9431

• UCREFRP Catalog Number: 9431
• Author: Chafin, D. T.
• Title: Evaluation of Trends in pH in the Yampa River, Northwestern Colorado, 1950-2000.
• USFW Year: 2002.
• USFW - Doc Type: Denver.
• Copyright Material: NO

H
Z
Q
Z
H
Z
2
9.4
9.2
9.0
8.8
8.6
8.4
8.2
8.0
170
Z Q 160
lL ~ 150
~ Q
}
O ~ 140
~ ~ 130
J z 120
O ~ 110
~ a 100
90
350
ZO ~ 300
0] Z
Q U 0 250
o ~ Q 200
J 0 ~ 150
OXQ
tnQU 100
~ ~
~ 50
0
X 1.4
~ 1.2
Z 1.0
3
`~ Colorado water-quality standard
~ ~ 6 8
~,,~,
~~2 5 0
9 -
~10 -- 12~
3 ~
I
I ~
I ~\
I ~
~ ~ 6
q ~'- ----__ 8
I Q 5 ~j ---f, ~0
I \-`~~
~ ~~-9~~i ------ 12
2 ----__
1
f -
~ -
~ -
\~~ ~ -
O 11 -
\~f 4 10 t' ----__
~ ~ -i
\~ 5 ___-~---------~ _
t ~.•--------- ~---------- 8 9
~ ~ -
3 ~~ -
~ O10 =
~ -
8 -
1 i ~~ ~ -•-----------w 12 -
\ ___-__ s ~ -----------
~_ i s.e ~------------
_---~2 5____ _
Calcite oversaturated
Calcite undersaturated
4
230 220 200 180 160 140 120 100 80 60 40
DISTANCE FROM MOUTH OF YAMPA RIVER, 1N RIVER MILES
EXPLANATION
-t- Yampa River site Q Tributary site
Note: number by symbol indicates site number in
tables 1 and 3
zO o.s
~ o.s
~ 0.4
~ 0.2
o
w -0.2
~ -0.4
J -0.6
Q
U -0.8
Figure 5. pH and other geochemical indicators at Yampa River and tributary sites, August 16-19, 1999.
20 0
10 Evaluation of Trends in pH in the Yampa River, Northwestern Colorado, 1950-2000