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Live/Water/Illinois/Mississippi River at Alton Il

Mississippi River at Alton Il

A gauge on the Mississippi River in Madison County, Illinois. Its stage was 18.68 ft as of Oct 16, 12:00 AM CDT.

Gauge ALOI2Madison County, IllinoisEvery gauge in Illinois

Stage now
18.68 ftreported Oct 16, 12:00 AM CDT
24 hour change
Rose 0.18 ftsince Oct 15, 12:00 AM
Rank
895of 1,393 in Illinois, Oct 16
Elevation
423 ftabove sea level
County
Madison County
Position
38.8872° N, 90.1839° W
Record since
2009

Water level

Mississippi River at Alton Il

Stage is the height of the water's surface above the gauge's own fixed zero, in feet, not the depth of the water. Every point drawn is a reading the gauge sent, at the time it sent it.

Water level, 24 hours at Mississippi River at Alton Il: the water from 18.43 to 18.85 feet of stage, the latest 18.68 feet.WATER LEVEL, 24 HOURSFTHIGH 18.85 FT, OCT 15, 12:30 PM · LOW 18.43 FT, OCT 15, 3:00 AM18.418.618.819.03 AM6 AM9 AM12 PM3 PM6 PM9 PMOct 1618.68
Latest
18.68 ftOct 16, 12:00 AM
Highest
18.85 ftOct 15, 12:30 PM
Lowest
18.43 ftOct 15, 3:00 AM
Range
0.42 fthighest less lowest
Change
Rose 0.15 ftsince Oct 15, 12:30 AM
Readings
45
The readings these charts were drawn from, as a table
TimeStage ft
Oct 16, 12:00 AM18.68
Oct 15, 11:30 PM18.69
Oct 15, 11:00 PM18.72
Oct 15, 10:30 PM18.73
Oct 15, 10:00 PM18.70
Oct 15, 9:30 PM18.65
Oct 15, 9:00 PM18.64
Oct 15, 8:30 PM18.67
Oct 15, 8:00 PM18.68
Oct 15, 7:30 PM18.71
Oct 15, 7:00 PM18.72
Oct 15, 6:30 PM18.76
Oct 15, 6:00 PM18.75
Oct 15, 5:00 PM18.77
Oct 15, 4:30 PM18.76
Oct 15, 3:30 PM18.80
Oct 15, 3:00 PM18.78
Oct 15, 2:30 PM18.76
Oct 15, 2:00 PM18.75
Oct 15, 1:30 PM18.78
Oct 15, 1:00 PM18.81
Oct 15, 12:30 PM18.85
Oct 15, 11:30 AM18.73
Oct 15, 11:00 AM18.73
Oct 15, 10:30 AM18.74
Oct 15, 10:00 AM18.70
Oct 15, 9:30 AM18.66
Oct 15, 9:00 AM18.62
Oct 15, 8:30 AM18.67
Oct 15, 8:00 AM18.68
Oct 15, 7:30 AM18.68
Oct 15, 7:00 AM18.64
Oct 15, 6:30 AM18.64
Oct 15, 6:00 AM18.63
Oct 15, 5:30 AM18.65
Oct 15, 5:00 AM18.61
Oct 15, 4:30 AM18.62
Oct 15, 4:00 AM18.62
Oct 15, 3:30 AM18.59
Oct 15, 3:00 AM18.43
Oct 15, 2:30 AM18.59
Oct 15, 2:00 AM18.59
Oct 15, 1:30 AM18.56
Oct 15, 1:00 AM18.55
Oct 15, 12:30 AM18.53
Water level, 7 days at Mississippi River at Alton Il: the water from 14.27 to 19.15 feet of stage, the latest 18.68 feet.WATER LEVEL, 7 DAYSFTHIGH 19.15 FT, OCT 13, 8:00 AM · LOW 14.27 FT, OCT 9, 12:30 PM14161820Sat 10Sun 11Mon 12Tue 13Wed 14Thu 15Fri 1618.68
Latest
18.68 ftOct 16, 12:00 AM
Highest
19.15 ftOct 13, 8:00 AM
Lowest
