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Last modified
7/14/2009 5:02:35 PM
Creation date
5/20/2009 2:56:07 PM
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UCREFRP
UCREFRP Catalog Number
9417
Author
U.S. Department of the Interior.
Title
Final Environmental Assessment
USFW Year
1998.
USFW - Doc Type
Acquisition and Enhancement of Floodplain Habitats along the Upper Colorado, Green, and Gunnison Rivers as part of the Recovery Program for Endangered Colorado River Fishes.
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<br />4. Ti meliness - This criterion refers to the <br />amount of time required for acquiring and <br />restoring sufficient amounts of quality habitat to <br />support and sustain endangered fish recovery. <br />Declines in endangered fish populations are <br />expected to continue until the ecosystem has <br />been repaired to the degree necessary to turn <br />things around, so time is of the essence. If <br />ecosystem repair takes too long, the species may <br />become extinct. <br /> <br />5. Permanent Rights - Habitat of sufficient <br />quality and quantity will be necessary to support <br />and sustain recovery in perpetuity. Temporary <br />agreements or short-term leases may assist in <br />achieving recovery but, if the habitat is <br />subsequently removed from the system after the <br />lease expires, then recovery may no longer be <br />sustainable. Therefore, permanent rights are <br />needed to maintain and protect habitats over the <br />long term. <br /> <br />C. Alternatives Considered <br /> <br />To provide and protect floodplain habitat to <br />assist in recovery of the endangered fishes, three <br />alternatives were identified and considered by the <br />interdisciplinary team charged with preparing this <br />environmental assessment. A description of each <br />of the three alternatives follows: <br /> <br />1. The No Action Alternative <br /> <br />The No Action Alternative is the foreseeable <br />future without the project. This alternative <br />suggests a continuation of the status quo. <br />Habitat quality and quantity, which is already not <br />sufficient to achieve or sustain recovery, can be <br />expected to continue to degrade as water <br />development and floodplain development <br />continue. The ecosystem food supply will <br />continue to diminish, affecting all species, <br />including the endangered fishes. Razorback <br />sucker recruitment can be expected to decrease, <br />likely resulting in ultimate extinction for that <br /> <br />II - 2 <br /> <br />species, The bony tail may be declared <br />unrecoverable if it is determined that the loss of <br />food supplied by the floodplain is a major <br />limiting factor. <br /> <br />m <br />g <br />m <br />a <br />a <br />I <br />u <br />g <br />D <br />II <br />g <br />U <br />D <br />I <br />I <br />I <br />U <br />g <br />II <br /> <br />2. Induce Flooding <br /> <br />To provide habitat for endangered fishes, <br />floodplain areas could be inundated by acquiring <br />and releasing large amounts of water from <br />reseIVoirs during spring runoff. This alternative <br />may restore enough habitat needed for recovery, <br />even if nothing is done to reconnect the 70 miles <br />of bottomland habitat that has been disconnected <br />from the river via flood control levees within the <br />high-priority geographic areas of the Upper <br />Basin (Figures 1-3 and 1-5). However, induced <br />flooding would inundate properties of private <br />landowners without their permission, no doubt <br />resulting in undue hardships. Also, the costs <br />associated with acquiring the amount of water <br />necessary to induce flooding, with litigation, and <br />with paying for flood damages would be <br />extraordinarily high. <br /> <br />3. Protect and Enhance Flooded <br />Bottomlands to Take Advantage <br />of Available Flows <br /> <br />Alternative #3 would entail entering into <br />agreements with and/or acquiring rights from <br />willing landowners to protect and enhance <br />floodplain habitat to benefit the endangered <br />fishes. A variety of tools could be used to <br />accomplish habitat protection, including the <br />development of agreements, partnerships, <br />acquisition of easements, donations, and <br />exchanges. Floodability enhancements could be <br />accomplished, where warranted, via excavation, <br />which may include breaching dikes and levees. <br />All acquisitions, agreements, and habitat <br />enhancements would be done with willing sellers <br />and willing participants. Under this alternative, <br />there would be no condemnation, no acquisition <br />of water rights, and no requests for flood flows. <br />
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