7403

• UCREFRP Catalog Number: 7403
• Author: Valdez, R. A. and W. J. Masslich.
• Title: Interim Report No. 2 - 1990 Humpback Chub Monitoring in Cataract Canyon.
• USFW Year: 1990.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

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RIVER FLOWS

Flows of the river are provided for this trip to provide a perspective of conditions encountered
during sampling (Table 6). The figures are provided by the Colorado Basin River Forecast Center of
the National Weather SeIVice (NOAA) in Salt Lake City, Utah. Flows for the Colorado River above
the contluence are estimated from the stream gauge located at Cisco. (RM 95.2). Flows for the Green
Riverabov~.~contluence are estimated from the stream gauge located at Green . River (RM 119.9).
Flowsin~taract Canyon are estimated from the combination of these two stream gauges since there
IlI'e rio significant inflows between these gauges and Lake Powell Allflows are recorded at 5:00 am.

ESTIMATED RIVER FLOW (CFS)
Cisco Green River Cataract
1 June 26 5,500 5,100 9,800
27 4,800 5,000 9,800
28 4,500 4,400 9,300
29 4,300 4,200 8,800
30 4,000 4,700 8,300
July 1 3,800 4,100 8,200
2 3,600 4,300 7,700
TRIP DATES ESTIMATED RIVER FLOW (CFS)
Cisco Green River Cataract
2 September 27 2,750 1,600 4,500
28 2,650 1,600 4,400
29 3,200 1,500 4,350
30 2,950 1,875 4,400
1 3,000 1,700 4,775
2 2,900 1,650 4,650
3 4,750. 4,650 4,450
4 4,250. 1,500 5,450
· Heavy rains caused sudden increase in Cisco gage.

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