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USGS Daily Statistics for Illinois

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 05533000 FLAG CREEK NEAR WILLOW SPRINGS, IL


Cook County, Illinois
Hydrologic Unit Code 07120004
Latitude  41°44'20.2", Longitude  87°53'48.7" NAD83
Drainage area 16.5  square miles
Contributing drainage area 16.5  square miles
Gage datum 606.02 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1950-10-01 -> 2024-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 22 19 34 39 48 30 25 15 24 16 24 25
2 20 22 27 41 35 33 35 19 16 17 23 25
3 21 20 30 38 33 24 26 26 17 31 20 27
4 27 21 49 36 28 20 18 26 18 20 22 20
5 23 20 42 34 29 24 19 21 16 19 24 22
6 18 20 30 43 28 19 19 20 16 19 21 19
7 17 22 28 31 32 22 18 17 20 15 16 22
8 21 22 38 33 27 28 17 19 16 16 15 22
9 18 25 37 46 41 34 17 16 22 15 21 20
10 19 22 46 34 44 31 18 23 18 27 22 20
11 25 21 38 35 45 31 18 22 21 25 21 23
12 27 20 35 39 46 26 22 17 19 19 19 24
13 27 20 40 34 37 37 28 18 28 21 18 20
14 24 20 35 37 39 34 23 20 37 26 19 25
15 21 19 32 46 35 30 21 17 22 22 21 26
16 18 21 31 39 28 28 19 21 16 18 17 19
17 22 31 31 39 41 23 19 27 19 21 18 17
18 20 26 35 50 30 21 37 23 18 20 24 16
19 21 28 38 37 26 22 29 19 19 17 22 16
20 23 43 34 42 22 20 30 22 15 15 18 18
21 20 45 29 36 27 26 27 23 16 13 19 21
22 27 42 28 36 29 26 22 30 18 20 17 21
23 28 40 31 33 25 25 25 23 17 22 21 21
24 23 35 28 27 24 22 34 22 20 19 18 23
25 23 28 33 34 29 24 20 18 22 23 18 29
26 23 27 27 29 31 31 17 31 25 23 21 21
27 22 35 33 35 27 21 19 28 20 22 34 33
28 19 28 38 45 35 20 19 23 19 16 36 28
29 21 19 36 47 35 19 20 20 21 15 25 24
30 22   40 50 28 24 19 17 15 25 24 29
31 18   40   27   15 16   29   26