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Hydrograph River at a Glance Download
Mississippi River at Alton Stage (ft)Observed: 17.05 ft at 2:00PM Apr 18, 2024Observed: 17.06 ft at 2:30PM Apr 18, 2024Observed: 17.06 ft at 3:00PM Apr 18, 2024Observed: 17.05 ft at 3:30PM Apr 18, 2024Observed: 17.06 ft at 4:00PM Apr 18, 2024Observed: 17.09 ft at 4:30PM Apr 18, 2024Observed: 17.1 ft at 5:00PM Apr 18, 2024Observed: 17.07 ft at 5:30PM Apr 18, 2024Highest Observation: 17.25 ft at 6:00PM Apr 18, 2024Observed: 17.15 ft at 6:30PM Apr 18, 2024Observed: 17.06 ft at 7:00PM Apr 18, 2024Observed: 17.09 ft at 7:30PM Apr 18, 2024Observed: 17.1 ft at 8:00PM Apr 18, 2024Observed: 17.06 ft at 8:30PM Apr 18, 2024Observed: 17.08 ft at 9:00PM Apr 18, 2024Observed: 17.09 ft at 9:30PM Apr 18, 2024Observed: 17.06 ft at 10:00PM Apr 18, 2024Observed: 17.08 ft at 10:30PM Apr 18, 2024Observed: 17.06 ft at 11:00PM Apr 18, 2024Observed: 17.05 ft at 11:30PM Apr 18, 2024Observed: 17.06 ft at 12:00AM Apr 19, 2024Observed: 17.04 ft at 12:30AM Apr 19, 2024Observed: 17.03 ft at 1:00AM Apr 19, 2024Observed: 17.05 ft at 1:30AM Apr 19, 2024Observed: 17.05 ft at 2:00AM Apr 19, 2024Observed: 17.04 ft at 2:30AM Apr 19, 2024Observed: 17.06 ft at 3:00AM Apr 19, 2024Observed: 17.07 ft at 3:30AM Apr 19, 2024Observed: 17.07 ft at 4:00AM Apr 19, 2024Observed: 17.08 ft at 4:30AM Apr 19, 2024Observed: 17.09 ft at 5:00AM Apr 19, 2024Observed: 17.1 ft at 5:30AM Apr 19, 2024Observed: 17.11 ft at 6:00AM Apr 19, 2024Observed: 17.12 ft at 6:30AM Apr 19, 2024Observed: 17.13 ft at 7:00AM Apr 19, 2024Observed: 17.16 ft at 7:30AM Apr 19, 2024Observed: 16.93 ft at 8:00AM Apr 19, 2024Observed: 16.97 ft at 8:30AM Apr 19, 2024Observed: 16.96 ft at 9:00AM Apr 19, 2024Observed: 16.96 ft at 9:30AM Apr 19, 2024Observed: 16.95 ft at 10:00AM Apr 19, 2024Observed: 16.95 ft at 10:30AM Apr 19, 2024Observed: 16.86 ft at 11:00AM Apr 19, 2024Observed: 16.93 ft at 11:30AM Apr 19, 2024Observed: 16.97 ft at 12:00PM Apr 19, 2024Observed: 16.99 ft at 12:30PM Apr 19, 2024Observed: 16.97 ft at 1:00PM Apr 19, 2024Observed: 17.01 ft at 1:30PM Apr 19, 2024Observed: 16.53 ft at 2:00PM Apr 19, 2024Observed: 16.33 ft at 2:30PM Apr 19, 2024Observed: 16.19 ft at 3:00PM Apr 19, 2024Observed: 16.08 ft at 3:30PM Apr 19, 2024Observed: 15.98 ft at 4:00PM Apr 19, 2024Observed: 15.88 ft at 4:30PM Apr 19, 