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Last modified
7/14/2009 5:02:32 PM
Creation date
6/1/2009 12:39:22 PM
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UCREFRP
UCREFRP Catalog Number
8018
Author
Irving, D. B. and B. D. Burdick.
Title
Reconnaissance Inventory and Prioritization of Existing and Potential Bottomlands in the Upper Colorado River Basin 1993-1994.
USFW Year
1995.
USFW - Doc Type
\
Copyright Material
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11th-five sites each; rank 10th-four sites). Along the Colorado River, there <br />were 10 bottomland habitat sites within the Debeque area (rm 202.3-221.7 [rkm <br />326-357]), eight sites within the 15-mile reach (rm 173.9-184.2 [rkm 280- <br />297]), and five sites within the 18-mile reach (rm 161.0-169.6 [259 <br />273])(Table 3). There were three sites within the Delta area along the <br />Gunnison River (rm 50.2-54.2 [rkm 81-87]). <br />The top ranked site was the Walter Walker State Wildlife Area in the 18- <br />mile reach. Four other sites in the immediate vicinity ranked 6th and 10th. <br />Johnson Boy's Slough along the Gunnison River ranked 2nd, the Clifton Pond <br />area along the Colorado River ranked 3rd, and the Debeque I-70 Slough ranked <br />4th. Six other sites immediately downstream of the Debeque I-70 Slough ranked <br />9th and 11th. <br />Ecology <br />The wetland studies of the five initial bottomland sites conducted by <br />Cooper and Severn (Table 4) were completed in 1993. Each site was unique and <br />had varying levels of restoration potential. The bottomland habitat areas in <br />Ouray National Wildlife Refuge, the Escalante State Wildlife Area, and the 29- <br />5/8 Road gravel-pit pond have the greatest potential for razorback sucker <br />restoration. The Escalante Ranch area and Moab Slough may require significant <br />modification for restoration. <br />Hydrology <br />Green River Drainage <br />Stage vs. Discharge Relationship. Staff gauges were installed at seven <br />different bottomland sites from mid-May (5/11) through late-June (6/28) and <br />monitored for 34 to 48 days to obtain stage-discharge data during the high- <br />flow period (Figures 8-14). Spring runoff in the Green, Yampa, and White <br />rivers was moderately low in 1994 compared to moderately high flows in these <br />rivers in 1993. <br />The maximum daily mean discharge in 1994 was 11,068 cfs on 20 May for <br />the Green River at the Jensen stream gauge, 5,650 cfs on 18 May for the Yampa <br />River at the Maybell gauge, and 2,529 cfs on 23 May for the White River at the <br />Watson gauge. In 1993, the maximum daily mean discharge was 20,000 cfs for <br />the Green River, 17,870 cfs for the Yampa River, and 4,570 cfs for the White <br />River. <br />Stage-discharge data recorded at temporary staff-gauge sites were <br />collected over a narrow range and at a lower magnitude of flows in 1994 <br />compared to.previous higher water years (Table 5). Flows in 1994 were lower <br />than anticipated making it difficult to develop a reliable stage vs. discharge <br />relationship. <br />The linear regression correlation coefficients (r2) of the stage vs. <br />discharge relationships were high (range of 0.83 to 0.97) at six of the seven <br />25
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