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Hydrograph River at a Glance Download
Mississippi River at Mel Price (Alton) Lock and Dam Tailwater (ft)Observed: 4.76 ft at 3:00AM Mar 14, 2024Observed: 4.7 ft at 3:30AM Mar 14, 2024Observed: 4.72 ft at 4:00AM Mar 14, 2024Observed: 4.69 ft at 4:30AM Mar 14, 2024Observed: 4.65 ft at 5:00AM Mar 14, 2024Observed: 4.55 ft at 5:30AM Mar 14, 2024Observed: 4.55 ft at 6:00AM Mar 14, 2024Observed: 4.56 ft at 6:30AM Mar 14, 2024Observed: 4.5 ft at 7:00AM Mar 14, 2024Observed: 4.46 ft at 7:30AM Mar 14, 2024Observed: 4.52 ft at 8:00AM Mar 14, 2024Observed: 4.5 ft at 8:30AM Mar 14, 2024Observed: 4.45 ft at 9:00AM Mar 14, 2024Observed: 4.3 ft at 9:30AM Mar 14, 2024Observed: 4.28 ft at 10:00AM Mar 14, 2024Observed: 4.27 ft at 10:30AM Mar 14, 2024Observed: 4.24 ft at 11:00AM Mar 14, 2024Observed: 4.21 ft at 11:30AM Mar 14, 2024Observed: 4.14 ft at 12:00PM Mar 14, 2024Observed: 4.16 ft at 12:30PM Mar 14, 2024Observed: 4.16 ft at 1:00PM Mar 14, 2024Observed: 4.15 ft at 1:30PM Mar 14, 2024Observed: 4.1 ft at 2:00PM Mar 14, 2024Observed: 4.08 ft at 2:30PM Mar 14, 2024Observed: 4.11 ft at 3:00PM Mar 14, 2024Observed: 4.22 ft at 3:30PM Mar 14, 2024Observed: 4.26 ft at 4:00PM Mar 14, 2024Observed: 4.3 ft at 4:30PM Mar 14, 2024Observed: 4.44 ft at 5:00PM Mar 14, 2024Observed: 4.71 ft at 5:30PM Mar 14, 2024Observed: 4.78 ft at 6:00PM Mar 14, 2024Observed: 4.87 ft at 6:30PM Mar 14, 2024Observed: 4.96 ft at 7:00PM Mar 14, 2024Observed: 5.04 ft at 7:30PM Mar 14, 2024Observed: 5.1 ft at 8:00PM Mar 14, 2024Observed: 5.14 ft at 8:30PM Mar 14, 2024Observed: 5.16 ft at 9:00PM Mar 14, 2024Observed: 5.15 ft at 9:30PM Mar 14, 2024Observed: 5.23 ft at 10:00PM Mar 14, 2024Observed: 5.19 ft at 10:30PM Mar 14, 2024Observed: 5.22 ft at 11:00PM Mar 14, 2024Observed: 5.28 ft at 11:30PM Mar 14, 2024Observed: 5.23 ft at 12:00AM Mar 15, 2024Observed: 5.29 ft at 12:30AM Mar 15, 2024Observed: 5.27 ft at 1:00AM Mar 15, 2024Observed: 5.22 ft at 1:30AM Mar 15, 2024Observed: 5.32 ft at 2:00AM Mar 15, 2024Observed: 5.26 ft at 2:30AM Mar 15, 2024Observed: 5.31 ft at 3:00AM Mar 15, 2024Observed: 5.47 ft at 3:30AM Mar 15, 2024Observed: 5.43 ft at 4:00AM Mar 15, 2024Observed: 5.46 ft at 4:30AM Mar 15, 2024Observed: 5.6 ft at 5:00AM Mar 15, 2024Observed: 5.73 ft at 5:30AM Mar 15, 2024Observed: 5.78 ft at 6:00AM Mar 15, 2024Observed: 5.83 ft at 6:30AM Mar 15, 2024Observed: 5.86 ft