Table 9. Instream load, yield, and flow-weighted mean concentration for selected constituents and basins in the lower Tennessee River Basin, 1980-1996
[r2, coefficient of determination; s, standard deviation, in log units; MRL, minimum reporting limit of the analytical method; mi2, square miles; mg/L, milligrams per liter; entries in italics are subject to larger estimation error than the other entries, for various reasons (described in footnotes); <, less than; --, not estimated; regression statistics r2 and s are from the multivariate log-linear regression model of concentration against streamflow, season, and time; annual load, yield, and flow-weighted mean concentration were estimated for a common period: water year 1992. Where water-quality record was not available for that year, data from a year with similar hydrologic conditions to 1992 were used instead; the width of the model-calculated confidence interval partly indicates the error associated with the estimate; however, several sources of error are not accounted for in this interval, including sampling bias and data sparseness (see Appendix B)]
__________________________________________________________________________________________________________________________________________________________________________________
Annual Flow-weighted mean
Annual load yield concentration
________________________________ ________ _________________
No. of 95-percent confidence Seasonal
Site observations For the period of interval (March-
iden- Period of ______________ Regression available record For a ______________ Single Annual, July),
tifi- Surface-water station/site location record for Less statistics ________________________ single Lower Upper year single single
cation ____________________________________ load than _________ Mean Minimum Maximum year limit limit (tons/ year year
(fig. 2) Number Name estimates MRL Total r2 s (tons) (tons) (tons) (tons) (tons) (tons) mi2) (mg/L) (mg/L)
_________________________________________________________________________________________________________________________________________________________________________________
Total nitrogen
1 PRI038 Clarks River at Almo, Ky. 1985-95 0 132 0.15 0.38 490 220 1,000 320 240 400 2.4 2.8 1.2
[1987] [1989] [1992]
2 03604000 Buffalo River near Flat 1982-95 0 36 .20 .55 490 280 710 460 310 600 1.0 .55 .28
Woods, Tenn. [1986] [1983] [1992]
4 001025 Duck River below Normandy 1986-95 0 27 .28 .41 220 84 280 200 140 250 1.0 .53 .36
Dam, Tenn. [1988] [1989] [1992]
5 001065 Duck River at Williamsport, 1982-94 0 52 .36 .33 3,800 1,500 6,400 3,000 2,100 4,000 2.1 1.2 .47
Tenn. [1986] [1983] [1992]
6 475793 Duck River above Hurricane 1986-93 0 44 .48 .36 4,700 2,200 7,600 4,500 3,200 5,800 1.8 1.1 .40
Mills, Tenn. [1986] [1989] [1992]
7 002395 Shoal Creek at Highway 43, 1983-92 0 32 .31 .39 480 200 950 500 230 780 2.9 1.5 .62
