7036

• UCREFRP Catalog Number: 7036
• Author: Holden, P. B. and C. B. Stalnaker
• Title: Distribution of Fishes in the Dolores and Yampa River Systems of the Upper Colorado Basin
• USFW Year: 1975
• USFW - Doc Type: The Southwestern Naturalist
• Copyright Material: YES

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Dolores river systems and rep~rts on the distribution of fishes with
emphasis on rare and endangded species. Alterations in the form of
reservoirs have been proposed f~r hoth rivers in the near future (U. S.
Dept. Interior 1966; U. S. Bur. o~ Heclamation 19(3).
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STUDY AREAS. Dolores Study ~rea. The Dolores River (Fig. 1) is a clear,
cool stream above Dolores, Colorado \tith a considerahle trout fishery. Immediately
below the town, mast of the wlItl'r is \takell out for irrigation Juring summer. 1'hr,
stream then runs at various low DO\'<js until it joins the San Miguel HiveI' below
Uravan, Coloraoo. The San Miguel is! cool, relatively cleM and at their confluence
has a flow many times greater than tHe Dolores during the irrigation season. Much
of this middle Dolores HiveI' hclow CalJOne, C;)lorado, consists of fairly slow-moving
water having pools interspersed with Jmall rimes. At times parts ofthe river appear
to dry up completely. Below the mouth of the San Miguel, the stream is character',
ized by long pools amI short rapids. TI\e river can-iI'S a very high salt load below its
middle stretch,

Fig. 1.

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