LOCATION.-- Lat 42°36'33", long 89°04'14" (NAD of 1927), in NE 1/4 sec.28, T.2 N., R.12 E., Rock County, Hydrologic Unit 07090001, on right bank in Afton, 0.3 mi downstream from highway bridge and 1.1 mi upstream from Bass Creek. |
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DRAINAGE AREA.-- 3,340 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: January 1914 to current year. Monthly discharge for January 1914 published in WSP 1308. |
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REVISED RECORDS.-- WSP 1238: 1916(M), 1919(M), 1933, 1937-38, 1943. WDR WI-79-1: Drainage area. |
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GAGE.-- Water-stage recorder and satellite telemeter. Datum of gage is 742.36 ft above NGVD of 1929. Prior to Aug. 23, 1932, a nonrecording gage 20 ft upstream, and Aug. 23, 1932, to Sept. 30, 1933, water-stage recorder, at same site at datum 1 ft higher. |
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REMARKS.-- Diurnal fluctuation caused by powerplants above station. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 13,000 ft3/s, March 23, 1929, gage height, 11.81 ft, present datum; maximum gage height, 13.05 ft, February 5, 1916, present datum, backwater from ice; minimum daily discharge, 42 ft3/s, August 25 and 26, 1934. |
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REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are fair, and periods of discharge below 800 ft3/s, which are poor. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 1020 | 1540 | 1090 | 1090 | e790 | e630 | 1530 | 1370 | 2410 | 840 | 637 | 449 |
2 | 1370 | 1520 | e1100 | 1100 | e760 | e610 | 1570 | 1930 | 2170 | 862 | 630 | 450 |
3 | 1480 | 1470 | e1100 | e960 | e740 | e610 | 1590 | 2300 | 1860 | 806 | 683 | 396 |
4 | 1740 | 1480 | e1100 | e960 | e730 | e610 | 1590 | 2150 | 1940 | 795 | 682 | 368 |
5 | 1840 | 1470 | e1000 | e980 | e730 | e610 | 1560 | 2520 | 1780 | 858 | 595 | 384 |
6 | 1830 | 1370 | e1000 | e1000 | e730 | e640 | 1470 | 2520 | 1590 | 903 | 601 | 336 |
7 | 1690 | 1000 | e1000 | 1040 | e730 | e650 | 1570 | 2630 | 1500 | 791 | 688 | 352 |
8 | 1940 | 1060 | e1000 | 1090 | e730 | e650 | 1530 | 2600 | 1450 | 995 | 726 | 478 |
9 | 1870 | 1420 | e900 | 1380 | e730 | e640 | 1450 | 3060 | 1500 | 990 | 679 | 559 |
10 | 1800 | 1430 | e900 | e1200 | e730 | e640 | 1470 | 3060 | 1470 | 1250 | 626 | 498 |
11 | 1530 | 1410 | e900 | e1100 | e730 | 733 | 1430 | 2840 | 1190 | 1110 | 610 | 467 |
12 | 1290 | 1380 | e900 | e1000 | e720 | 726 | 1400 | 2940 | 1310 | 1020 | 677 | 430 |
13 | 1310 | 1330 | e870 | e950 | e700 | 721 | 1430 | 3230 | 1320 | 1030 | 714 | 543 |
14 | 1350 | 1350 | e870 | e940 | e700 | 745 | 1360 | 3600 | 1390 | 938 | 723 | 759 |
15 | 1350 | 1440 | e870 | e920 | e700 | 788 | 914 | 3630 | 1410 | 1110 | 646 | 561 |
16 | 1370 | 1390 | e880 | e900 | e700 | 767 | 968 | 3600 | 1400 | 1010 | 528 | 409 |
17 | 1340 | 1400 | e900 | e860 | e700 | 751 | 1020 | 3520 | 1600 | 946 | 538 | 604 |
18 | 1420 | 1400 | e950 | e860 | e700 | 795 | 509 | 3480 | 1580 | 1110 | 544 | 529 |