near Lawrenceburg, Tenn. a [1988] [1983] [1992]
9 001207 Elk River below Tims Ford 1984-94 0 36 .32 .37 620 160 1,100 530 370 680 .99 .61 .30
Dam, Tenn. [1988] [1994] [1992]
10 475796 Elk River near Prospect, Tenn. 1987-92 0 43 .64 .30 6,600 1,600 10,000 5,300 3,600 7,000 3.0 1.8 .49
[1988] [1989] [1992]
11 FLCR7 Flint Creek near Falkville, Ala. 1993-97 0 67 .32 .57 220 140 290 200 110 290 2.4 1.1 .45
[1995] [1997] [1994]
12 TOWN- Town Creek near Geraldine, Ala. 1988-96 0 72 .47 .40 880 550 1,900 550 460 640 3.5 2.3 .78
CREEK15b [1992] [1989] [1992]
13 002375 Sequatchie River at Valley 1983-94 0 39 .32 .44 960 370 1,500 810 620 1,000 1.4 .70 .40
Road, Tenn. a [1988] [1982] [1992]
14 03609750 Tennessee River at Highway 60 1980-84 0 30 .53 .36 60,000 21,000 89,000 56,000 45,000 68,000 1.4 .95 .41
near Paducah, Ky. [1981] [1983] [1982]
15 202832 Tennessee River at mile 23, 1990-94 0 26 .61 .20 52,000 38,000 65,000 38,000 32,000 44,000 .94 .68 .29
Ky. c [1992] [1991] [1992]
16 03593005 Tennessee River at Pickwick 1980-95 0 64 .53 .28 43,000 20,000 66,000 36,000 29,000 42,000 1.1 .71 .29
Landing Dam, Tenn. [1988] [1990] [1992]
17 03571850 Tennessee River at South 1980-85 0 37 .15 .58 38,000 21,000 53,000 43,000 23,000 63,000 1.9 1.1 .45
Pittsburg, Tenn. [1981] [1984] [1982]
18 003315 Tennessee River below Raccoon 1981-94 0 152 .39 .49 29,000 10,000 51,000 20,000 17,000 23,000 .94 .59 .24
Mountain, Tenn. [1988] [1982] [1992]
Total ammonia
1 PRI038 Clarks River at Almo, Ky. 1985-95 70 133 .19 1.13 25 11 53 11 <1 23 .09 .10 .05
[1993] [1989] [1992]
2 03604000 Buffalo River near Flat 1987-92 3 28 .39 .52 15 8.0 18 17 7.7 26 .04 .02 .01
Woods, Tenn. [1988] [1989] [1992]
4 001025 Duck River below Normandy 1987-95 0 27 .70 .92 40 21 45 38 18 58 .20 .10 .06
Dam, Tenn. [1995] [1990] [1992]
5 001065 Duck River at Williamsport, 1984-94 7 43 .47 .82 250 100 540 160 45 270 .11 .06 .02
Tenn. [1994] [1984] [1992]
6 475793 Duck River above Hurricane 1987-94 12 53 .12 1.10 230 110 400 220 <1 590 .09 .06 .01
Mills, Tenn. [1993] [1989] [1992]
7 002395 Shoal Creek at Highway 43, 1984-94 14 38 .41 .95 29 6.1 56 31 <1 110 .18 .09 .02
near Lawrenceburg, Tenn. a [1993] [1983] [1992]
9 001207 Elk River below Tims Ford 1984-94 8 37 .45 1.00 120 17 220 130 11 260 .25 .15 .02
Dam, Tenn. [1988] [1984] [1992]
10 475796 Elk River near Prospect, Tenn. 1987-94 8 57 .30 .87 820 57 2,700 720 <1 2,000 .40 .24 .03
[1988] [1991] [1992]
11 FLCR7 Flint Creek near Falkville, Ala. 1993-97 4 66 .30 .86 10 5.0 14 10 3.1 17 .12 .05 .03
[1995] [1993] [1994]
12 TOWN- Town Creek near Geraldine, 1988-96 40 77 .14 1.27 30 17 55 17 5.5 28 .11 .07 .03
CREEK15 Ala. d [1992] [1989] [1992]
13 002375 Sequatchie River at Valley Road, 1983-94 12 41 .37 1.06 99 19 400 50 19 81 .09 .04 .02
Tenn. a [1988] [1983] [1992]
15 202832 Tennessee River at mile 23, 1990-94 5 33 .33 .91 5,000 2,900 8,700 4,000 770 7,200 .10 .07 .02
Ky. c [1990] [1994] [1992]