2024Observed: 15.79 ft at 5:00PM Apr 19, 2024Observed: 15.68 ft at 5:30PM Apr 19, 2024Observed: 15.64 ft at 6:00PM Apr 19, 2024Observed: 15.57 ft at 6:30PM Apr 19, 2024Observed: 15.51 ft at 7:00PM Apr 19, 2024Observed: 15.46 ft at 7:30PM Apr 19, 2024Observed: 15.48 ft at 8:00PM Apr 19, 2024Observed: 15.48 ft at 8:30PM Apr 19, 2024Observed: 15.43 ft at 9:00PM Apr 19, 2024Observed: 15.44 ft at 9:30PM Apr 19, 2024Observed: 15.44 ft at 10:00PM Apr 19, 2024Observed: 15.42 ft at 10:30PM Apr 19, 2024Observed: 15.4 ft at 11:00PM Apr 19, 2024Observed: 15.37 ft at 11:30PM Apr 19, 2024Observed: 15.4 ft at 12:00AM Apr 20, 2024Observed: 15.39 ft at 12:30AM Apr 20, 2024Observed: 15.38 ft at 1:00AM Apr 20, 2024Observed: 15.36 ft at 1:30AM Apr 20, 2024Observed: 15.35 ft at 2:00AM Apr 20, 2024Observed: 15.36 ft at 2:30AM Apr 20, 2024Observed: 15.36 ft at 3:00AM Apr 20, 2024Observed: 15.36 ft at 3:30AM Apr 20, 2024Observed: 15.37 ft at 4:00AM Apr 20, 2024Observed: 15.36 ft at 4:30AM Apr 20, 2024Observed: 15.36 ft at 5:00AM Apr 20, 2024Observed: 15.36 ft at 5:30AM Apr 20, 2024Observed: 15.35 ft at 6:00AM Apr 20, 2024Observed: 15.28 ft at 6:30AM Apr 20, 2024Observed: 15.28 ft at 7:00AM Apr 20, 2024Observed: 15.32 ft at 7:30AM Apr 20, 2024Observed: 15.33 ft at 8:00AM Apr 20, 2024Observed: 15.32 ft at 8:30AM Apr 20, 2024Observed: 15.24 ft at 9:00AM Apr 20, 2024Observed: 15.34 ft at 9:30AM Apr 20, 2024Observed: 15.32 ft at 10:30AM Apr 20, 2024Observed: 15.32 ft at 11:00AM Apr 20, 2024Observed: 15.32 ft at 12:00PM Apr 20, 2024Observed: 15.32 ft at 12:30PM Apr 20, 2024Observed: 15.31 ft at 1:30PM Apr 20, 2024Observed: 15.37 ft at 2:00PM Apr 20, 2024Observed: 15.36 ft at 2:30PM Apr 20, 2024Observed: 15.37 ft at 3:00PM Apr 20, 2024Observed: 15.38 ft at 3:30PM Apr 20, 2024Observed: 15.38 ft at 4:00PM Apr 20, 2024Observed: 15.37 ft at 4:30PM Apr 20, 2024Observed: 15.39 ft at 5:00PM Apr 20, 2024Observed: 15.3 ft at 5:30PM Apr 20, 2024Observed: 15.18 ft at 6:00PM Apr 20, 2024Observed: 15.13 ft at 6:30PM Apr 20, 2024Observed: 15.07 ft at 7:00PM Apr 20, 2024Observed: 15 ft at 7:30PM Apr 20, 2024Observed: 14.96 ft at 8:00PM Apr 20, 2024Observed: 14.87 ft at 8:30PM Apr 20, 2024Observed: 14.95 ft at 9:00PM Apr 20, 2024Observed: 14.92 ft at 9:30PM Apr 20, 2024Observed: 14.9 ft at 10:00PM Apr 20, 2024Observed: 14.86 ft at 10:30PM Apr 20, 2024Observed: 14.85 ft at 