8178

• UCREFRP Catalog Number: 8178
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flow Investigations.
• USFW Year: 1999.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

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pasture~ or hay fields. Large boulders are generally lacking in this reach, the gradient is
flat and the substrate is dominated by sand.

Hydrographs that summarize the 82-year period of record for the Maybell gauge
and flow were given in the 1998 progress report (Anderson 1998). The mean monthly
flow for September 1998 (188 cfs) was less than the average of the mean monthly flows
for the period of record for September (250 cfs). The August (495 cfs) and October (373
cfs) mean monthly flows for 1998 were higher than the average of the mean monthly
flows for the period of record for August (391 cfs) and October (354 cfs). The minimum
flow during the study period occurred on September 12, at 115 cfs (Figure 2), and was
close to the median minimum flow (129 cfs). Flow was less than 150 cfs for a total of
five days in 1998 and was under 200 cfs for 23 days.

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"l/ldltP" R\VEft

10

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10 Miles

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Figure 1. Location of the Sevens and Duffy habitat sampling stations, Yampa River.

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