Sam-
pling
site no.
(fig. 1)

Site name

Specific conductance
(µS/cm)

No. of
discrete
samples

Data
source

Mini-
mum

Maxi-
mum

Median

Aver-
age

Continuous
monitor
average

1

Red River near Terral, Okla.

¹653

¹20,600

¹4,765

¹4,902

3,794

24

USGS, RRA

2

Red River near Gainesville, Tex.

¹1,090

¹6,030

¹3,740

¹3,847

3,527

35

USGS, RRA

3

Red River at Denison Dam near Denison, Tex.

¹1,400

¹1,990

¹1,795

¹1,786

1,478

24

USGS

4

Red River near Bonham, Tex.

1,402

2,010

1,934

1,876

--

9

RRA

5

Red River at U.S. Hwy. 271 at Arthur City, Tex.

173

1,496

1,053

963

--

15

USGS

6

Red River near De Kalb, Tex.

617

1,570

1,170

1,149

--

16

USGS, RRA

7

Red River at Index, Ark.

276

1,443

998

945

--

24

USGS, RRA

8

Big Mineral Creek at FM 901 near Sadler, Tex.

443

1,337

942

908

--

12

RRA

9

Choctaw Creek at U.S. Hwy. 69 near Denison, Tex.

522

2,509

1,933

1,630

--

8

RRA

10

Choctaw Creek at FM 1753 near Denison, Tex.

658

1,763

1,272

1,242

--

4

RRA

11

Bois D’Arc Creek at FM 100 near Honey Grove, Tex.

210

1,017

560

596

--

12

RRA