9568

• UCREFRP Catalog Number: 9568
• Author: Resource Consultants Inc.
• Title: Sediment Transport Studies of the Little Snake, Yampa, and Green River Systems.
• USFW Year: 1991.
• USFW - Doc Type: Fort Collins, CO.
• Copyright Material: NO

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Figure 3.2 Stream gaging and sediment sampling with a
truck-mounted boom.

Velocity measurements were made with a Marsh..McBirney meter at the 0.6 depth. Typically 15 to
25 stations were evenly spaced across the flow from bank to bank. A USGS type DH-49 suspended
sediment sampler was used for making suspended sample measurements. The sample was depth
integrated for several cross-stations using several bottles. During cable suspended measurements, a 65 lb.,
3 inch x 3 inch nozzle Helley-Smith bedload sediment sampler was used to collect bedload samples at
regularly spaced stations. During hand suspended measurement, a hand held 3 inch x 3 inch Helly-Smith
sampler was utilized.

Bed material was sampled using both grid and grab sample techniques. A two foot square grid
with 0.1 foot division was used to sample cobble-gravel bed material. The photo analysis, grid by number
technique was utilized for gradation analysis (Kellerhals and Bray, 1971). Samples were taken at the Little
Snake sites and during the Yampa Canyon reconnaissance trip, but flows did not permit photo grid
sampling at the Yampa sites above Deerlodge Park. Bed, bar and bank grab samples of bed material were
also taken at selected Little Snake sites during lower flows.

3.4 Discharge Data

3.4.1 Daily Discharlle Data Above the Yampa Canyon. Sampling dates were scheduled through the
use of automated telemetry data stations through the Colorado State Engineer's Water Database. Three
sites used for this purpose were:

Yampa River at Mayben, CO

YAMAYBCO

Little Snake River near Lily, CO

LSRLILCO

Little Snake River near Dixon, WY

LSRDIXWY

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The 1989 runoff season hydrographs for these sites are shown in Figs. 3.3-3.5, respectively. Some
of the data plotted were obtained as preliminary data and may change after review and evaluation;
however, for the purposes of scheduling field trips and evaluating the accuracy of the RCI collected data,
these results were considered adequate.

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