8221 - Laserfiche WebLink

Home Browse Search

26 ."1' .. I J .......j. ~'. . ~ . J .']-' ~ ~ J I :1 .: I '\ vegetation (Williams and Wolman, 1984). All dams with a storage capacity greater than 5,000 acre-feet (6,167,000 cubic meters), their location and time of construction were catalogued, mostly by Liebermann et al. (1989), and will be discussed in relation to their poten~ial impacts on the study area. Above the study area, two gauges were used to illustrate the effect of specific dams, and two gauges were used to illustrate the combined effects of these dams on the main stem of the upper Colorado River. The two gauges below specific dams are the Colorado River near Granby (Shadow Mt. and Granby dams), and the Blue River below Green Mt. Reservoir (Green Mt. and Dillon dams) (Figure 3.2). The two gauges on the mainstem are the Colorado River at Hot Sulphur Springs (below Shadow Mt., Granby, Willow Creek, and Meadow Creek dams), and the Colorado River near Glenwood Springs (below Dillon, Green Mt., Homestake, and Williams Fork dams in addition to those for Hot Sulphur Springs). Mean peak and mean annual flows before and after dam construction were compared to illustrate the effects of the dams on streamflow. :'l The Study Area The cumulative effects of water development on streamflow through the study area were determined by examining flow records from USGS gauges on the Colorado River near Cameo, approximately 18 kilometers (11 mi) upstream of the study area (Figure 3.2), and on the Colorado River near Cisco which is approximately 90 kilometers (56 mi) downstream. The Cameo gauge has a complete record from 1934 and is a good representation of flows in the 15 mile reach. The Cisco gauge has a complete record from 1914, and is representative of the 18 mile reach I