16 03593005 Tennessee River at Pickwick 1980-92 2 45 .35 .58 2,300 880 4,700 1,900 1,100 2,700 .06 .04 .02
Landing Dam, Tenn. [1988] [1980] [1992]
Total ammonia plus organic nitrogen
1 PRI038 Clarks River at Almo, Ky. 1986-93 0 101 .29 .43 200 76 550 100 62 140 .76 .89 2.3
[1987] [1989] [1992]
2 03604000 Buffalo River near Flat 1982-95 21 61 .32 .83 200 73 400 140 86 190 .32 .17 .09
Woods, Tenn. [1995] [1983] [1992]
4 001025 Duck River below Normandy 1987-95 0 27 .20 .53 140 59 170 140 81 190 .70 .36 .19
Dam, Tenn. [1988] [1989] [1992]
5 001065 Duck River at Williamsport, 1981-92 1 53 .29 .62 2,300 500 4,900 1,700 220 3,100 1.2 .67 .19
Tenn. [1981] [1983] [1992]
6 475793 Duck River above Hurricane 1986-93 1 47 .33 .59 2,800 930 5,400 2,600 130 5,200 1.0 .66 .17
Mills, Tenn. [1986] [1989] [1992]
7 002395 Shoal Creek at Highway 43, 1983-94 0 39 .52 .66 140 49 380 94 <1 200 .53 .27 .07
near Lawrenceburg, Tenn. a [1993] [1983] [1992]
9 001207 Elk River below Tims Ford 1984-94 3 39 .39 .64 280 77 620 190 94 290 .37 .23 .09
Dam, Tenn. [1988] [1984] [1992]
10 475796 Elk River near Prospect, Tenn. 1986-93 0 49 .60 .53 2,900 570 5,900 2,800 960 4,600 1.6 .91 .17
[1988] [1989] [1992]
11 FLCR7 Flint Creek near Falkville, Ala. 1993-97 4 60 .28 .72 82 49 160 69 35 100 .80 .37 .15
[1995] [1997] [1994]
12 TOWN- Town Creek near Geraldine, Ala. 1988-96 4 76 .51 .56 140 63 430 78 60 96 .50 .33 .12
CREEK15 [1995] [1988] [1992]
13 002375 Sequatchie River at Valley Road, 1983-94 4 42 .24 .79 300 100 660 220 120 300 .37 .19 .09
Tenn. a [1988] [1983] [1992]
14 03609750 Tennessee River at Highway 60 1980-84 0 41 .24 .49 37,000 14,000 53,000 30,000 22,000 37,000 .73 .50 .23
near Paducah, Ky. [1981] [1984] [1982]
15 202832 Tennessee River at mile 23, 1990-94 0 32 .34 .31 24,000 16,000 32,000 16,000 12,000 20,000 .40 .29 <.01
Ky. c [1992] [1990] [1992]
16 03593005 Tennessee River at Pickwick 1986-93 3 36 .45 .41 16,000 11,000 22,000 14,000 11,000 17,000 .42 .27 .15
Landing Dam, Tenn. [1988] [1989] [1992]
17 03571850 Tennessee River at South 1980-85 3 40 .18 .94 23,000 9,500 35,000 25,000 3,900 46,000 1.1 .65 .22
Pittsburg, Tenn. [1981] [1984] [1982]
18 003315 Tennessee River below Raccoon 1981-94 4 158 .39 .66 16,000 5,000 31,000 9,300 7,500 11,000 .43 .27 .12
Mountain, Tenn. [1988] [1983] [1992]
Total nitrite plus nitrate nitrogen
1 PRI038 Clarks River at Almo, Ky. 1985-95 0 133 .16 .55 320 150 580 220 150 290 1.6 1.9 .79
[1987] [1989] [1992]
2 03604000 Buffalo River near Flat 1986-93 5 38 .47 .58 230 120 400 220 82 350 .48 .26 .10
Woods, Tenn. [1986] [1989] [1992]
4 001025 Duck River below Normandy 1987-95 0 27 .78 .50 89 22 140 69 47 91 .36 .18 .18
Dam, Tenn. [1988] [1991] [1992]
5 001065 Duck River at Williamsport, 1982-93 0 56 .16 .30 1,900 780 2,700 1,800 1,300 2,300 1.2 .71 .34
Tenn. [1986] [1983] [1992]
6 475793 Duck River above Hurricane 1987-93 2 48 .41 1.09 3,200 2,200 4,700 2,800 1,200 4,400 1.1 .70 .25
