9473

• UCREFRP Catalog Number: 9473
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flows Investigations.
• USFW Year: 2001.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

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Spring and peak flows recorded at the Maybell gage were fairly similar for the years

1998, 1999 and 2000, with peak flows of 10,040 cfs, 9,980 cfs and 9,830 cfs, respectively

(Figure 2). Also since the median peak flow for the period of record for the Maybell gage (84

years) is 10,000, these three years are in the range ofa normal peak flow. The 2000 spring

hydrograph dropped fast and by mid June flows were well below those of the two prior years

(Figure 2).

12000

10000

8000

6000

4000

2000

o
3/15 3/29 4/12 4/26 5/10 5/24

J!!
(.)

1998

1999

2000

6/7

6/21 7/5

7/19

Figure 2. Mean daily flow between March 15 and July 31 at the Maybell gage, Yampa River
for 1998, 1999 and 2000.

Summer flows were below normal in 2000 which provided an opportunity to sample

the river under different flow conditions than the two prior years, which were near normal

(Figure 3). The minimum flow in 2000 was 30-cfs compared to 166 cfs in 1999 and 115 cfs in

1998. The median minimum summer flow for the period of record is 128 cfs. The 10-day

minimum flow (tenth lowest during the summer) in 1998, 1999, and 2000 was 170 cfs, 212

cfs, and 50 cfs, respectively with a median condition of IS3 cfs. Flow was below 93 cfs

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