11:00PM Apr 20, 2024Observed: 14.83 ft at 11:30PM Apr 20, 2024Observed: 14.8 ft at 12:00AM Apr 21, 2024Observed: 14.79 ft at 12:30AM Apr 21, 2024Observed: 14.77 ft at 1:00AM Apr 21, 2024Observed: 14.77 ft at 1:30AM Apr 21, 2024Observed: 14.77 ft at 2:00AM Apr 21, 2024Observed: 14.78 ft at 2:30AM Apr 21, 2024Observed: 14.77 ft at 3:00AM Apr 21, 2024Observed: 14.79 ft at 3:30AM Apr 21, 2024Observed: 14.78 ft at 4:00AM Apr 21, 2024Observed: 14.79 ft at 4:30AM Apr 21, 2024Observed: 14.76 ft at 5:00AM Apr 21, 2024Observed: 14.77 ft at 5:30AM Apr 21, 2024Observed: 14.84 ft at 6:00AM Apr 21, 2024Observed: 14.83 ft at 6:30AM Apr 21, 2024Observed: 14.85 ft at 7:00AM Apr 21, 2024Observed: 14.86 ft at 7:30AM Apr 21, 2024Observed: 14.87 ft at 8:00AM Apr 21, 2024Observed: 14.87 ft at 8:30AM Apr 21, 2024Observed: 14.84 ft at 9:00AM Apr 21, 2024Observed: 14.87 ft at 9:30AM Apr 21, 2024Observed: 14.88 ft at 10:00AM Apr 21, 2024Observed: 14.89 ft at 10:30AM Apr 21, 2024Observed: 14.92 ft at 11:00AM Apr 21, 2024Observed: 14.91 ft at 11:30AM Apr 21, 2024Observed: 14.91 ft at 12:00PM Apr 21, 2024Observed: 14.93 ft at 12:30PM Apr 21, 2024Observed: 14.91 ft at 1:00PM Apr 21, 2024Observed: 14.92 ft at 1:30PM Apr 21, 2024Observed: 14.92 ft at 2:00PM Apr 21, 2024Observed: 14.91 ft at 2:30PM Apr 21, 2024Observed: 14.93 ft at 3:00PM Apr 21, 2024Observed: 14.93 ft at 3:30PM Apr 21, 2024Observed: 14.92 ft at 4:00PM Apr 21, 2024Observed: 14.94 ft at 4:30PM Apr 21, 2024Observed: 14.93 ft at 5:00PM Apr 21, 2024Observed: 14.92 ft at 5:30PM Apr 21, 2024Observed: 14.9 ft at 6:00PM Apr 21, 2024Observed: 14.89 ft at 6:30PM Apr 21, 2024Observed: 14.88 ft at 7:00PM Apr 21, 2024Observed: 14.87 ft at 7:30PM Apr 21, 2024Observed: 14.94 ft at 8:00PM Apr 21, 2024Observed: 15.04 ft at 8:30PM Apr 21, 2024Observed: 15.08 ft at 9:00PM Apr 21, 2024Observed: 15.19 ft at 9:30PM Apr 21, 2024Observed: 15.22 ft at 10:00PM Apr 21, 2024Observed: 15.25 ft at 10:30PM Apr 21, 2024Observed: 15.28 ft at 11:00PM Apr 21, 2024Observed: 15.29 ft at 11:30PM Apr 21, 2024Observed: 15.31 ft at 12:00AM Apr 22, 2024Observed: 15.32 ft at 12:30AM Apr 22, 2024Observed: 15.32 ft at 1:00AM Apr 22, 2024Observed: 15.31 ft at 1:30AM Apr 22, 2024Observed: 15.31 ft at 2:00AM Apr 22, 2024Observed: 15.25 ft at 2:30AM Apr 22, 2024Observed: 15.3 ft at 3:00AM Apr 22, 2024Observed: 15.27 ft at 3:30AM Apr 22, 