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Last modified
7/14/2009 5:02:33 PM
Creation date
5/22/2009 6:56:06 PM
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UCREFRP
UCREFRP Catalog Number
8181
Author
Hamilton, S. J., R. T. Muth, B. Waddell and T. W. May.
Title
Hazard Assessment of Selenium and Other Trace Elements in Wild Larval Razorback Sucker from the Green River, Utah.
USFW Year
1999.
USFW - Doc Type
\
Copyright Material
NO
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Ouray National Wildlife Refuge Sites <br />Johnson - 4 Bottomland -Johnson-4 has a proposed 100' wide cut located where the Johnson-4 <br />bottomland drains (See Exhibit A). A major design consideration is that once the J-4 bottomland floods, flows <br />over 13,000 cfs will overtop the levee at the upstream end of J-4 and flood the more extensive upper Johnson <br />bottomlands. One objective of the bottomland floodplain habitat restoration study is to be able to monitor the <br />flooded area. Therefore, the spoils materia! will be used to build up the levee between J-4 and J-3 and <br />prevent the flooding of the J-3 bottomland for discharges up to 30,000 cfs. To accomplish this, 40 cubic yards <br />of additional fill material would be required in addition to the spoils material. The flooding elevation of 4667 <br />would be set back 100' from the bank. The amount of cut vegetation will not be as great for the Johnson <br />Bottom as it was for the BLM bottomlands. The success of the bottomland floodplain habitat restoration <br />activities will be assessed before modifications to J-4 are employed. Construction activities are not planned <br />any earlier than the fall of 1997. The estimated costs of restoration activities varies from $15,000.00 to <br />$150,000.00 depending on the usage of a drainage structure and/or fish kettle. (Note: The fish kettle costs <br />range from $80,000.00 to $100,000.00) <br />Leota - 7 Bottomland -The Leota-7A pond provides another opportunity to flood shallower pond <br />(compared with the BLM sites) which will act somewhat like a terrace, as defined by the recovery program. <br />The Green River flows right along aman-made levee which separates it from Leota Pond-7A. The Leota-7A <br />pond is not managed as a waterfowl habitat pond by the ONWR personnel. The proposed design is to breach <br />600' of the levee (see Exhibit A). Similar to the Johnson-4 design, adjacent Leota ponds would be inundated <br />if the floodability were enhanced at Leota-7A. Consequently, the adjacent levee would need to be raised. The <br />spoil material will be used to build up the levee along Leota-7 and Leota-9, the adjacent ponds. An additional <br />6480 cubic yards of. fill material will also be necessary to prevent flooding up to 30,000 cfs. Some borrow <br />material may be available in ditches located along the Leota Ponds. The flooding elevation will be set back <br />approximately 50'-70' from the river. The estimated construction costs at Leota vary from $47,000.00 to <br />$186,000.00 depending on the use of a drainage structure and/or fish kettle. <br />Wyasket Bottomland - An enormous bottomland providing up to 2000 acres of floodable area, <br />Wyasket Bottomland provides an opportunity for large scale habitat enhancement. The proposed design is <br />to widen and lower an existing channel which connects the river to Wyasket Bottom (see Exhibit B). The size <br />of the bottomland would, however, make monitoring of the bottomland difficult. The success of the bottomland <br />floodplain habitat restoration activities will be assessed before modifications to Wyasket are enacted. <br />Construction activities are not planned any earlier than the fall of 1997, and are subject to the success of the <br />other restoration activities. Approximately 2500' of the existing channel would need to be modified. Survey <br />data on the proposed location is limited and additional data would need to be gathered prior to any final <br />designs being submitted. <br />Sheppard Bottomland -The Sheppard Bottomlands are another series of bottomlands used mostly <br />for waterfowl habitat on the ONWR. It has been proposed that 100' of the Levee along the river adjacent to <br />S-2 of the Sheppard Bottomland be removed (see Exhibit B). The cut would have to extend back <br />approximately 300' back to the bottomland. Similar to Johnson-4 and Leota-7, the ponds adjacent to S-2 may <br />flood if the adjacent levees are not raised. Alternative 1 includes the levee buildup while Alternative 2 <br />proposes to place the spoils above the high water mark and allow the adjacent ponds to flood at higher <br />discharges above approximately 14,000 cfs. The Sheppard bottoms also have problems with selenium <br />concentrations in the water, which may influence any enhancement activities from being implemented. No <br />work is proposed for Sheppard-2 until the fall of 1997 at the earliest, and modifications are subject to the <br />success of the other restoration activities. <br />• <br />57 <br />
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