7425

• UCREFRP Catalog Number: 7425
• Author: Vandas, S. e. a.
• Title: Dolores River Instream Flow Assessment
• USFW Year: 1990.
• USFW - Doc Type: Project Report.
• Copyright Material: NO

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Transect located near Bradfield Bridge, Dolores River .................................................................. 36

Dolores River transect located below Big Gyp confluence .............................................................36

Petroglyph discovered on canyon rocks adjacent to Dolores River ................................................ 39

Departing campsite in lower reach of the Dolores River ................................................................40

Camping on sand bar located downstream of Coyote Creek Confluence

with the Dolores River .....................................................................................................................42

Trout makes up part of Dolores River Fishery ................................................................................43

Floatability concerns at Snaggletooth Rapids during periods of low flow
3 .
(approximately 20 ft Is) ..................................................................................................................63

Whitewater rafting at an approximate flow at 2,000 ft3/s
in upper reach of Dolores River ...................................................................................................... 63

Flow evaluation curves for the upper canyon ..................................................................................64

Flow evaluation curves for the lower canyon ..................................................................................64

Canoeing on lower Dolores River rapids at approximately 250 ft3/s .............................................65

Low Dolores River flows (17 ft3/s) depicting loss of potential aquatic habitat..............................72

Dolores River upstream from Disappointment Creek confluence .................................................. 74

Confluence with Disappointment Creek depicting sediment loading ............................................. 75

Dolores River downstream of Disappointment Creek confluence ..................................................76

Sand bar establishment in lower reach of Dolores River ................................................................ 79

Scenic boating opportunities include open-hull canoe floating ....................................................... 83

Annual hydrograph for scenario "A" channel maintenance/fishery,

Dolores River, Colorado .... ............ ....................................................... ................. ................. ......... 84

Annual hydrograph for scenario "B" fishery, Dolores River, Colorado .........................................84

Annual hydro graph for scenario "C" whitewater recreation/channel maintenance/fishery,

Dolores River, Colorado ........... ............... ................. ................ ............ .................... ......... ..... ......... 85

Annual hydrograph for scenario "D" scenic recreation/fishery,

Dolores River, Colorado .................................................... ........................ ..... ............ .............. ....... 85A
Annual hydrograph for scenario "E" combination recreation/fishery,

Dolores River, Colorado .... ............... ...................................... ............ .......... ....... ............ ................86