2024Observed: 15.27 ft at 4:00AM Apr 22, 2024Observed: 15.27 ft at 4:30AM Apr 22, 2024Observed: 15.24 ft at 5:00AM Apr 22, 2024Observed: 15.27 ft at 5:30AM Apr 22, 2024Observed: 15.28 ft at 6:00AM Apr 22, 2024Observed: 15.29 ft at 6:30AM Apr 22, 2024Observed: 15.31 ft at 7:00AM Apr 22, 2024Observed: 15.29 ft at 7:30AM Apr 22, 2024Observed: 15.29 ft at 8:00AM Apr 22, 2024Observed: 15.29 ft at 8:30AM Apr 22, 2024Observed: 15.29 ft at 9:00AM Apr 22, 2024Observed: 15.3 ft at 9:30AM Apr 22, 2024Observed: 15.29 ft at 10:00AM Apr 22, 2024Observed: 15.3 ft at 10:30AM Apr 22, 2024Observed: 15.32 ft at 11:00AM Apr 22, 2024Observed: 15.28 ft at 11:30AM Apr 22, 2024Observed: 15.27 ft at 12:00PM Apr 22, 2024Observed: 15.27 ft at 12:30PM Apr 22, 2024Observed: 15.38 ft at 1:00PM Apr 22, 2024Observed: 15.39 ft at 1:30PM Apr 22, 2024Observed: 15.5 ft at 2:00PM Apr 22, 2024Observed: 15.65 ft at 2:30PM Apr 22, 2024Observed: 15.71 ft at 3:00PM Apr 22, 2024Observed: 15.79 ft at 3:30PM Apr 22, 2024Observed: 15.87 ft at 4:00PM Apr 22, 2024Observed: 15.97 ft at 4:30PM Apr 22, 2024Observed: 16.04 ft at 5:00PM Apr 22, 2024Observed: 16.13 ft at 5:30PM Apr 22, 2024Observed: 16.18 ft at 6:00PM Apr 22, 2024Observed: 16.18 ft at 6:30PM Apr 22, 2024Observed: 16.29 ft at 7:00PM Apr 22, 2024Observed: 16.27 ft at 7:30PM Apr 22, 2024Observed: 16.18 ft at 8:00PM Apr 22, 2024Observed: 16.15 ft at 8:30PM Apr 22, 2024Observed: 16.06 ft at 9:00PM Apr 22, 2024Observed: 16.13 ft at 9:30PM Apr 22, 2024Observed: 16.14 ft at 10:00PM Apr 22, 2024Observed: 16.12 ft at 10:30PM Apr 22, 2024Observed: 16.13 ft at 11:00PM Apr 22, 2024Observed: 16.13 ft at 11:30PM Apr 22, 2024Observed: 16.13 ft at 12:00AM Apr 23, 2024Observed: 16.13 ft at 12:30AM Apr 23, 2024Observed: 16.14 ft at 1:00AM Apr 23, 2024Observed: 16.14 ft at 1:30AM Apr 23, 2024Observed: 16.14 ft at 2:00AM Apr 23, 2024Observed: 16.14 ft at 2:30AM Apr 23, 2024Observed: 16.17 ft at 3:00AM Apr 23, 2024Observed: 16.16 ft at 3:30AM Apr 23, 2024Observed: 16.16 ft at 4:00AM Apr 23, 2024Observed: 16.16 ft at 4:30AM Apr 23, 2024Observed: 16.17 ft at 5:00AM Apr 23, 2024Observed: 16.17 ft at 5:30AM Apr 23, 2024Observed: 16.18 ft at 6:00AM Apr 23, 2024Observed: 16.13 ft at 6:30AM Apr 23, 2024Observed: 16.13 ft at 7:00AM Apr 23, 2024Observed: 16.12 ft at 7:30AM Apr 23, 2024Observed: 16.08 ft at 8:00AM Apr 23, 2024Observed: 