7798

• UCREFRP Catalog Number: 7798
• Author: Richardson, S.
• Title: Conceptual Management Plan for Razorback Sucker Habitat Enhancement in Flooded Bottomlands, Escalante Ranch, Jensen, Utah.
• USFW Year: 1994.
• USFW - Doc Type: \
• Copyright Material: NO

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Figure 12 shows the number of days each year when flows have
equaled or exceeded 15,000 cfs. This figure gives some idea of
the expected frequency of flooding which could be utilized for
development at this site. Prior to 1963, flows that could have
produced flooding conditions for at least 10 days could have
occurred every 1.6 years, with many periods experiencing
consecutive flood years. However, since 1963, the interval
between flood producing flows has increased to 2.4 years.

GREEN RIVER A T JENSEN
DAYS OVER 15.000 CFS

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19.7

1952

1957

'9&2

19&7

1971

1977

:982

1987

1992

W A TEK YEAR

Figure 12. Number of Days per Water Year with Flows Equal to
or Exceeding 15,000 cfs (From Cooper and Severn 1994b)

The modification of high flows resulting from the construction of
Flaming Gorge Dam is significant for two reasons. First, high
flows in excess of 15,000 cfs range are needed to modify the
river channel and create off-channel habitats and create
favorable reproductive conditions for native riparian species,
such as cottonwoods and willows (Cooper and Severn 1994Q).
Second, high flows allow larval razorback suckers to enter

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