7963

• UCREFRP Catalog Number: 7963
• Author: U.S. Fish and Wildlife Service.
• Title: Streamflow Needs of Rare and Endangered Fishes
• USFW Year: 1990.
• USFW - Doc Type: Yampa River Interim Flow Recommendations - Final Report.
• Copyright Material: NO

Table 1 displays the projects in the baseline for the Little Snake and Yampa
Rivers.
Table 1
Yampa River
Hayden Power Station
Craig Power Station
Private Actions
Stagecoach Reservoir
Little Snake River
Cheyenne Stage I
Cheyenne Stage II - Little Snake
Total Depletion Above Green River Confluence
Depletion
7.1 K acre-feet
I9.2 K acre-feet
5.9 K acre-feet
12.8 K acre-feet
8.0 K acre-feet
15.8 K acre-feet
68.8 K acre-feet
The Service's HYDROSS model was then used to quantify the effects of the above
depletions on the Yampa River at Deerlodge Park. The model begins with gage
flows for the period 1930 to 1982 and subtracts depletions based on water
rights and availability. The results of the HYDROSS run were statistically
analyzed and are displayed in Attachment 2.
Several general trends can be identified by comparing Attachments 1 and 2.
The general trend is downward, with major reductions taking place in the peak
flow months; with smaller depletions in other months. There is also a trend
toward augmentation of flows from September through January of dryer years.
Table 2 displays these trends.
2