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LOCATION.-- Lat 41°53'18", long 87°36'27" (NAD of 1927), in NE1/4 SE1/4 sec.10, T.39 N., R.14 E., Cook County, Hydrologic Unit 04060200, on the lakeside of the downstream left guidewall, approximately 75 ft west of the riverside gates of the Chicago Lock. |
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DRAINAGE AREA.-- Indeterminate. |
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PERIOD OF RECORD.-- |
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STAGE: August 1997 to current year. |
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GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City Datum). |
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REMARKS.-- Gage provides stage data to determine Illinois' diversion of Lake Michigan water. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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STAGE: Maximum gage height, 3.84 ft, May 31, 1998; minimum, -3.79 ft., Feb 11, 2002, exaggerated due to wave action. |
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EXTREMES FOR CURRENT YEAR.-- Maximum gage height, 0.40 ft, Oct. 2; minimum, -3.72 ft, Dec. 18, instantaneous annual extremes are exaggerated due to wave action. |
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| Gage height, feet, 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 | -0.77 | -1.18 | -1.81 | -1.44 | -1.88 | -2.07 | -1.86 | -1.32 | -1.22 | -1.04 | -1.00 | -1.56 |
| 2 | -0.40 | -1.13 | -1.12 | -1.19 | -1.79 | -1.89 | -1.55 | -1.31 | -1.22 | -1.11 | -0.96 | -1.30 |
| 3 | -0.39 | -1.11 | -1.39 | -1.28 | -1.66 | -2.31 | -1.36 | -1.37 | -1.03 | -1.18 | -0.92 | -1.36 |
| 4 | -0.77 | -1.06 | -1.31 | -1.70 | -1.73 | -1.98 | -1.12 | -1.54 | -1.04 | -1.13 | -0.85 | -1.31 |
| 5 | -0.77 | -1.14 | -1.40 | -1.46 | -2.06 | -1.86 | -1.35 | -1.33 | -1.21 | -1.20 | -0.97 | -1.43 |
| 6 | -1.03 | -1.02 | -1.85 | -1.50 | -1.83 | -2.11 | -1.69 | -1.20 | -1.16 | -1.09 | -0.98 | -1.52 |
| 7 | -0.86 | -1.63 | -1.87 | -2.01 | -1.94 | -2.28 | -1.73 | -1.27 | -1.09 | -1.04 | -0.90 | -1.38 |
| 8 | -0.98 | -1.78 | -1.58 | -1.93 | -2.31 | -1.84 | -1.44 | -1.23 | -1.11 | -1.10 | -0.78 | -1.21 |
| 9 | -0.65 | -1.61 | -1.90 | -1.69 | -2.16 | -2.22 | -1.72 | -1.38 | -1.17 | -0.96 | -0.87 | -1.23 |
| 10 | -0.62 | -0.98 | -1.86 | -1.87 | -2.03 | -2.19 | -1.75 | -1.19 | -1.25 | -0.95 | -0.98 | -1.36 |
| 11 | -0.54 | -1.04 | -1.53 | -2.05 | -2.15 | -2.42 | -1.69 | -1.93 | -0.90 | -0.92 | -0.75 | -1.51 |