at 7:00AM Mar 15, 2024Observed: 5.92 ft at 7:30AM Mar 15, 2024Observed: 5.97 ft at 8:00AM Mar 15, 2024Observed: 6.15 ft at 8:30AM Mar 15, 2024Observed: 6.18 ft at 9:00AM Mar 15, 2024Observed: 6.46 ft at 9:30AM Mar 15, 2024Observed: 6.66 ft at 10:00AM Mar 15, 2024Observed: 6.74 ft at 10:30AM Mar 15, 2024Observed: 6.82 ft at 11:00AM Mar 15, 2024Observed: 6.9 ft at 11:30AM Mar 15, 2024Observed: 6.95 ft at 12:00PM Mar 15, 2024Observed: 7.3 ft at 12:30PM Mar 15, 2024Observed: 7.45 ft at 1:00PM Mar 15, 2024Observed: 7.56 ft at 1:30PM Mar 15, 2024Observed: 7.66 ft at 2:00PM Mar 15, 2024Observed: 7.71 ft at 2:30PM Mar 15, 2024Observed: 7.76 ft at 3:00PM Mar 15, 2024Observed: 7.79 ft at 3:30PM Mar 15, 2024Observed: 7.81 ft at 4:00PM Mar 15, 2024Observed: 7.8 ft at 4:30PM Mar 15, 2024Observed: 7.83 ft at 5:00PM Mar 15, 2024Observed: 7.83 ft at 5:30PM Mar 15, 2024Observed: 7.81 ft at 6:00PM Mar 15, 2024Observed: 7.87 ft at 6:30PM Mar 15, 2024Observed: 7.86 ft at 7:00PM Mar 15, 2024Observed: 7.92 ft at 7:30PM Mar 15, 2024Observed: 7.84 ft at 8:00PM Mar 15, 2024Observed: 7.89 ft at 8:30PM Mar 15, 2024Observed: 7.9 ft at 9:00PM Mar 15, 2024Observed: 7.89 ft at 9:30PM Mar 15, 2024Observed: 7.88 ft at 10:00PM Mar 15, 2024Observed: 7.92 ft at 10:30PM Mar 15, 2024Observed: 7.92 ft at 11:00PM Mar 15, 2024Observed: 7.9 ft at 11:30PM Mar 15, 2024Observed: 7.94 ft at 12:00AM Mar 16, 2024Observed: 7.91 ft at 12:30AM Mar 16, 2024Observed: 7.94 ft at 1:00AM Mar 16, 2024Observed: 7.93 ft at 1:30AM Mar 16, 2024Observed: 7.9 ft at 2:00AM Mar 16, 2024Observed: 7.96 ft at 2:30AM Mar 16, 2024Observed: 7.92 ft at 3:00AM Mar 16, 2024Observed: 7.92 ft at 3:30AM Mar 16, 2024Observed: 7.91 ft at 4:00AM Mar 16, 2024Observed: 7.9 ft at 4:30AM Mar 16, 2024Observed: 7.92 ft at 5:00AM Mar 16, 2024Observed: 7.9 ft at 5:30AM Mar 16, 2024Observed: 7.93 ft at 6:00AM Mar 16, 2024Observed: 7.92 ft at 6:30AM Mar 16, 2024Observed: 7.92 ft at 7:00AM Mar 16, 2024Observed: 7.91 ft at 7:30AM Mar 16, 2024Observed: 7.91 ft at 8:00AM Mar 16, 2024Observed: 7.91 ft at 9:00AM Mar 16, 2024Highest Observation: 7.98 ft at 9:30AM Mar 16, 2024Observed: 7.92 ft at 10:00AM Mar 16, 2024Observed: 7.97 ft at 10:30AM Mar 16, 2024Observed: 7.94 ft at 11:00AM Mar 16, 2024Observed: 7.96 ft at 11:30AM Mar 16, 2024Observed: 7.73 ft at 12:00PM Mar 16, 2024Observed: 7.59 ft at 12:30PM Mar 16, 2024Observed: 7.52 ft at 1:00PM Mar 16, 2024Observed: 7.32 