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WSP08731
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Last modified
1/26/2010 2:49:25 PM
Creation date
10/12/2006 3:14:14 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8220.105
Description
Colorado River-Water Projects-Navajo
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
4/1/2000
Author
BOR
Title
Re-Operation of Navajo Dam-Recreation Rehabilitation Navajo Project Colorado New Mexico-Summary and Finding of No Significant Impact
Water Supply Pro - Doc Type
Report/Study
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<br />Environmental Impacts <br /> <br />Impacts to affected TeSOlJrr.~.~ ~re discllssed ir:. Ch~pter 3 afth.;; rA. A l.nit:[summary of the <br />impacts associated with the selected action are listed here. <br /> <br />General <br />. Approximately 6.5% (60 acres of 925) of the project area's land base above the reservoir <br />high water line would be subject to long-term facility placement. <br />. Most recreation facility development would occur in previously disturbed areas. <br />. A large increase (up to 59%) in visitors is expected within one year following <br />rehabilitation; then visitors would probably continue to increase at about 5% a year until <br />carrying capacity or other factors cause a leveling off or decline. <br />. Degree of visitor impacts would be directly proportional to visitation, but may be offset <br />somewhat by implementing and enforcing management actions. <br /> <br />Soil <br />. The relatively small amount of recreation related soil erosion would be offset through use <br />of best management practices, implementation and enforcement of management actions <br />to protect soils, and revegetation of recreation related disturbance. <br /> <br />Vegetation <br />The relatively small amount of vegetation damaged by recreation related activities would <br />be offset through implementation and enforcement of management actions to delineate <br />use areas and protect vegetation, and through revegetation of recreation related <br />disturbance. <br />. Construction activities within the project area would not impact Knowlton's cactus <br />(federal endangered) or Arboles milkvetch (Colorado State plant of concern), but some <br />Abajo penstemon (Colorado State plant of concern) could be lost. However, such loss of <br />the penstemon would not endanger the survival of the species. <br />. Dispersed recreational use of the reservoir area has a low potential to adversely affect <br />Knowlton's cactus, Arboles milkvetch, and Abajo penstemon or their habitat. <br />. potential losses of these thr~e species or theiI habitat could be offset by implementation <br />and enforcement of management actions to protect known populations and their habitat. <br /> <br />Water Oualitv <br />. Navajo Reservoir water quality within Colorado generally meets the standards for the <br />Recreation Class I and Warm Water Fisheries Class I designations. <br />. Dispersed recreational use of the area is expected to cause increased levels of <br />contaminants, particularly petroleum products and human waste. However, <br />implementation and enforcement of management actions to control or reduce pollutants <br />would help offset the expected increases. <br /> <br />Water Use <br />. Consumptive water use at the Park after rehabilitation would be about 13 acre feet per <br />year; this is about 0.003 % of the current total depletion of the San Juan River. About 8 <br /> <br />001303 <br />
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