Mills, Tenn. [1988] [1987] [1992]
7 002395 Shoal Creek at Highway 43, 1983-94 0 40 .25 .37 280 140 460 250 200 300 1.4 .74 .38
near Lawrenceburg, Tenn. a [1988] [1983] [1992]
9 001207 Elk River below Tims Ford 1984-94 0 39 .42 .68 450 70 1,500 420 160 690 .80 .49 .23
Dam, Tenn. [1988] [1994] [1992]
10 475796 Elk River near Prospect, Tenn. 1987-93 0 51 .22 .41 3,100 1,000 4,700 2,700 2,000 3,500 1.5 .89 .33
[1988] [1991] [1992]
11 FLCR7 Flint Creek near Falkville, Ala. 1993-97 1 67 .69 .57 150 100 200 140 48 230 1.6 .74 .33
[1995] [1997] [1994]
12 TOWN- Town Creek near Geraldine, Ala. 1988-96 0 77 .46 .60 570 440 790 440 330 550 2.8 1.8 .64
CREEK15 [1992] [1989] [1992]
13 002375 Sequatchie River at Valley Road, 1983-94 12 43 .15 .71 680 250 1,400 640 400 870 1.1 .55 .32
Tenn. a [1988] [1994] [1992]
14 03609750 Tennessee River at Highway 60 1980-84 0 41 .58 .55 27,000 7,400 38,000 23,000 15,000 31,000 .57 .39 .13
near Paducah, Ky. [1981] [1984] [1982]
15 202832 Tennessee River at mile 23, 1990-94 8 33 .77 .95 79,000 41,000 120,000 62,000 <1 130,000 1.5 1.1 .27
Ky. c [1990] [1994] [1992]
16 03593005 Tennessee River at Pickwick 1980-94 6 77 .70 .39 24,000 8,500 40,000 18,000 13,000 23,000 .56 .36 .13
Landing Dam, Tenn. [1988] [1980] [1992]
17 03571850 Tennessee River at South 1980-85 0 38 .37 .24 13,000 8,000 16,000 14,000 12,000 16,000 .62 .37 .15
Pittsburg, Tenn. [1981] [1983] [1982]
18 003315 Tennessee River below Raccoon 1981-94 0 158 .43 .40 13,000 4,700 19,000 11,000 9,900 12,000 .52 .32 .13
Mountain, Tenn. [1988] [1982] [1992]
Total phosphorus
1 PRI038 Clarks River at Almo, Ky. 1985-95 0 132 .57 .49 62 29 160 40 27 53 .30 .35 .14
[1995] [1989] [1992]
2 03604000 Buffalo River near Flat 1983-95 9 56 .25 .74 27 12 52 19 9 29 .04 .02 .01
Woods, Tenn. [1995] [1983] [1992]
4 001025 Duck River below Normandy 1987-95 6 24 .68 .91 20 3.0 34 15 <1 32 .08 .04 .01
Dam, Tenn. [1994] [1990] [1992]
5 001065 Duck River at Williamsport, 1981-93 0 68 .11 .86 1,700 390 3,300 1,300 120 2,600 .93 .53 .18
Tenn. [1981] [1983] [1992]
6 475793 Duck River above Hurricane 1988-93 0 43 .33 .63 2,900 1,500 4,700 2,900 <1 6,500 1.1 .73 .16
Mills, Tenn. [1993] [1991] [1992]
7 002395 Shoal Creek at Highway 43, 1983-94 2 39 .30 .93 39 14 60 26 10 42 .15 .08 .02
near Lawrenceburg, Tenn. a [1994] [1983] [1992]
9 001207 Elk River below Tims Ford 1983-94 16 41 .68 1.10 68 2.0 140 17 <1 40 .03 .02 <.01
Dam, Tenn. [1994] [1987] [1992]
10 475796 Elk River near Prospect, Tenn. 1986-94 0 56 .31 .60 1,400 290 3,100 1,600 330 2,800 .89 .52 .10
[1988] [1991] [1992]
14 03609750 Tennessee River at Highway 60 1980-84 0 31 .50 .31 5,000 2,000 6,900 4,800 3,900 5,700 .12 .08 .03
near Paducah, Ky. [1981] [1980] [1982]
15 202832 Tennessee River at mile 23, 1990-94 0 34 .40 .41 4,900 3,200 6,300 3,200 2,100 4,300 .08 .06 .02
Ky. c [1992] [1989] [1992]