ft at 1:30PM Mar 16, 2024Observed: 7.07 ft at 2:00PM Mar 16, 2024Observed: 6.97 ft at 2:30PM Mar 16, 2024Observed: 6.85 ft at 3:00PM Mar 16, 2024Observed: 6.82 ft at 3:30PM Mar 16, 2024Observed: 6.8 ft at 4:00PM Mar 16, 2024Observed: 6.94 ft at 4:30PM Mar 16, 2024Observed: 6.91 ft at 5:00PM Mar 16, 2024Observed: 6.94 ft at 5:30PM Mar 16, 2024Observed: 7.01 ft at 6:00PM Mar 16, 2024Observed: 7.06 ft at 6:30PM Mar 16, 2024Observed: 7.05 ft at 7:00PM Mar 16, 2024Observed: 7.03 ft at 7:30PM Mar 16, 2024Observed: 7.02 ft at 8:00PM Mar 16, 2024Observed: 7.05 ft at 8:30PM Mar 16, 2024Observed: 7.05 ft at 9:00PM Mar 16, 2024Observed: 6.91 ft at 9:30PM Mar 16, 2024Observed: 6.86 ft at 10:00PM Mar 16, 2024Observed: 6.79 ft at 10:30PM Mar 16, 2024Observed: 6.69 ft at 11:00PM Mar 16, 2024Observed: 6.57 ft at 11:30PM Mar 16, 2024Observed: 6.52 ft at 12:00AM Mar 17, 2024Observed: 6.49 ft at 12:30AM Mar 17, 2024Observed: 6.47 ft at 1:00AM Mar 17, 2024Observed: 6.44 ft at 1:30AM Mar 17, 2024Observed: 6.34 ft at 2:00AM Mar 17, 2024Observed: 6.28 ft at 2:30AM Mar 17, 2024Observed: 6.24 ft at 3:00AM Mar 17, 2024Observed: 6.2 ft at 3:30AM Mar 17, 2024Observed: 6.15 ft at 4:00AM Mar 17, 2024Observed: 6.16 ft at 4:30AM Mar 17, 2024Observed: 6.14 ft at 5:00AM Mar 17, 2024Observed: 6.09 ft at 5:30AM Mar 17, 2024Observed: 6.03 ft at 6:00AM Mar 17, 2024Observed: 6.03 ft at 6:30AM Mar 17, 2024Observed: 6.07 ft at 7:00AM Mar 17, 2024Observed: 6.03 ft at 7:30AM Mar 17, 2024Observed: 6 ft at 8:00AM Mar 17, 2024Observed: 6.02 ft at 8:30AM Mar 17, 2024Observed: 5.99 ft at 9:00AM Mar 17, 2024Observed: 6.03 ft at 9:30AM Mar 17, 2024Observed: 6.07 ft at 10:00AM Mar 17, 2024Observed: 6.06 ft at 10:30AM Mar 17, 2024Observed: 6.08 ft at 11:00AM Mar 17, 2024Observed: 6.19 ft at 11:30AM Mar 17, 2024Observed: 6.12 ft at 12:00PM Mar 17, 2024Observed: 6.14 ft at 12:30PM Mar 17, 2024Observed: 6.14 ft at 1:00PM Mar 17, 2024Observed: 6.22 ft at 1:30PM Mar 17, 2024Observed: 6.18 ft at 2:00PM Mar 17, 2024Observed: 6.16 ft at 2:30PM Mar 17, 2024Observed: 6.16 ft at 3:00PM Mar 17, 2024Observed: 6.16 ft at 3:30PM Mar 17, 2024Observed: 6.19 ft at 4:00PM Mar 17, 2024Observed: 6.16 ft at 4:30PM Mar 17, 2024Observed: 6.14 ft at 5:00PM Mar 17, 2024Observed: 6.15 ft at 5:30PM Mar 17, 2024Observed: 6.14 ft at 6:00PM Mar 17, 2024Observed: 6.18 ft at 6:30PM Mar 17, 2024Observed: 6.26 ft at 7:00PM Mar 17, 2024Observed: 6.27 ft at 7:30PM