14.27 ftOct 9, 12:30 PM
Range
4.88 fthighest less lowest
Change
Rose 3.93 ftsince Oct 9, 12:30 AM
Readings
331
The readings these charts were drawn from, as a table
TimeStage ft
Oct 16, 12:00 AM18.68
Oct 15, 11:30 PM18.69
Oct 15, 10:30 PM18.73
Oct 15, 9:30 PM18.65
Oct 15, 8:30 PM18.67
Oct 15, 7:30 PM18.71
Oct 15, 6:30 PM18.76
Oct 15, 5:00 PM18.77
Oct 15, 4:30 PM18.76
Oct 15, 3:30 PM18.80
Oct 15, 2:30 PM18.76
Oct 15, 1:30 PM18.78
Oct 15, 12:30 PM18.85
Oct 15, 11:30 AM18.73
Oct 15, 10:30 AM18.74
Oct 15, 9:30 AM18.66
Oct 15, 8:30 AM18.67
Oct 15, 7:30 AM18.68
Oct 15, 6:30 AM18.64
Oct 15, 5:30 AM18.65
Oct 15, 4:30 AM18.62
Oct 15, 3:30 AM18.59
Oct 15, 2:30 AM18.59
Oct 15, 1:30 AM18.56
Oct 15, 12:30 AM18.53
Oct 14, 11:30 PM18.48
Oct 14, 10:30 PM18.43
Oct 14, 9:30 PM18.38
Oct 14, 8:30 PM18.30
Oct 14, 7:30 PM18.26
Oct 14, 6:30 PM18.15
Oct 14, 5:30 PM18.09
Oct 14, 4:30 PM18.02
Oct 14, 3:30 PM17.92
Oct 14, 2:30 PM17.79
Oct 14, 1:30 PM17.61
Oct 14, 12:30 PM17.39
Oct 14, 11:30 AM17.00
Oct 14, 10:30 AM17.01
Oct 14, 9:30 AM16.99
Oct 14, 8:30 AM17.02
Oct 14, 7:30 AM17.12
Oct 14, 6:30 AM17.19
Oct 14, 5:30 AM17.24
Oct 14, 4:30 AM17.28
Oct 14, 3:30 AM17.33
Oct 14, 2:30 AM17.44
Oct 14, 1:30 AM17.51
Oct 14, 12:30 AM17.52
Oct 13, 11:30 PM17.65
Oct 13, 10:30 PM17.75
Oct 13, 9:30 PM17.81
Oct 13, 8:30 PM17.89
Oct 13, 7:30 PM17.98
Oct 13, 6:30 PM18.08
Oct 13, 5:30 PM18.19
Oct 13, 4:30 PM18.31
Oct 13, 3:30 PM18.51
Oct 13, 2:30 PM18.56
Oct 13, 1:00 PM18.62
Oct 13, 12:30 PM18.66
Oct 13, 11:30 AM18.75
Oct 13, 10:30 AM18.79
Oct 13, 9:30 AM18.89
Oct 13, 8:30 AM19.15
Oct 13, 7:30 AM19.11
Oct 13, 6:30 AM19.12
Oct 13, 5:30 AM19.12
Oct 13, 4:30 AM19.08
Oct 13, 3:30 AM19.04
Oct 13, 2:30 AM19.00
Oct 13, 1:30 AM18.97
Oct 13, 12:30 AM18.90
Oct 12, 11:30 PM18.91
Oct 12, 10:30 PM18.76
Oct 12, 9:30 PM18.91
Oct 12, 8:30 PM18.76
Oct 12, 7:30 PM18.58
Oct 12, 6:30 PM18.39
Oct 12, 5:30 PM18.17
Oct 12, 4:30 PM17.87
Oct 12, 3:30 PM17.57
Oct 12, 2:30 PM17.14
Oct 12, 1:30 PM17.01
Oct 12, 12:30 PM16.90
Oct 12, 11:30 AM16.75
Oct 12, 10:30 AM16.60
Oct 12, 9:30 AM16.35
Oct 12, 8:30 AM15.83
Oct 12, 7:30 AM15.79
Oct 12, 6:30 AM15.80
Oct 12, 5:30 AM15.87
Oct 12, 4:30 AM15.89
Oct 12, 3:30 AM15.93
Oct 12, 2:30 AM15.97
Oct 12, 1:30 AM16.01
Oct 12, 12:30 AM16.04
Oct 11, 11:30 PM16.08
Oct 11, 10:30 PM16.10
Oct 11, 9:30 PM16.12
Oct 11, 8:30 PM16.16
Oct 11, 7:30 PM16.18
Oct 11, 6:30 PM16.20
Oct 11, 5:30 PM16.24
Oct 11, 4:30 PM16.25
Oct 11, 3:30 PM16.24
Oct 11, 2:30 PM16.22
Oct 11, 1:30 PM16.23
Oct 11, 12:30 PM16.17
Oct 11, 11:30 AM16.09
Oct 11, 10:30 AM16.13
Oct 11, 9:30 AM16.17
Oct 11, 8:30 AM16.18