16.07 ft at 8:30AM Apr 23, 2024Observed: 16.06 ft at 9:00AM Apr 23, 2024Observed: 16.03 ft at 9:30AM Apr 23, 2024Observed: 16.03 ft at 10:00AM Apr 23, 2024Observed: 16.03 ft at 10:30AM Apr 23, 2024Observed: 15.91 ft at 11:00AM Apr 23, 2024Observed: 16.02 ft at 11:30AM Apr 23, 2024Observed: 16.01 ft at 12:00PM Apr 23, 2024Observed: 16.02 ft at 12:30PM Apr 23, 2024Observed: 16.03 ft at 1:00PM Apr 23, 2024Observed: 16.04 ft at 1:30PM Apr 23, 2024Observed: 16.06 ft at 2:00PM Apr 23, 2024Observed: 16.08 ft at 2:30PM Apr 23, 2024Observed: 16.08 ft at 3:00PM Apr 23, 2024Observed: 16.1 ft at 3:30PM Apr 23, 2024Observed: 16.1 ft at 4:00PM Apr 23, 2024Observed: 16.1 ft at 4:30PM Apr 23, 2024Observed: 16.1 ft at 5:00PM Apr 23, 2024Observed: 16.11 ft at 5:30PM Apr 23, 2024Observed: 16.11 ft at 6:00PM Apr 23, 2024Observed: 16.11 ft at 6:30PM Apr 23, 2024Observed: 16.12 ft at 7:00PM Apr 23, 2024Observed: 16.12 ft at 7:30PM Apr 23, 2024Observed: 16.13 ft at 8:00PM Apr 23, 2024Observed: 16.12 ft at 8:30PM Apr 23, 2024Observed: 16.14 ft at 9:00PM Apr 23, 2024Observed: 16.16 ft at 9:30PM Apr 23, 2024Observed: 16.12 ft at 10:00PM Apr 23, 2024Observed: 16.11 ft at 10:30PM Apr 23, 2024Observed: 16.13 ft at 11:00PM Apr 23, 2024Observed: 16.16 ft at 11:30PM Apr 23, 2024Observed: 16.16 ft at 12:00AM Apr 24, 2024Observed: 16.16 ft at 12:30AM Apr 24, 2024Observed: 16.16 ft at 1:00AM Apr 24, 2024Observed: 16.16 ft at 1:30AM Apr 24, 2024Observed: 16.17 ft at 2:00AM Apr 24, 2024Observed: 16.17 ft at 2:30AM Apr 24, 2024Observed: 16.17 ft at 3:00AM Apr 24, 2024Observed: 16.19 ft at 3:30AM Apr 24, 2024Observed: 16.18 ft at 4:00AM Apr 24, 2024Observed: 16.07 ft at 4:30AM Apr 24, 2024Observed: 16.03 ft at 5:00AM Apr 24, 2024Observed: 15.98 ft at 5:30AM Apr 24, 2024Observed: 15.95 ft at 6:00AM Apr 24, 2024Observed: 15.93 ft at 6:30AM Apr 24, 2024Observed: 15.91 ft at 7:00AM Apr 24, 2024Observed: 15.89 ft at 7:30AM Apr 24, 2024Observed: 15.87 ft at 8:00AM Apr 24, 2024Observed: 15.91 ft at 8:30AM Apr 24, 2024Observed: 15.9 ft at 9:00AM Apr 24, 2024Observed: 15.96 ft at 9:30AM Apr 24, 2024Observed: 15.97 ft at 10:00AM Apr 24, 2024Observed: 15.99 ft at 10:30AM Apr 24, 2024Observed: 16.01 ft at 11:00AM Apr 24, 2024Observed: 16.02 ft at 11:30AM Apr 24, 2024Observed: 16.07 ft at 12:00PM Apr 24, 2024Observed: 16.06 ft at 12:30PM Apr 24, 2024Observed: 16.06 ft at 1:00PM