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• Downstream of the White River (Below Ouray) In the spring of 1996, a level logger was installed about 0.5 miles downstream~lf the confluence of the White and Green Rivers on the bedrock escarpment on the east side of river. This level logger will monitored the combined discharges of the White, Duchesne and Green Rivers. The Duchesne confluence with the Green River is 1.5 miles upstream of the White and Green River confluence. The level logger is located at beginning of a straight reach of river along the left escarpment. The channel is stable at this slight channel constriction. The old USGS Ouray gage site is downstream approximately one mile where the river contacts the bluff on the western side of the • valley. ~ Desolation Cannon A level logger was established at McPherson Ranch in Desolation Canyon. This location provided the only access to the river by vehicle from Sand Wash to Green River. It is approximately 86 miles downstream of the level logger near the White River and 40 miles upstream of the Green River USGS gage. The level logger is less than one mile upstream of the McPherson Ranch ruins on river left. This reach of river is series of boulder riffles and pools and the river width is controlled in large part by canyon geology. There is very limited floodplain in most of Desolation Canyon. The channel cross section at this site is very stable. The access to the gage by road requires about a six hour drive from Vernal, Utah. ^ Green River Gage - The USGS gage at Green River has been in continuous operation since l 895 except for a few years around the turn of the century. The gage is located just upstream of the Denver and Rio Grande Railroad Bridge at Green River, Utah. Established in an alluvial reach of river, the gage site is subject to some scour and deposition. In 1996, rating curve stage shifts were noted of +2.4 on April 25, -0.23 on May 23, and 1.4 on June 25. Canyonlands As was previously discussed, a level logger was erected in Canyonlands at Queen Anne Bottom in 1995 approximately 32.5 miles upstream of the confluence with the Colorado River. It is approximately 88 miles downstream of the Green River USGS gage. The location of the level logger was selected for the Canyonlands flooded bottomlands research involving the backwater nursery habitat for the larval fish razorback sucker. The level logger was complimented with the erection of a staff gage at Bonita Bend. The channel morphology is controlled in large part by the canyon geology and the site is stable under a wide range of flows. 4