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, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 3000 | 3330 | 2440 | e2100 | e1700 | e3000 | 3160 | 3580 | 2120 | 1930 | 764 | 725 |
2 | 2910 | 3390 | 2450 | e2000 | e1700 | e2900 | 3240 | 3540 | 2020 | 1640 | 766 | 747 |
3 | 2720 | 3350 | 2440 | e2000 | e1700 | e2800 | 3120 | 3420 | 2140 | 1580 | 792 | 678 |
4 | 2640 | 3320 | 2450 | e1900 | e1700 | e2800 | 3040 | 3430 | 2700 | 1310 | 806 | 813 |
5 | 2540 | 3230 | 2390 | e1900 | e1700 | e2800 | 2960 | 3350 | 2870 | 1240 | 832 | 821 |
6 | 2420 | 3090 | 2290 | e1800 | e1700 | e2800 | 2870 | 3320 | 3050 | 1190 | 884 | 816 |
7 | 2310 | 2900 | 2440 | e1700 | 1720 | e2800 | 2790 | 3340 | 3090 | 1150 | 793 | 784 |
8 | 2220 | 2810 | 2470 | e1700 | 1680 | e2900 | 3080 | 3360 | 3210 | 1060 | 742 | 769 |
9 | 2050 | 2750 | 2410 | e1700 | 1710 | 3310 | 3570 | 3210 | 3360 | 754 | 647 | 772 |
10 | 2110 | 2640 | 2320 | 1630 | 1830 | 2870 | 3640 | 3060 | 3400 | 1070 | 603 | 800 |
11 | 2100 | 2600 | 2350 | 1520 | 1740 | 3500 | 3720 | 3280 | 3480 | 969 | 662 | 812 |
12 | 2130 | 2500 | 2310 | 1650 | 1740 | 3780 | 4100 | 3380 | 3610 | 914 | 741 | 779 |
13 | 2140 | 2440 | 2380 | 1520 | 1740 | 4020 | 4250 | 3350 | 3690 | 681 | 878 | 715 |
14 | 2080 | 2430 | 2360 | 1650 | 1830 | 4220 | 4240 | 3200 | 3700 | 720 | 916 | 694 |
15 | 1980 | 2430 | 2350 | 1670 | 1940 | 4140 | 4200 | 3110 | 3690 | 769 | 1210 | 748 |
16 | 2140 | 2600 | 2380 | 1700 | 1960 | 4190 | 4150 | 3050 | 3650 | 794 | 1110 | 749 |
17 | 2110 | 2620 | 2420 | 1670 | 1950 | 4140 | 4130 | 3220 | 3580 | 707 | 633 | 676 |
18 | 2120 | 2530 | 2420 | e1600 | 1940 | 4270 | 4110 | 3180 | 3570 | 731 | 622 | 682 |
19 | 2160 | 2460 | 2440 | e1600 | 2040 | 4100 | 4120 | 3110 | 3550 | 849 | 786 | 802 |
20 | 2090 | 2400 | 2420 | e1600 | 2230 | 3930 | 4160 | 3090 | 3400 | 752 | 754 | 989 |
21 | 2140 | 2280 | 2600 | e1600 | 2330 | 3930 | 4130 | 2950 | 3360 | 737 | 783 | 837 |
22 | 2260 | 2340 | 2600 | e1600 | 2430 | 3740 | 3960 | 2770 | 3270 | 809 | 1040 | 854 |
23 | 2610 | 2300 | 2500 | e1600 | 2560 | 3660 | 3830 | 2620 | 3070 | 888 | 1430 | 814 |
24 | 3180 | 2470 | 2410 | e1600 | 2740 | 3750 | 3780 | 2580 | 2910 | 937 | 1380 | 805 |
25 | 2660 | 2400 | 2310 | 1620 | 2940 | 3900 | 3600 | 2640 | 2740 | 923 | 1320 | 884 |
26 | 2790 | 2420 | e2300 | 1630 | 3090 | 3630 | 3650 | 2440 | 2630 | 833 | 1200 | 879 |
27 | 3250 | 2500 | e2200 | 1630 | e3100 | 3440 | 3740 | 2380 | 2450 | 784 | 930 | 907 |
28 | 3300 | 2460 | e2200 | 1650 | e3000 | 3350 | 3770 | 2450 | 2380 | 715 | 969 | 889 |
29 | 3380 | 2520 | e2100 | 1650 | --- | 3340 | 3580 | 2360 | 2260 | 862 | 731 | 1040 |
30 | 3550 | 2540 | e2100 | 1640 | --- | 3230 | 3430 | 2270 | 2120 | 821 | 784 | 1040 |
31 | 3470 | --- | e2100 | e1700 | --- | 3150 | --- | 2200 | --- | 794 | 757 | --- |
TOTAL | 78560 | 80050 | 73350 | 52530 | 58440 | 108390 | 110120 | 93240 | 91070 | 29913 | 27265 | 24320 |
MEAN | 2534 | 2668 | 2366 | 1695 | 2087 | 3496 | 3671 | 3008 | 3036 | 964.9 | 879.5 | 810.7 |
MAX | 3550 | 3390 | 2600 | 2100 | 3100 | 4270 | 4250 | 3580 | 3700 | 1930 | 1430 | 1040 |
MIN | 1980 | 2280 | 2100 | 1520 | 1680 | 2800 | 2790 | 2200 | 2020 | 681 | 603 | 676 |
CFSM | 0.76 | 0.80 | 0.71 | 0.51 | 0.62 | 1.05 | 1.10 | 0.90 | 0.91 | 0.29 | 0.26 | 0.24 |
IN. | 0.87 | 0.89 | 0.82 | 0.59 | 0.65 | 1.21 | 1.23 | 1.04 | 1.01 | 0.33 | 0.30 | 0.27 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1914 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 1399 | 1582 | 1478 | 1315 | 1570 | 3341 | 4107 | 2602 | 1854 | 1439 | 1142 | 1201 |
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 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1914 - 2002 | |||
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ANNUAL TOTAL | 1003818 | 827248 | ||||
ANNUAL MEAN | 2750 | 2266 | 1923 | |||
HIGHEST ANNUAL MEAN | 3925 | 1993 | ||||
LOWEST ANNUAL MEAN | 557 | 1964 | ||||
HIGHEST DAILY MEAN | 5370 | Apr 18 | 4270 | Mar 18 | 13000 | Mar 23 1929 |
LOWEST DAILY MEAN | 555 | Jul 31 | 603 | Aug 10 | 42 | Aug 25 1934 |
ANNUAL SEVEN-DAY MINIMUM | 975 | Aug 14 | 720 | Sep 12 | 115 | Aug 24 1934 |
MAXIMUM PEAK FLOW | 4440 | Mar 18 | 13000 | Mar 23 1929 | ||
MAXIMUM PEAK STAGE | 7.19 | Mar 18 | 13.05 | Feb 5 1916 | ||
ANNUAL RUNOFF (CFSM) | 0.82 | 0.68 | 0.58 | |||
ANNUAL RUNOFF (INCHES) | 11.18 | 9.21 | 7.82 | |||
10 PERCENT EXCEEDS | 4330 | 3630 | 4060 | |||
50 PERCENT EXCEEDS | 2600 | 2360 | 1360 | |||
90 PERCENT EXCEEDS | 1400 | 784 | 481 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |