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<br />gages through water year 1994. (The databases used for this summary contained no bed-load
<br />measurements.) Information relating to the peak flow data was obtained from a database
<br />maintained by Hydrosphere Data Products, Inc., and information relating to mean daily flow,
<br />suspended sediment, and bed material data were obtained from a database maintained by
<br />Earthlnfo, Inc. Tables 1 through 4 include the period of record for each data type, record count,
<br />and summary statistics for the discharge records for all the mainstem gaging stations and the
<br />downstream-most stations on tributaries within the reaches of interest.
<br />
<br />2.2 Data from Individual Studies
<br />
<br />Data from individual studies include cross sections, longitudinal profiles, streamflow
<br />measurements, bed material, bed load, and suspended sediment load. The studies from which
<br />these data were derived were performed to address a variety of issues, including sediment
<br />transport dynamics, sediment budgets, incipient motion conditions, and substrate conditions at
<br />vegetation study sites. The data summaries are sorted by stream and data type. Tables 5
<br />through 10 summarize data collected on the Yampa River (and the lower portion of the Little
<br />Snake River) and Tables 11 through 16 summarize data collected on the Green River. The
<br />summaries include the location at which the data were collected, the date, investigator(s) and
<br />organization, a publication reference if available, data collection method, and, where appropriate,
<br />clarifying remarks. The cross-section data include data obtained by a variety of methods,
<br />including traditional survey methods, sonar traces, and depth profiles from discharge
<br />measurements. Longitudinal profiles include data from cross-section surveys in which the cross
<br />sections were tied together, horizontally and vertically, as well as surveys of the channel thalweg,
<br />water-surface elevations, high-water marks, and slack-water deposits. Bed material data include
<br />qualitative assessments of the channel substrate, results from sieve analysis of bulk bed and bank
<br />samples, and samples obtained using the Wolman pebble count technique. All bed-load data
<br />were collected using a 3-inch Helley-Smith bed-load sampler. Suspended-sediment data were
<br />collected using standard USGS methods with the appropriate sampler.
<br />
<br />In addition to the above information that was compiled primarily from hydraulic, geomorphology,
<br />sediment transport studies, and stream-gaging studies, a summary of known PHABSIM studies
<br />is presented in Table 17.
<br />
<br />3. REFERENCES
<br />
<br />Andrews, ED., 1978. Present and Potential Sediment Yields in the Yampa River Basin, Colorado
<br />and Wyoming. U.S. Geological Survey, Water Resources Division, Water Resources
<br />Investigations 78-105, December.
<br />
<br />Andrews, E.D., 1980. Effective and Bankfull Discharges of Streams in the Yampa River Basin,
<br />Colorado and Wyoming. Journal of Hydrology, 46(1980), pp. 311-330.
<br />
<br />Andrews, E.D., 1986. Downstream Effects of Flaming Gorge Reservoir on the Green River,
<br />Colorado and Utah. Geological Society of American Bulletin, Vol. 97, August, pp. 1012-
<br />1023.
<br />
<br />Andrews, ED. and J.M. Nelson, 1988.. Topographic Response of a Bar in the Green River, Utah,
<br />to Variation in Discharge, U.S. Geological Survey Water Resources Division, Lakewood,
<br />Colorado.
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<br />Mussetter Engineering. Inc.
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