Mar 17, 2024Observed: 6.33 ft at 8:00PM Mar 17, 2024Observed: 6.34 ft at 8:30PM Mar 17, 2024Observed: 6.35 ft at 9:00PM Mar 17, 2024Observed: 6.36 ft at 9:30PM Mar 17, 2024Observed: 6.38 ft at 10:00PM Mar 17, 2024Observed: 6.37 ft at 10:30PM Mar 17, 2024Observed: 6.4 ft at 11:00PM Mar 17, 2024Observed: 6.43 ft at 11:30PM Mar 17, 2024Observed: 6.4 ft at 12:00AM Mar 18, 2024Observed: 6.41 ft at 12:30AM Mar 18, 2024Observed: 6.45 ft at 1:00AM Mar 18, 2024Observed: 6.45 ft at 1:30AM Mar 18, 2024Observed: 6.44 ft at 2:00AM Mar 18, 2024Observed: 6.38 ft at 2:30AM Mar 18, 2024Observed: 6.31 ft at 3:00AM Mar 18, 2024Observed: 6.19 ft at 3:30AM Mar 18, 2024Observed: 6.21 ft at 4:00AM Mar 18, 2024Observed: 6.15 ft at 4:30AM Mar 18, 2024Observed: 6.11 ft at 5:00AM Mar 18, 2024Observed: 5.99 ft at 5:30AM Mar 18, 2024Observed: 5.93 ft at 6:00AM Mar 18, 2024Observed: 5.9 ft at 6:30AM Mar 18, 2024Observed: 5.96 ft at 7:00AM Mar 18, 2024Observed: 5.9 ft at 7:30AM Mar 18, 2024Observed: 5.84 ft at 8:00AM Mar 18, 2024Observed: 5.89 ft at 8:30AM Mar 18, 2024Observed: 5.88 ft at 9:00AM Mar 18, 2024Observed: 5.91 ft at 9:30AM Mar 18, 2024Observed: 5.88 ft at 10:00AM Mar 18, 2024Observed: 5.88 ft at 10:30AM Mar 18, 2024Observed: 5.9 ft at 11:00AM Mar 18, 2024Observed: 5.91 ft at 11:30AM Mar 18, 2024Observed: 5.92 ft at 12:00PM Mar 18, 2024Observed: 5.93 ft at 12:30PM Mar 18, 2024Observed: 5.95 ft at 1:00PM Mar 18, 2024Observed: 5.96 ft at 1:30PM Mar 18, 2024Observed: 5.99 ft at 2:00PM Mar 18, 2024Observed: 5.98 ft at 2:30PM Mar 18, 2024Observed: 5.99 ft at 3:00PM Mar 18, 2024Observed: 6.03 ft at 3:30PM Mar 18, 2024Observed: 6.1 ft at 4:00PM Mar 18, 2024Observed: 6.21 ft at 4:30PM Mar 18, 2024Observed: 6.17 ft at 5:00PM Mar 18, 2024Observed: 6.23 ft at 5:30PM Mar 18, 2024Observed: 6.22 ft at 6:00PM Mar 18, 2024Observed: 6.29 ft at 6:30PM Mar 18, 2024Observed: 6.28 ft at 7:00PM Mar 18, 2024Observed: 6.28 ft at 7:30PM Mar 18, 2024Observed: 6.29 ft at 8:00PM Mar 18, 2024Observed: 6.32 ft at 8:30PM Mar 18, 2024Observed: 6.35 ft at 9:00PM Mar 18, 2024Observed: 6.35 ft at 9:30PM Mar 18, 2024Observed: 6.35 ft at 10:00PM Mar 18, 2024Observed: 6.44 ft at 10:30PM Mar 18, 2024Observed: 6.42 ft at 11:00PM Mar 18, 2024Observed: 6.48 ft at 11:30PM Mar 18, 2024Observed: 6.43 ft at 12:00AM Mar 19, 2024Observed: 6.46 ft at 12:30AM Mar 19, 2024Observed: 6.5 ft at 1:00AM Mar 19, 2024Observed: 6.56 ft at 1:30AM Mar 19, 