WSP06180

• File Number: 8271.200
• Description: Colorado River Basin Salinity Control Program - Development and History - UCRB 13a Assessment
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 5/1/1979
• Author: US Fish and Wildlife
• Title: A Report on Use of A Regional Reconnaissance Methodology to Determine Instream Flow Effects As Applied to the Analysis of Impacts of Coal and Oil Shale --- part 2 of 2 - Attachment A through end
• Water Supply Pro - Doc Type: Report/Study

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streams in Group I, Class (a), subclass 50-150 cfs average
annual flow, which includes reaches of other Colorado streams
in vicinity of following USGS gages:

Station

Piney Creek near State Bridge
EF San Juan River ne8r Pagosa
Springs
Frying Pan River at Norrie
Navajo River above Chroma
EF Williams Fork above Willow
Creek*
Tomichi Creek at Sargents
Slater Fork near Slater
Hermosa Creek near Hermosa
Williams Fork near Parshall
Yampa River near Oak Creek
Totals
Averages

Watershed
Area (sQ.mi.)
86.2
86.9
90_6
96.4
108.0
149.0
161. 0
172.0
184_0
227_0
1.361.1
136.1

Average
Annual Flow (cfs)

73.4

119.0
123.0
116.0

107.0
62.4
71.6
137.0
140.0
84.0
1,033.4
103.3

2. Retain Elk River at Clark (the reach of Elk River from Clark
to Yampa River). This reach can serve as the prototype for
simulating a reach representative of streams in the vicinity
of the follow1ng gages in Group I, Classes (a), (b), and (c),
Subclasses 275-375 cfs:

! I Watershed Average
,
Station Area (5Q.mi.) Annual Flow (.Efll
Class (a)
, I Elk River at Clark. 206 338
. I NF White River near Buford 223 289
Class (b)
NF Whfte River at Buford 254 309
Los Pfnos River near Bayfield 270 348
East River at Almont 289 342
San Juan River at Pagosa
Springs 298 369
Piedra River near Piedra 371 314
Taylor River at Almont 477 340
Class (c)
Blue River above Green
Mountain Reservoir 511 302
Piedra River near Arboles 629 328
Totals 3,528 3,2'f9
Averages 353 328
I- 3. Drop NF White River in view of above.
I 2
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