Oct 11, 7:30 AM16.21
Oct 11, 6:30 AM16.22
Oct 11, 5:30 AM16.23
Oct 11, 4:30 AM16.27
Oct 11, 3:30 AM16.27
Oct 11, 2:30 AM16.25
Oct 11, 1:30 AM16.25
Oct 11, 12:30 AM16.24
Oct 10, 11:30 PM16.21
Oct 10, 10:30 PM16.22
Oct 10, 9:30 PM16.10
Oct 10, 8:30 PM16.11
Oct 10, 7:30 PM16.09
Oct 10, 6:30 PM15.95
Oct 10, 5:30 PM15.78
Oct 10, 4:30 PM15.79
Oct 10, 3:30 PM15.77
Oct 10, 2:30 PM15.72
Oct 10, 1:30 PM15.68
Oct 10, 12:30 PM15.64
Oct 10, 11:30 AM15.53
Oct 10, 10:30 AM15.40
Oct 10, 9:30 AM15.18
Oct 10, 8:30 AM14.70
Oct 10, 7:30 AM14.79
Oct 10, 6:30 AM14.83
Oct 10, 5:30 AM14.88
Oct 10, 4:30 AM14.93
Oct 10, 3:30 AM14.99
Oct 10, 2:30 AM15.01
Oct 10, 1:30 AM15.08
Oct 10, 12:30 AM15.12
Oct 9, 11:30 PM15.18
Oct 9, 10:30 PM15.19
Oct 9, 9:30 PM15.22
Oct 9, 8:30 PM15.31
Oct 9, 7:30 PM15.28
Oct 9, 6:30 PM15.29
Oct 9, 5:30 PM15.25
Oct 9, 4:30 PM15.24
Oct 9, 3:30 PM15.17
Oct 9, 2:30 PM15.08
Oct 9, 1:30 PM14.89
Oct 9, 12:30 PM14.27
Oct 9, 11:30 AM14.42
Oct 9, 10:30 AM14.71
Oct 9, 9:30 AM14.69
Oct 9, 8:30 AM14.58
Oct 9, 7:30 AM14.39
Oct 9, 6:30 AM14.45
Oct 9, 5:30 AM14.47
Oct 9, 4:30 AM14.52
Oct 9, 3:30 AM14.59
Oct 9, 2:30 AM14.64
Oct 9, 1:30 AM14.69
Oct 9, 12:30 AM14.75
Water level, 30 days at Mississippi River at Alton Il: the water from 13.84 to 19.64 feet of stage, the latest 18.68 feet.WATER LEVEL, 30 DAYSFTHIGH 19.64 FT, SEP 16, 4:00 AM · LOW 13.84 FT, SEP 29, 6:30 AM121416182022Sep 16Sep 21Sep 26Oct 1Oct 6Oct 1118.68
Latest
18.68 ftOct 16, 12:00 AM
Highest
19.64 ftSep 16, 4:00 AM
Lowest
13.84 ftSep 29, 6:30 AM
Range
5.80 fthighest less lowest
Change
Fell 0.88 ftsince Sep 16, 12:30 AM
Readings
1,411
The readings these charts were drawn from, as a table
DayHigh ftLow ftAverage ftLast ftReadings
Oct 1618.6818.6818.6818.681
Oct 1518.8518.4318.6818.6945
Oct 1418.4816.9417.6318.4848
Oct 1319.1517.6518.5917.6547
Oct 1218.9215.7717.0518.9147
Oct 1116.2816.0816.2016.0848
Oct 1016.2214.7015.4716.2148
Oct 915.3114.2714.8415.1848
Oct 814.9714.1714.6314.7748
Oct 715.3514.6514.9714.6546
Oct 615.6415.4015.5415.4148
Oct 515.4414.9515.1715.4048
Oct 416.7614.9915.8514.9948
Oct 318.2216.1217.1016.1648
Oct 217.0415.4315.9817.0447
Oct 115.5214.7815.1915.4947
Sep 3015.2114.1714.7715.1647
Sep 2915.2013.8414.7414.8748
Sep 2814.6214.2314.4314.3248
Sep 2714.8114.6214.7514.6248
Sep 2614.7014.3714.5914.6847
Sep 2514.8514.3114.5514.3848
Sep 2415.4914.6515.0414.6746
Sep 2315.1714.5414.7615.1748
Sep 2217.0814.9316.3014.9346
Sep 2117.1916.3016.7616.3046
Sep 2018.2617.1917.8817.1943
Sep 1918.8418.5218.7418.5243
Sep 1819.3818.8519.1318.8548
Sep 1719.3919.1119.3119.1148
Sep 1619.6419.3919.5519.3945

