Station list     Available data
ILLINOIS RIVER BASIN


05576000       SOUTH FORK SANGAMON RIVER NEAR ROCHESTER, IL

 

LOCATION.-- Lat 39°44'32", long 89°34'02" (NAD of 1927), in NE1/4NW1/4 sec.20, T.15 N., R.4 W., Sangamon County, Hydrologic Unit 07130007, on right bank at city of Springfield dam, 100 ft downstream from Horse Creek, 1.7 mi southwest of Rochester, and at mile 7.4. Auxiliary gage 1.2 miles downstream.

 

DRAINAGE AREA.-- 867 mi2.

 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

 

DISCHARGE: July 1949 to current year.

 

STAGE: Water years 1994 to current year.

 

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

 

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 511.30 ft above NGVD of 1929. Prior to Oct. 1, 1964, water-stage recorder, and Oct. 1, 1964, to Apr. 12, 1966, non-recording gage, at site 1.8 mi downstream at same datum. Auxiliary water-stage recorder at site 1.2 mi downstream. Prior to May 19, 1950, auxiliary non-recording gage at site 6.2 mi downstream. May 19, 1950 to Apr. 29, 1975, auxiliary non-recording gage at site 1.2 mi downstream.

 

REMARKS.-- Beginning Apr. 14, 1955, diversion for Springfield's public-water supply periodically occurs upstream from the station and upstream from the dam between the confluence of Horse Creek and the gage. The water is diverted to Lake Springfield. Occasional regulation occurs due to operation of the gate at the diversion dam. Pumpage from Lake Taylorville into stream generally occurs during the fall upstream from the gage.

 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 20,300 ft3/s, Apr. 14, 1994, gage height, 32.40 ft; maximum gage height, 33.65 ft, May 13, 2002, discharge 14,100 ft3/s; no flow Nov. 4-6, 1985, Sept. 9, 1987, and for many days in 1988-90, 92, and 2000.

 

REMARKS FOR CURRENT YEAR.-- Records fair except those for Nov. 19 to Dec. 12, Apr. 6-12, June 16-24 and estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
125 34 681 937 e310 616 2530 344 e1230 87   3.8e13   
225 37 565 1170 e300 583 2220 328 e982 48   4.4e5.5
327 53 476 1310 e295 531 1750 316 735 20   4.7e4.5
425 63 420 e1610 e290 501 1340 331 584 106   4.0e4.1
523 58 390 2590 e280 1580 1030 344 507 132   4.23.9
 
621 85 372 2770 e270 2640 782 350 474 156   4.33.8
721 173 353 2860 e265 2750 659 325 497 116   3.54.3
820 173 335 3300 e260 2980 639 302 446 121   3.34.4
921 168 327 3660 e250 3100 581 283 315 139   3.93.5
1026 166 325 3710 e240 2970 482 257 267 122   3.73.1
 
1122 166 303 3350 e235 2460 433 251 340 148   3.53.1
1220 165 291 e2430 e230 e1730 385 264 395 233   4.22.9
1328 164 287 e1430 e225 1090 397 310 456 139   4.63.0
1475 162 263 958 e220 774 365 691 541 108   4.32.8
1568 164 253 791 e215 642 329 2320 607 101   3.92.2
 
1670 158 251 695 e215 565 320 3160 812 102   4.21.9
1789 e440 230 645 223 517 315 3570 943 89   4.61.8
18122 1270 224 803 226 492 294 4230 1250 66   4.31.8
19114 2330 200 1040 291 458 272 4940 1250 48   4.11.8
2094 2060 142 1080 623 416 266 5110 1140 21   3.92.1
 
2182 1960 118 1080 1100 373 262 4450 920 7.43.82.3
2268 1770 111 1030 1200 336 236 3750 594 6.13.82.2
2357 1820 228 911 1190 313 341 2990 371 5.73.71.8
2455 2020 946 765 1270 314 350 3080 309 5.03.61.8
2549 2030 1170 634 1260 325 426 3290 238 4.742   1.8
 
2640 e1810 1130 551 1110 452 547 2900 193 5.1e60   1.8
2734 e1530 1100 e480 942 e1160 486 2360 154 4.9e80   1.7
2831 1290 1090 e420 803 1790 420 1960 128 4.9e94   1.7
2931 1060 939 e360 686 2400 372 1750 115 4.5e100   2.1
3033 840 771 e330 --- 2560 353 1600 101 4.6e70   2.0
 
3134 --- 789 e320 --- 2600 --- e1430 --- 4.6e30   ---   

TOTAL145024219150804402015024400181918257586168942159.5572.392.7
MEAN46.880748614205181291639185856369.718.53.09
MAX1222330117037101270310025305110125023310013
MIN20341113202153132362511014.53.31.7
CFSM0.050.930.561.640.601.490.742.140.650.080.020.00
IN.0.061.040.651.890.641.720.822.470.720.090.020.00

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2004, BY WATER YEAR (WY)
MEAN195266526589882102110461063887370232140
MAX274828464546378842733669399164893600305330462876
(WY)197019861968195019821978199420021974195719581993
MIN1.060.670.190.753.040.052.8017.93.201.741.021.13
(WY)198919771977199020002000200019541988195419641987

SUMMARY STATISTICSFOR 2003 CALENDAR YEARFOR 2004 WATER YEARWATER YEARS 1949 - 2004
ANNUAL TOTAL136923.37      236297.5        
ANNUAL MEAN375           646           600           
HIGHEST ANNUAL MEAN1461           2002
LOWEST ANNUAL MEAN26.3        1954
HIGHEST DAILY MEAN5620               May 115110               May 2019000           Apr 14 1994
LOWEST DAILY MEAN0.87   A    Apr 31.7            Sep 27,280.00      B
ANNUAL SEVEN-DAY MINIMUM2.0            Feb 101.8            Sep 230.00      Jun 9 1988
MAXIMUM PEAK FLOW5530        C    May 2020300        DApr 14 1994
MAXIMUM PEAK STAGE23.21   E    May 2033.65   FMay 13 2002
INSTANTANEOUS LOW FLOW1.6            G
ANNUAL RUNOFF (CFSM)0.433    0.745    0.692    
ANNUAL RUNOFF (INCHES)5.87      10.14      9.40      
10 PERCENT EXCEEDS1080           1980           1620           
50 PERCENT EXCEEDS114           294           165           
90 PERCENT EXCEEDS3.0        4.0        4.8        

A - Due to regulation.

B - Nov. 4-6, 1985; Sept. 9, 1987; many days in 1988-90, 1992, and 2000.

C - Gage height, 23.12 ft.

D - Gage height, 32.40 ft.

E - Discharge, 5240 ft3/s.

F - Discharge, 14100 ft3/s.

G - Sept. 17, 24, 27, 28.



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Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

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