WSP07697

• File Number: 8240.200.10.B
• Description: UCRBRIP - Riverine Fish Flow Investigations
• Basin: Colorado Mainstem
• Date: 7/1/2001
• Author: CDOW
• Title: Riverine Fish Flow Investigations 2001
• Water Supply Pro - Doc Type: Publication

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incredible 2,238/km, bluehead at a modest 552/km and roundtail chub at a very low 2/km.

The channel catfish density estimate is inordinately high at 3,668 fish/km.

Table 7. Yampa River population estimates with 95% C.I. (recaptures), and density
estimates (No./I000m), 2000. Mean stream with is about 53 mat 125 cfs, (Stewart 2000).

Lily Park Sevens Duf(y Reach
No./km :l:c.I. NO./km :l:C.I. No./km :l:c.I.
(recaps) (recaps) (recaps)
Total fish 6279 :1:10% (324) 778:1:17% (92) 316 :1:10%(250)
Bluehead Sucker 552:1:36% (25) 309:1:56%(10) 16 :1:103%(3)
Flannelmouth S 2238:1:12% (205) 296:1020%(59) 11 :1:33%(15)
Roundtail Chub 2:1:NR(0) 54 :1:126%(2) 5 :1:23%(16)
Colo. Pikeminnow 5:1oNR(0) 3 :IoNR(O) 4 :IoNR(O)
White Sucker & Crosses 14:10170% (I) 106+38%(15) 203 :1010%(197)
Smanmouth Bass 121:1:188% (I) 6:1:NR(0) 58 :1046%(14)
Channel Catfish 3668:1020% (87) 22:1oNR(0) 15 :10129%(2)
Northern Pike I9:l:NR(O) 3:1oNR(0) 3 :10106%(2)
Carp 186:1082% (5) 45:1:NR(l) 4 :1:155%(1)
Lily Park Sevens Duffy Reach
No./1000m2 No./IOOOm2 No./IOO0m2
Total fish 118.4 14.7 5.97
Bluehead Sucker 10.4 5.8 0.30
Flannelmouth S 42.2 5.6 0.21
Roundtail Chub 0.03 1.01 0.09
Colo. Pikeminnow 0.10 0.05 0.08
White Sucker & Crosses 0.26 1.99 3.84
Smallmouth Bass 2.28 0.11 1.09
Channel Catfish 69.2 0.42 0.28
Northern Pike 0.36 0.06 0.06
Carp 3.5 0.85 0.07

The Lily Park site was established in 2000 because prior sampling (ISMP, Colorado

River Recovery Program, Elmblad per. Comm.) indicated a higher density of native fish,

which was confirmed. This is believed to be a function of habitat composition with mostly

rimes and runs and therefore similar to habitat in the 15-Mile reach. Habitat composition has

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