How it reports

Rank
895of 1,393 in Illinois, Oct 16
Schedule
every 30 minon the hour's :00 and :30
Reports received, 24 hours
45 of 4893.7% of its schedule
Reports received, 7 days
331 of 33698.5% of its schedule
Longest silence, 7 days
1 hourfrom Oct 12, 10:30 AM
Latest report
Oct 15, 11:59 PMlocal time
Time to reach Storm Station
17 min9 in 10 within 17 min
Against its reference, 30 days
+5.8 °Fwarmer than the airport station KALN, 8.2 miles away, on average over 593 readings; typical difference 7.2 °F; also compared with 2 other reference stations

From Storm Station's own record of every report it heard from this station.

Against its reference: each temperature this station reports is compared with the nearest airport or climate reference station that reported within half an hour, up to 15 miles away. The figure is its reading less the reference's, on average, as both were reported; the typical difference is the root mean square. The difference in height is shown where both heights are known.

Its schedule is one report every 30 min, 48 in 24 hours. Two reports in the same 30 min count as one received.

Ranking Statistics

247 score93.0of 100

Illinois median
95.9the median score of 1,393 stations
Scoring higher
893stations in Illinois
Sharing its score
2ranks 894 to 895
Points deducted
7.04.7 accuracy, 1.3 arrival, 0.5 forecast check, 0.5 reports received
Counted at the median
Forecast checknot measured at this station; Illinois median 94.7
Next above
BKCI2rank 894; ahead on reports received 100% against 98.5%
Next below
414129087575201rank 896; behind on 247 score 93.0 against 92.9

Equal scores are ordered by the share of scheduled reports received, then the reports due in the week (the longer record first), then the median arrival, then the longest silence.

  1. Reports receivedweight 3598.534.5 of 35 pointsIllinois median 99.1331 of 336 scheduled reports received in 7 days
  2. Arrivalweight 1086.88.7 of 10 pointsIllinois median 96.3half its reports arrived within 17 min
  3. Continuityweight 10100.010.0 of 10 pointsIllinois median 100.0longest silence 60 min, on a schedule of one report every 30 min
  4. Accuracyweight 2076.715.3 of 20 pointsIllinois median 100.0its temperature against the airport station KALN, 8.2 miles away, over 247 readings: typical difference 3.8 °F beyond a steady offset of +5.2 °F
  5. Instrument checksweight 15100.015.0 of 15 pointsIllinois median 100.00 of 247 readings failed their check against its reference station
  6. Forecast checkweight 10-9.5 of 10 points, at the medianIllinois median 94.7-

The score is the weighted mean of its six parts, from the last 7 days. How a station is ranked sets out each part.

How each part is scored
Reports received
Full marks for every scheduled report received, none for none, in proportion between
Arrival
Full marks for a median arrival within 10 min, none at 60 min
Continuity
Full marks for a longest silence of 3 reports or less (1.5 h), none for 72 (36 h)
Accuracy
Full marks within 2.3 °F of its reference, typically, none beyond 8.8 °F
Instrument checks
Full marks for no reading failed, none for 5 per cent or more
Forecast check
Full marks within 2 °F of the forecast on average, none at 8 °F

Near Mississippi River at Alton Il

How to read a gauge

A gauge measures the height of the water where it stands, its stage, in feet above a fixed mark at that gauge. Two gauges' stages are not comparable: each is measured from its own mark, and a reservoir's is often its height above sea level.

The stage shown is the latest the gauge reported, with the time it reported it. Storm Station hears each gauge on its own schedule and ranks it among its state's stations by its 247 score, how reliably it reports and how its readings hold up: that is its 247 rank.