Apr 24, 2024Observed: 16.07 ft at 1:30PM Apr 24, 2024Observed: 16.05 ft at 2:00PM Apr 24, 2024Observed: 16.03 ft at 2:30PM Apr 24, 2024Observed: 16.01 ft at 3:00PM Apr 24, 2024Observed: 15.99 ft at 3:30PM Apr 24, 2024Observed: 15.97 ft at 4:00PM Apr 24, 2024Observed: 15.98 ft at 4:30PM Apr 24, 2024Observed: 15.95 ft at 5:00PM Apr 24, 2024Observed: 15.94 ft at 5:30PM Apr 24, 2024Observed: 15.93 ft at 6:00PM Apr 24, 2024Observed: 15.86 ft at 6:30PM Apr 24, 2024Observed: 15.91 ft at 7:00PM Apr 24, 2024Observed: 15.91 ft at 7:30PM Apr 24, 2024Observed: 15.89 ft at 8:00PM Apr 24, 2024Observed: 15.89 ft at 8:30PM Apr 24, 2024Observed: 15.88 ft at 9:00PM Apr 24, 2024Observed: 15.85 ft at 9:30PM Apr 24, 2024Observed: 15.87 ft at 10:00PM Apr 24, 2024Observed: 15.85 ft at 10:30PM Apr 24, 2024Observed: 15.85 ft at 11:00PM Apr 24, 2024Observed: 15.8 ft at 11:30PM Apr 24, 2024Observed: 15.84 ft at 12:00AM Apr 25, 2024Observed: 15.82 ft at 12:30AM Apr 25, 2024Observed: 15.81 ft at 1:00AM Apr 25, 2024Observed: 15.81 ft at 1:30AM Apr 25, 2024Observed: 15.79 ft at 2:00AM Apr 25, 2024Observed: 15.78 ft at 2:30AM Apr 25, 2024Observed: 15.79 ft at 3:00AM Apr 25, 2024Observed: 15.76 ft at 3:30AM Apr 25, 2024Observed: 15.74 ft at 4:00AM Apr 25, 2024Observed: 15.75 ft at 4:30AM Apr 25, 2024Observed: 15.74 ft at 5:00AM Apr 25, 2024Observed: 15.76 ft at 5:30AM Apr 25, 2024Observed: 15.77 ft at 6:00AM Apr 25, 2024Observed: 15.82 ft at 6:30AM Apr 25, 2024Observed: 15.79 ft at 7:00AM Apr 25, 2024Observed: 15.79 ft at 7:30AM Apr 25, 2024Observed: 15.8 ft at 8:00AM Apr 25, 2024Observed: 15.79 ft at 8:30AM Apr 25, 2024Observed: 15.79 ft at 9:00AM Apr 25, 2024Observed: 15.8 ft at 9:30AM Apr 25, 2024Observed: 15.82 ft at 10:00AM Apr 25, 2024Observed: 15.82 ft at 10:30AM Apr 25, 2024Observed: 15.81 ft at 11:00AM Apr 25, 2024Observed: 15.8 ft at 11:30AM Apr 25, 2024Observed: 15.8 ft at 12:00PM Apr 25, 2024Observed: 15.79 ft at 12:30PM Apr 25, 2024Observed: 15.78 ft at 1:00PM Apr 25, 2024USGS--Water Resources of the United StatesALOI2(plotting HGIRG) Graph Created (1:41PM Apr 25, 2024)ObservedLatest observed value: 15.78 ft at 1:00 PM CDT 25-Apr-2024. Flood Stage is 21 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.

NOTE: Forecasts for the Mississippi River at Alton are issued as needed during times of high water, but are not routinely available.