2024Observed: 6.52 ft at 2:00AM Mar 19, 2024Highest Forecast: 6.1 ft 7:00AM Mar 19, 2024Forecast: 5.9 ft 1:00PM Mar 19, 2024Forecast: 5.7 ft 7:00PM Mar 19, 2024Forecast: 5.5 ft 1:00AM Mar 20, 2024Forecast: 5.3 ft 7:00AM Mar 20, 2024Forecast: 5.1 ft 1:00PM Mar 20, 2024Forecast: 5 ft 7:00PM Mar 20, 2024Forecast: 5 ft 1:00AM Mar 21, 2024Forecast: 4.9 ft 7:00AM Mar 21, 2024Forecast: 4.9 ft 1:00PM Mar 21, 2024Forecast: 4.9 ft 7:00PM Mar 21, 2024Forecast: 4.8 ft 1:00AM Mar 22, 2024Forecast: 4.8 ft 7:00AM Mar 22, 2024Forecast: 4.7 ft 1:00PM Mar 22, 2024Forecast: 4.7 ft 7:00PM Mar 22, 2024Forecast: 4.6 ft 1:00AM Mar 23, 2024Forecast: 4.6 ft 7:00AM Mar 23, 2024Forecast: 4.5 ft 1:00PM Mar 23, 2024Forecast: 4.5 ft 7:00PM Mar 23, 2024Forecast: 4.4 ft 1:00AM Mar 24, 2024Forecast: 4.4 ft 7:00AM Mar 24, 2024Forecast: 4.4 ft 1:00PM Mar 24, 2024Forecast: 4.4 ft 7:00PM Mar 24, 2024Forecast: 4.4 ft 1:00AM Mar 25, 2024Forecast: 4.4 ft 7:00AM Mar 25, 2024Forecast: 4.4 ft 1:00PM Mar 25, 2024Forecast: 4.4 ft 7:00PM Mar 25, 2024Forecast: 4.4 ft 1:00AM Mar 26, 2024Forecast: 4.4 ft 7:00AM Mar 26, 2024Forecast: 4.4 ft 1:00PM Mar 26, 2024Forecast: 4.4 ft 7:00PM Mar 26, 2024Forecast: 4.4 ft 1:00AM Mar 27, 2024Forecast: 4.4 ft 7:00AM Mar 27, 2024Forecast: 4.3 ft 1:00PM Mar 27, 2024Forecast: 4.3 ft 7:00PM Mar 27, 2024Forecast: 4.3 ft 1:00AM Mar 28, 2024Forecast: 4.3 ft 7:00AM Mar 28, 2024Forecast: 4.3 ft 1:00PM Mar 28, 2024Forecast: 4.2 ft 7:00PM Mar 28, 2024Forecast: 4.2 ft 1:00AM Mar 29, 2024Forecast: 4.2 ft 7:00AM Mar 29, 2024Forecast: 4.2 ft 1:00PM Mar 29, 2024Forecast: 4.1 ft 7:00PM Mar 29, 2024Forecast: 4.1 ft 1:00AM Mar 30, 2024Forecast: 4.1 ft 7:00AM Mar 30, 2024Forecast: 4 ft 1:00PM Mar 30, 2024Forecast: 4 ft 7:00PM Mar 30, 2024Forecast: 3.9 ft 1:00AM Mar 31, 2024Forecast: 3.9 ft 7:00AM Mar 31, 2024Forecast: 3.8 ft 1:00PM Mar 31, 2024Forecast: 3.7 ft 7:00PM Mar 31, 2024Forecast: 3.6 ft 1:00AM Apr 01, 2024Forecast: 3.5 ft 7:00AM Apr 01, 2024Forecast: 3.4 ft 1:00PM Apr 01, 2024Forecast: 3.3 ft 7:00PM Apr 01, 2024USGS--Water Resources of the United StatesALNI2(plotting HTIRG) Graph Created (2:40AM Mar 19, 2024)ObservedForecast (issued 9:01PM Mar 18)Latest observed value: 6.52 ft at 2:00 AM CDT 19-Mar-2024. Flood Stage is 21 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NAVD88
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

NOTE: For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.

