. If these mines were to be left as is, there <br />vould exist the possibility of contamdnation of the lake water by acids <br /> <br />7 <br />
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