Return to Area Map
Upstream Gauge - at Grafton Upstream Gauge Downstream Gauge Downstream Gauge - at Mel Price (Alton) Lock and Dam
Flood Categories (in feet)
Major Flood Stage: 31
Moderate Flood Stage: 24
Flood Stage: 21
Action Stage: 20
Low Stage (in feet): -9999

Historic Crests
(1) 39.55 ft on 08/01/1993
(2) 35.30 ft on 06/09/2019
(3) 31.94 ft on 01/01/2016
(4) 31.60 ft on 05/07/2019
(5) 31.43 ft on 05/22/1995
(6) 31.27 ft on 06/04/2013
(7) 31.02 ft on 05/06/2017
(8) 29.78 ft on 06/29/2008
(9) 29.11 ft on 06/30/2015
(10) 28.77 ft on 04/03/2019
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.70 ft on 03/20/2021
(2) 21.69 ft on 06/01/2020
(3) 20.30 ft on 03/29/2020
(4) 21.86 ft on 10/13/2019
(5) 35.30 ft on 06/09/2019
(6) 31.60 ft on 05/07/2019
(7) 28.77 ft on 04/03/2019
(8) 23.71 ft on 10/17/2018
(9) 31.02 ft on 05/06/2017
(10) 31.94 ft on 01/01/2016
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 11/07/1948
(2) 0.10 ft on 01/15/2003
(3) 3.20 ft on 01/10/1980

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:16
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
39 Near this height, floodwaters will reach the floor of the Lincoln Shields gazebo in West Alton, Missouri.
38.7 Near this height U.S. Highway 67 will be completely closed.
36.7 The railroad between Wood River and Alton begins flooding near this height.
32 At this height, the waterpark playground will become inundated.
31.2 Near this height, the southbound lanes of U.S. Highway 67 will begin flooding, forcing the detour of southbound traffic onto the northbound lanes.
30.9 Near this height, water will begin flowing over Riverlands Way between Highway 67 and Mel Price Locks and Dam. This road is a part of the Consolidated North County levee, so this is the point when water begins gradually flowing onto the protected farmland and farm homes behind the levee.
30.8 The intersection of West Broadway (Illinois 100) and U.S. Highway 67 will begin flooding near this height.
29.7 Floodwater begins damaging property in Elsah, Illinois and in Portage des Sioux, Missouri near this height.
29.2 Near this height, floodwater should begin to impact the base of the Ardent Mills grain bins.
28.2 At this height, water will cover the sidewalk near the waterpark playground.
28 Near this height, the flood wall around the Argosy Casino will overtop, flooding the casino parking lot.
27.2 At this height, Bloch Marine Service at Harbor Point Yacht Club begins flooding.
26.6 Route 100 at Alton closes near this height.
25.5 Highway 100 will begin flooding at Clifton Terrace Street within 2 feet of this height.
24.6 Missouri Highway 94 from Alta Villa Road to Feltes Drive will be closed near this height.
24.5 Highway 100 begins flooding at the Clifton Terrace Street intersection near this height.
24.2 The Wood River South Levee flood gate is closed near this height.
23.3 Near this height, the outer road between Riverlands Way and the Lincoln Shields Access Road will close due to flooding.
23.2 Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club near this height.
22.2 Missouri Highway 94 between Portage Des Sioux and West Alton begins flooding. Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club.
21.7 At this level, Highway 94 and the east end of Harbor Point Road off of Missouri Highway 94 north of West Alton begin flooding. Also, the access road the Lincoln Shields recreation area off of U.S. Highway 367 just west of the Clark bridge begins flooding.
20.7 During open river conditions (Mel Price gates all open), Alta Villa Road off of Highway 94 begins flooding and is closed.
19.7 During open river conditions (Mel Price gates are open), Dresser Island Drive begins flooding near this level.
Photos
(1) Gaging shelter at the downtown Alton gage, looking upstream on September 17, 2021.
(2) Wire weight gage at the downtown Alton gage, the site of the former tailwater gage for L&D 26.
(3) Downtown Alton at the intersection of Broadway and U.S. 67 on June 4, 2019
About This Location Collapse

Latitude: 38.887222° N, Longitude: 90.183889° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 21 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(gauge height = flood stage)		 Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
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Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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