| 12 | -0.71 | -1.17 | -1.79 | -2.36 | -2.21 | -2.01 | -1.67 | -1.41 | -0.86 | -1.21 | -0.74 | -1.63 |
| 13 | -0.89 | -1.31 | -1.39 | -2.02 | -2.09 | -1.92 | -1.70 | -1.44 | -0.93 | -1.02 | -0.82 | -1.44 |
| 14 | -1.12 | -1.02 | -1.58 | -1.90 | -1.82 | -2.25 | -2.09 | -1.22 | -1.04 | -1.00 | -0.87 | -1.42 |
| 15 | -0.70 | -0.97 | -1.35 | -1.86 | -1.41 | -2.11 | -2.28 | -1.09 | -0.94 | -1.10 | -0.99 | -1.48 |
| 16 | -0.76 | -0.83 | -1.60 | -1.76 | -1.37 | -2.15 | -1.27 | -1.11 | -0.89 | -1.15 | -0.97 | -1.58 |
| 17 | -0.80 | -0.97 | -1.96 | -1.68 | -1.67 | -1.98 | -1.14 | -0.98 | -0.95 | -1.02 | -0.88 | -1.53 |
| 18 | -1.19 | -1.57 | -2.05 | -2.07 | -2.20 | -1.72 | -1.21 | -1.03 | -0.99 | -0.85 | -1.06 | -1.45 |
| 19 | -0.82 | -1.26 | -1.46 | -2.22 | -2.10 | -1.66 | -1.59 | -1.07 | -0.90 | -1.09 | -1.16 | -1.45 |
| 20 | -0.90 | -1.19 | -1.82 | -2.06 | -2.25 | -1.79 | -1.80 | -1.14 | -1.01 | -1.10 | -1.29 | -1.73 |
| 21 | -0.99 | -0.85 | -2.01 | -1.83 | -1.98 | -2.01 | -1.59 | -1.21 | -1.10 | -0.85 | -1.30 | -1.55 |
| 22 | -0.49 | -1.09 | -2.19 | -1.70 | -1.30 | -2.01 | -1.66 | -1.05 | -1.13 | -0.78 | -1.19 | -1.40 |
| 23 | -0.65 | -1.49 | -1.99 | -1.85 | -1.78 | -2.05 | -1.63 | -1.13 | -1.10 | -0.81 | -1.17 | -1.70 |
| 24 | -1.09 | -1.41 | -1.62 | -2.04 | -1.88 | -2.03 | -1.50 | -1.14 | -1.13 | -1.00 | -1.38 | -1.93 |
| 25 | -1.04 | -1.23 | -1.43 | -2.05 | -1.94 | -2.04 | -1.29 | -1.11 | -1.24 | -1.25 | -1.28 | -1.77 |
| 26 | -0.80 | -1.06 | -1.83 | -1.86 | -2.02 | -1.99 | -1.51 | -1.10 | -1.22 | -1.52 | -1.25 | -1.93 |
| 27 | -0.93 | -1.14 | -1.80 | -2.18 | -2.01 | -2.01 | -1.70 | -1.17 | -1.35 | -1.09 | -1.09 | -1.63 |
| 28 | -0.80 | -1.61 | -1.79 | -1.93 | -1.98 | -2.06 | -1.60 | -1.13 | -1.04 | -0.99 | -1.35 | -1.58 |
| 29 | -0.96 | -1.96 | -1.55 | -1.75 | --- | -1.86 | -1.49 | -1.17 | -1.08 | -1.07 | -1.11 | -1.70 |
| 30 | -0.81 | -1.37 | -1.42 | -2.22 | --- | -1.99 | -1.32 | -1.25 | -1.10 | -1.11 | -1.34 | -1.70 |
| 31 | -0.93 | --- | -1.49 | -1.98 | --- | -2.01 | --- | -0.95 | --- | -1.01 | -1.39 | --- |
| MEAN | -0.81 | -1.24 | -1.67 | -1.85 | -1.91 | -2.03 | -1.58 | -1.22 | -1.08 | -1.06 | -1.05 | -1.53 |
| MAX | -0.39 | -0.83 | -1.12 | -1.19 | -1.30 | -1.66 | -1.12 | -0.95 | -0.86 | -0.78 | -0.74 | -1.21 |
| MIN | -1.19 | -1.96 | -2.19 | -2.36 | -2.31 | -2.42 | -2.28 | -1.93 | -1.35 | -1.52 | -1.39 | -1.93 |
| CAL YR 2002 | MEAN -0.82 | MAX 0.21 | MIN -2.35 |
| WTR YR 2003 | MEAN -1.42 | MAX -0.39 | MIN -2.42 |
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Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |