7050

• UCREFRP Catalog Number: 7050
• Author: Andrews, E. D.
• Title: Effective And Bankfull Discharges of Streams In THe Yampa River Basin, Colorado and Wyoming
• USFW Year: 1980
• USFW - Doc Type: Journal of Hydrology
• Copyright Material: YES

318
TABLE I
Summary oC streamflows aad sediment loads Cor gaging station. in the Yampa River basin
Site U.S. Station name Drainage Mean Mean
number Geological area annual annual
in Survey (km2 ) discharge sediment
Fig. 1 Station (m3/s) load
No. (tons)
1 09260000 Little Snake River near Lily 9,660 16.3 1,300,000
2 09259700 Little Snake River near Baggs 7,820 14.8 330,000
3 09257000 Little Snake River near Dixon 2,560 14.6 150,000
4 09256000 Savery Creek near Savery 855 2.95 33,000
5 09255000 Slater Fork near Slater 417 2.10 20,000
6 09253000 Little Snake River near Slater 738 6.43 20,000
7 09251000 Yampa River near Maybell 8,820 43.9 490,000
8 09250600 Wilson Creek near Axial 51.8 0.051 790
9 09250400 Goodsprings Creek near Axial 90.5 0.057 500
10 09249750 Williams Fork at mouth near
Hamilton 1,200 6.10 190,000
11 09245000 Elkhead Creek near Elkhead 54.5 0.480 1,600
12 09244410 Yampa River below diversion
near Hayden 3,700 31.2 98,000
13 09244300 Grassy Creek near Mt. Harris 67.4 0.040 2,500
14 09242500 Elk River near Trull 1,080 16.8 39,000
15 09241000 Elk River at Clark 535 9.50 36,000

The total sediment-load vs. discharge relation may be combined with the
streamflow-duration relation to give a sediment-Ioad-duration relation for
the gaging station (Fig. 3). The relation represents the percentages of time a
given daily sediment load is equaled or exceeded.

Areal variation of sediment load and discharge

The mean-annual discharges and sediment loads at the 15 gaging stations
are listed in columns 5 and 6 of Table 1. A comparison of these values for the
station shows that annual sediment load and streamflow are not contributed
to the channel network evenly throughout the basin. In Fig. 4 the mean-an-
nual discharge and sediment load at each gaging station are expressed as per-
centages of the estimated streamflow and sediment load for the Yampa River
at Deerlodge Park. The relative proportion of sediment and water flowing
past individual gaging stations is significantly different. One of the most strik-
ing differences exists between values at sites on main-stem rivers draining the
two major subbasins, the Little Snake River near Lily (site 1) and the Yampa
River near Maybell (site 7). Although the drainage areas contributing to these
two gaging stations are about equal- 9,660 km2 for site 1 VB. 8,820 km2 for
site 7 - the respective sediment loads and streamflows are markedly different.

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