WSP08458

• File Number: 8282.751
• Description: Colorado River Operations
• Basin: Colorado Mainstem
• Date: 1/1/2002
• Author: USDOI/BOR
• Title: Draft Environmental Impact Statement Vol 1 Implementation Agreement, Inadvertent Overrun and Payback Policy and Related Federal Actions
• Water Supply Pro - Doc Type: Publication

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Table ES-l. Summary of Potential Impacts of the Execution of the lA, Adoption of the lOP, and Implementation of Biological
.;;: Conservation Measures (Page 6 uf 29)
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ResoJ/rce/Isslle No At'tio1l Impacts of Proposed Adion/Altanntivt!s
BIOLOGICAL RESOURCES- VEGETATION
Biological ConselVation Measures
Potential impact to native and non.native No change to vegetation would occur. Construction may disrupt native and non-native
vegetation from restoration or crealion of 44 vegetation, but this disruption would be temporary
acres of backwaters along the Colorado River and it is anticipated that additional, beHer guality
between Parker D:lffi and \mperial Dam. vegetation would be established once restoration is
completed (beneficial impacl). It is likely thai areas
where vegetation is removed would contain
primarily introduced speCIes, and native vegetation
would be removed only on an incidental basis.
PotentiLtI impact 10 native and non-native No change to vegetation would occur. Construction may disrupt nativt' and non.native
vegetation from restoration or creation of up to vegetation, but this disruption would be temporary
1,116 acres of southwestern willow flycatcher and it is anticipated that additional, beller quality
habital along the Colorado River. vegetation would be established once restoration is
completed (beneficial impact). It is likely thai areas
where vegetation is removed would contain
primarily introduced species, and native vegetation
would be removed only on an Incidental basis.
BIOLOGICAL RESOURCES-FISH AND WILDLIFE
Implementation Agreement
Colorado River. Potential impact to fish and No change to fish and wildlife would occur. Drop in groundwater may redul'e wetland tlnd
wildlife from decreased water levels (and riparian habitat along the Colorado River, which is
associated drop in groundwater level) of the used by amphibians, reptiles, riparian and marsh
Colorado River between Parker Dam and obligate birds, and mammals. Full mitigation of
Imperial Dam and. associated loss of vegelation these impacts would be accomplished through
habitat. implementation of the biological conservation
measures.

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