16 03593005 Tennessee River at Pickwick 1980-93 1 71 .16 .48 3,600 1,300 6,500 3,900 2,300 5,400 .12 .08 .02
Landing Dam, Tenn. [1988] [1991] [1992]
17 03571850 Tennessee River at South 1980-86 2 40 .23 .45 1,300 520 2,000 1,600 1,200 2,000 .07 .04 .02
Pittsburg, Tenn. [1986] [1980] [1982]
Dissolved orthophosphorus
2 03604000 Buffalo River near Flat 1984-95 18 54 .26 .43 10 4.5 18 11 3.2 19 .03 .01 .01
Woods, Tenn. [1986] [1989] [1992]
6 475793 Duck River above Hurricane 1986-91 0 38 .25 .43 870 220 1,500 940 81 1,800 .37 .23 .07
Mills, Tenn. [1986] [1989] [1990]
10 475796 Elk River near Prospect, Tenn. 1987-91 0 38 .22 .45 800 230 1,300 820 300 1,400 .46 .27 .07
[1988] [1989] [1987]
11 FLCR7 Flint Creek near Falkville, 1993-97 15 62 .73 .39 12 5.5 16 13 9.0 17 .16 .07 .02
Ala. d [1995] [1993] [1994]
12 TOWN- Town Creek near Geraldine, 1988-96 29 74 .28 1.55 47 21 110 21 2.1 40 .13 .09 .04
CREEK15 Ala. d [1992] [1996] [1992]
15 202832 Tennessee River at mile 23, 1990-94 1 33 .64 .56 3,200 1,900 4,200 3,500 1,300 5,800 .09 .06 .01
Ky. c [1990] [1991] [1992]
16 03593005 Tennessee River at Pickwick 1983-93 11 49 .49 .52 2,200 520 5,000 2,600 700 4,400 .08 .05 .09
Landing Dam, Tenn. [1988] [1991] [1992]
Suspended sediment
2 03604000 Buffalo River near Flat 1982-95 0 65 .50 .71 29,000 9,800 92,000 20,000 <1 55,000 f65 f35 --
Woods, Tenn. [1986] [1983] [1992]
3 03596000 Duck River below Manchester, 1979-83 0 30 .71 .46 11,000 820 17,000 16,000 <1 47,000 f100 f72 --
Tenn. e [1981] [1980] [1982]
8 03588500 Shoal Creek at Iron City, 1979-83 1 29 .56 .74 91,000 3,900 240,000 41,000 <1 110,000 f260 f140 --
Tenn. e [1981] [1983] [1982]
16 03593005 Tennessee River at Pickwick 1980-93 0 68 .09 .71 850,000 260,000 1,800,000 1,000,000 330,000 1,700,000 f26 f17 --
Landing Dam, Tenn. [1986] [1991] [1992]
17 03571850 Tennessee River at South 1980-86 0 43 .22 .61 390,000 140,000 600,000 480,000 260,000 690,000 f17 f10 --
Pittsburg, Tenn. [1986] [1980] [1982]
_________________________________________________________________________________________________________________________________________________________________________________
a Estimates are subject to error because streamflow-gaging and water-quality-sampling sites were not colocated.
b Station number in Alabama Department of Environmental Management study is t5.
c Load estimates are subject to error due to grab sampling methods at this vertically stratified site.
d Load estimates are subject to error due to variable MRL (ranging from 0.03 to 0.2 mg/L), and the large percentage of observations below MRL.
e Included data from 1979 for calibration and load estimation, in order to have sufficient length of record.
f Annual yield and flow-weighted mean concentration for sediment were estimated for the period of available record, rather than for the single year,
because a common overlapping period was not available.
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