19 | 1370 | 1320 | e1000 | e850 | e700 | 1070 | 626 | 3400 | 1640 | 1070 | 534 | 489 |
20 | 1360 | 1320 | e1000 | e840 | e710 | 1060 | 851 | 3480 | 1300 | 852 | 465 | 444 |
21 | 1360 | 1320 | e1000 | e840 | e680 | 1320 | 936 | 3370 | 1040 | 1060 | 382 | 667 |
22 | 1430 | 1280 | e1000 | e830 | e590 | 1340 | 1000 | 3330 | 1060 | 1220 | 657 | 626 |
23 | 1440 | 1260 | e1000 | e830 | e560 | 1390 | 1180 | 3420 | 968 | 1150 | 510 | 449 |
24 | 1630 | 1240 | e970 | e830 | e530 | 1340 | 1490 | 3280 | 686 | 1090 | 366 | 515 |
25 | 1330 | 1260 | e970 | e830 | e540 | 1700 | 1480 | 3170 | 844 | 929 | 494 | 558 |
26 | 1220 | 1170 | e990 | e830 | e570 | 1650 | 1700 | 3030 | 764 | 790 | 439 | 474 |
27 | 1350 | e1200 | e1000 | e830 | e600 | 1610 | 1580 | 2960 | 684 | 744 | 335 | 444 |
28 | 1220 | e1100 | e1000 | e820 | e630 | 1670 | 1410 | 2750 | 855 | 761 | 430 | 586 |
29 | 1590 | e1100 | e1100 | e820 | --- | 1610 | 1070 | 2560 | 853 | 715 | 481 | 487 |
30 | 1590 | e1100 | 1160 | e800 | --- | 1580 | 1190 | 2640 | 822 | 668 | 351 | 466 |
31 | 1560 | --- | 1120 | e790 | --- | 1540 | --- | 2610 | --- | 633 | 384 | --- |
TOTAL | 45990 | 39530 | 30640 | 29070 | 19160 | 31196 | 38874 | 90980 | 40386 | 29046 | 17355 | 14777 |
MEAN | 1484 | 1318 | 988 | 938 | 684 | 1006 | 1296 | 2935 | 1346 | 937 | 560 | 493 |
MAX | 1940 | 1540 | 1160 | 1380 | 790 | 1700 | 1700 | 3630 | 2410 | 1250 | 726 | 759 |
MIN | 1020 | 1000 | 870 | 790 | 530 | 610 | 509 | 1370 | 684 | 633 | 335 | 336 |
CFSM | 0.44 | 0.39 | 0.30 | 0.28 | 0.20 | 0.30 | 0.39 | 0.88 | 0.40 | 0.28 | 0.17 | 0.15 |
IN. | 0.51 | 0.44 | 0.34 | 0.32 | 0.21 | 0.35 | 0.43 | 1.01 | 0.45 | 0.32 | 0.19 | 0.16 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1914 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 1400 | 1579 | 1473 | 1311 | 1560 | 3315 | 4076 | 2606 | 1848 | 1434 | 1135 | 1194 |
MAX | 8219 | 5884 | 4395 | 3558 | 5647 | 8958 | 10010 | 7911 | 7452 | 5443 | 5376 | 5088 |
(WY) | 1987 | 1986 | 1986 | 1960 | 1938 | 1918 | 1979 | 1973 | 2000 | 1993 | 1924 | 1938 |
MIN | 254 | 397 | 383 | 275 | 327 | 610 | 1002 | 389 | 314 | 247 | 183 | 212 |
(WY) | 1940 | 1964 | 1940 | 1959 | 1959 | 1940 | 1931 | 1958 | 1934 | 1934 | 1934 | 1939 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1914 - 2003 | |||
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ANNUAL TOTAL | 711448 | 427004 | ||||
ANNUAL MEAN | 1949 | 1170 | 1914 | |||
HIGHEST ANNUAL MEAN | 3925 | 1993 | ||||
LOWEST ANNUAL MEAN | 557 | 1964 | ||||
HIGHEST DAILY MEAN | 4270 | Mar 18 | 3630 | May 15 | 13000 | Mar 23 1929 |
LOWEST DAILY MEAN | 603 | Aug 10 | 335 | Aug 27 | 42 | Aug 25 1934 |
ANNUAL SEVEN-DAY MINIMUM | 720 | Sep 12 | 391 | Sep 1 | 115 | Aug 24 1934 |
MAXIMUM PEAK FLOW | 3680 | May 14 | 13000 | Mar 23 1929 | ||
MAXIMUM PEAK STAGE | 6.52 | May 14 | 13.05 | Feb 5 1916 | ||
ANNUAL RUNOFF (CFSM) | 0.58 | 0.35 | 0.57 | |||
ANNUAL RUNOFF (INCHES) | 7.92 | 4.76 | 7.79 | |||
10 PERCENT EXCEEDS | 3630 | 1850 | 4040 | |||
50 PERCENT EXCEEDS | 1600 | 1000 | 1350 | |||
90 PERCENT EXCEEDS | 784 | 536 | 482 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |