table 3

Table 3. Dissolved chloride and dissolved sulfate concentrations in the lower Red River (main stem) Basin, Texas, 1997–98

[mg/L, milligrams per liter; USGS, U.S. Geological Survey; RRA, Red River Authority of Texas; --, not sampled; Hwy., Highway; FM, Farm to Market Road]

Sam- pling site no. (fig. 1)	Site name	Dissolved chloride (mg/L)				No. of sam- ples	Dissolved sulfate (mg/L)				No. of sam- ples	Data source
Sam- pling site no. (fig. 1)	Site name	Mini- mum	Maxi- mum	Median	Ave- rage	No. of sam- ples	Mini- mum	Maxi- mum	Median	Aver- age	No. of sam- ples	Data source
1	Red River near Terral, Okla.	560	1,400	1,000	950	6	590	950	840	793	6	USGS
2	Red River near Gainesville, Tex.	190	1,400	785	818	24	140	1,000	635	637	24	USGS
3	Red River at Denison Dam near Denison, Tex.	210	360	290	290	24	240	410	315	321	24	USGS
4	Red River near Bonham, Tex.	300	370	352	341	3	280	434	400	371	3	RRA
5	Red River at U.S. Hwy. 271 at Arthur City, Tex.	--	--	--	--	--	--	--	--	--	--	--
6	Red River near De Kalb, Tex.	96	230	180	172	11	120	260	220	202	11	USGS
7	Red River at Index, Ark.	150	190	170	170	5	180	220	210	204	5	USGS
8	Big Mineral Creek at FM 901 near Sadler, Tex.	76	144	86	98	4	90	135	100	114	4	RRA
9	Choctaw Creek at U.S. Hwy. 69 near Denison, Tex.	64	284	174	174	2	150	319	234	234	2	RRA
10	Choctaw Creek at FM 1753 near Denison, Tex.	28	231	130	130	2	105	270	188	188	2	RRA
11	Bois D’Arc Creek at FM 100 near Honey Grove, Tex.	11	21	16	16	2	44	52	48	48	2	RRA