WSP12249

• File Number: 8240.200.10.B
• Description: UCRBRIP - Riverine Fish Flow Investigations
• Basin: Colorado Mainstem
• Date: 6/1/2004
• Author: CDOW
• Title: Riverine Fish Flow Investigations 2004
• Water Supply Pro - Doc Type: Publication

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dominant smallmouth bass age group at Lily Park in 2003 was age-I fish in the range of9 to
18 cm (Figure A I-52). Even though mean length of smallmouth bass was highest in 2003
there were very few bass> 25 cm in the 2003 sample,

Ha"den, Junioer, Ma.-bell and Iii" Park - below

A joint electro- fishing and seining effort was made September II - 12, 2003 with
Colorado College. Dr. Brian Linkhart and Dr, Ed Wick supervised shoreline and backwater
seining. I collected fish from the main channel with the raft shocker. The most upstream site
was just below the Hwy 40 Bridge located two miles below the town of Hayden, We
accessed at the Yampa River State Park Double Bridges boat launch. About 300 m of the
river was sampled, The fish sampling at Juniper was from below the CR 53 Bridge to about
300 m downstream, At Maybell electro-fishing began about 300 m above the CR 19 Bridge
and ended under the bridge, At Lily Park the sampling was from just upstream of the CR 25
bridge to a low head diversion dam about 200 m downstream.

At Double Bridges at RM 148, about 50 miles upstream of Duffy, only two native
fish --one speckled dace and one mottled sculpin -- were captured from a total sample of 222
fish (Table 14), Small mouth bass were 97% of the catch for fish less than 15 cm and 77% of
the total catch. White sucker and hybrids were 71 % of the catch for fish larger than 15 cm
(Table 14), Only one fish was captured by seining and backpack shocking (Table 15).

At Juniper Hot Springs (RM 90) small mouth bass was 100% of the catch for fish less
than 15 cm and 75% of the total catch from the main channel (Table 14). Bluehead sucker
was the most common species for tish over 15 cm. All were captured from the same riffle
below the Juniper Bridge. A large number of Age-O bluehead sucker were collected from a
large backwater (Table 15),

,

White sucker was the most common species of fish over 15 cm at the Maybell Bridge
(RM 72) (Table 14), No native fish less than IS cm were collected at Maybell with raft
shocking, seining or backpack shocking (Tables 14 and 15).

At Lily Park (RM 52) channel catfish were 51 % and tlannelmouth sucker were 32%
of the fish over 15 em (Table 14), Small mouth bass (99%) and green sunfish (I %)
accounted for fish less than 15 cm (Table 14). Seining and backpack shocking found sand
shiners and fathead minnow were abundant. Three speckled dace were the only native
species, One Age-O channel catfish were collected by seining (Table 15),

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