WSP00375

• File Number: 8200.760
• Description: Yampa River General
• State: CO
• Basin: Yampa/White
• Water Division: 6
• Date: 1/1/1983
• Author: USGS
• Title: Simulated Effects of Anticipated Coal Mining on Dissolved Solids in Selected Tributaries of the Yampa River - Northwestern Colorado - 1983
• Water Supply Pro - Doc Type: Report/Study

002471

Q =7.53Q +3.24.
P 0
The standard error of estimate is 8.35 ft3/s.

(9)

Partial record is available for input node 17, Fish Creek near Milner
from 1977 to 1980 (Science and Education Administration, Agriculture
Research, written commun., 1981). Discharge data missing from this partial
record and data for water years 1976 and 1981 were estimated from data for
Middle Creek near Oak Creek. Middle Creek is the second basin to the east of
Fish Creek; the elevation and drainage area for the streamflow gage at Middle
Creek near Oak Creek are similar to Fish Creek near Milner. The equation to
estimate missing mean monthly discharge data at Fish Creek from Middle Creek
is:

Q =1.57Q +6.56,
P 0
and the standard error of estimate is 10.979 ft3/s.

(7 )

Gaged data are available for input node 22, Elk River at Clark
(09241000). However, this streamflow gage monitors discharge for less than
one-half the Elk River drainage area (206 square miles). Because of this,
data for Elk River near Clark were adjusted using a period of concurrent
record from the discontinued streamflow-gaging station Elk River near Trull
(09242500), where discharge was measured for over three-fourths the total Elk
River drainage area (415 square miles). Mean monthly increases in Elk River
discharge from the station at Clark to the station near Trull were added to
the discharge data for the station Elk River near Clark to aCCQunt for more
drainage area and to give a better estimate of the discharge at the mouth of
the Elk River.

Data for input node 24, Grassy Creek at Grassy Gap (402330107082000),
included instantaneous-discharge measurements made in 1981 and 1982 (Maura,
1983). Input-discharge data for this station were estimated from the down-
stream station, Grassy Creek near Mount Harris (09244300), from the equation:

Q =0.16Q +0.18.
p 0
The standard error of estimate is 0.500 ft3/s.

(8)

The data
data at a site
gaged streams.
node 12, Foide1.
Oak Creek.

for output node 15, Middle Creek at mouth, is determined from
just below the confluence of Foidel and Middle Creeks--both
Discharge data at this node are the sum of the discharges for
Creek at mouth, near Oak Creek and node 13, Middle Creek near

Partial-discharge record was available for output node 19, Fish Creek at
mouth, near Mi1.ner, for the period 1977 to 1980 (U.S. Department of Agricul-
ture, Science and Education Administration, Agriculture Research, written
commun., 1981). Missing record was estimated from the next stream to the
east, Foidel Creek at mouth, near Oak Creek, from the equation:

11