9568

• UCREFRP Catalog Number: 9568
• Author: Resource Consultants Inc.
• Title: Sediment Transport Studies of the Little Snake, Yampa, and Green River Systems.
• USFW Year: 1991.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

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Dee~lodge Gage = 1.145 * (Li Iy + Maybe! I)

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R-squa~e = .98

Std. E~~o~ Re9~ession (log units) .002?

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Sum of Li Iy & Maybe I I Gages (cfs)

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FlgUfe 4.2 Correlation of Deerlodge Park data with the sum of Mayben and Lily data.

4.4 AnalYSis of Flow Records

4.4.1 Monthly Flow Summaries and Flow Duration. Daily flow values for the period of
continuous record were retrieved from the Geological Survey's WATSTOR data base. Monthly flow
summaries for the stations were determined by a FISh and Wildlife Service program and checked against
published Geological Survey records. Flow durations were computed using either the Geological Survey's
WATSTOR system, or a program written by the Bureau of Reclamation. Detailed results of these
calculations are presented in Appendix B.

Mean streamflow at the Mayben gage is approximately 1580 cfs based on the period of continuous
record, water years 1917 through 1988. The driest year on record was 1977 (mean of 477 cfs) and the
wettest year was 1984 (mean of 3025 cfs).

Mean streamflow at the Lily gage is approximately 590 cfs for the period of continuous record,
water years 1922 through 1988. The driest year on record was 19TI (mean of 143 cfs) and the wettest year
was 1984 (mean of 1252 cfs).

Mean streamflow at the Deerlodge gage for the synthetic period of record (sum of Lily and
Mayben gages for WY 1922 - 1988) is approximately 2131 cfs. The driest year was 19TI (estimated mean of
619 cfs) and the wettest year was 1984 (mean of 4287 cfs at gage).

Mean annual runoff in the Green River has not been affected by Flaming Gorge operation, but the
duration of relatively large discharges that transport most of the sediment load have decreased significantly
(Andrews, 1986). Figure 4.3 shows the flow duration curves for the pre and post reservoir periods.

4-4

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