NOTE: Forecasts for the Mississippi River at Mel Price (Alton) Lock and Dam are issued routinely year-round.

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Upstream Gauge - at Alton Upstream Gauge Downstream Gauge Downstream Gauge - at St. Louis
Flood Categories (in feet)
Major Flood Stage: 34
Moderate Flood Stage: 29
Flood Stage: 21
Action Stage: 19
Low Stage (in feet): -9999

Historic Crests
(1) 42.72 ft on 08/01/1993
(2) 39.01 ft on 06/09/2019
(3) 36.90 ft on 06/18/1844
(4) 36.89 ft on 04/28/1973
(5) 35.80 ft on 01/01/2016
(6) 35.10 ft on 05/22/1995
(7) 34.86 ft on 05/06/2017
(8) 34.38 ft on 06/04/2013
(9) 34.20 ft on 10/09/1986
(10) 33.21 ft on 05/01/1983
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23.17 ft on 06/28/2021
(2) 22.90 ft on 04/14/2021
(3) 25.04 ft on 03/20/2021
(4) 25.14 ft on 06/01/2020
(5) 22.16 ft on 05/19/2020
(6) 22.32 ft on 04/30/2020
(7) 23.72 ft on 03/25/2020
(8) 23.33 ft on 01/13/2020
(9) 21.55 ft on 11/02/2019
(10) 21.17 ft on 11/01/2019
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) 0.73 ft on 01/16/2003
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:14
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
42.7 This is the RECORD FLOOD LEVEL that was reached on August 1 1993.
42 Near this height U.S. Highway 67 will be completely closed. (MoDOT)
40 Railroad tracks from Wood River to Alton begin to flood.
37.6 Damage begins to Ardent Mills grain bins in Alton within a foot of this height.
36.1 This represents the height of the Lincoln Shields levee just below the Missouri side of the Clark bridge.
35.5 At this approximate stage, Mel Price Lock and Dam must close the lock to navigation. This happened on July 10, 1993.
34.5 Near this height, the southbound lanes of U.S. Highway 67 will begin flooding, forcing the detour of southbound traffic onto the northbound lanes.
34.2 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.
32.9 Riverfront Park in Alton begins flooding.
31.5 Commercial basements in Alton begin to flood within a foot of this height.
30.5 Bloch Marine Service at the Harbor Point Yacht Club begins flooding within a foot of this level.
29.9 Route 100 at Alton closes within a foot of this height. Also at this level the north and south Wood River Levee structures are closed.
29.3 The North Wood River Levee must be closed at this level.
28.8 Highway 100 will begin flooding at Clifton Terrace Street within 2 feet of this height.
28.5 The South Wood River Levee must be closed at this level.
27.9 Missouri Highway 94 from Alta Villa Road to Feltes Drive will be closed near this height.
26.6 Within a foot of this height, outer road US 67 between Riverlands Way and the Lincoln Shields Access Road will close due to flooding.
26.5 Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club within a foot of this height.
25 Highway 94 and the east end of Harbor Point Road off of Highway 94 north of West Alton begin flooding within a foot or so of this height. Also, the access road to the Lincoln Shields area off Highway 67 just west of the Clark bridge begins flooding.
24 Alta Villa Road off of Highway 94 north of West Alton is closed within a foot of this height.
23 Dresser Island Drive floods within a foot of this level.
21 Flood Stage. Minor flooding begins to occur at this level.
20.8 Unprotected farm land begins to flood
18 Near this height, Mel Price Lock and Dam will go to "open river" conditions, lifting all gates out of the river.
Photos
(1) West Alton (foreground), downtown Alton (top), and Highway 67 (right) during 1993 flood.
(2) Looking downstream at the Alton riverfront during the flood of 1993.
(3) Riverfront flooding in downtown Alton during the flood of 1993 with the old and new Clark bridges.
(4) Flooding along Highway 67 in downtown Alton during the flood of 1993.
(5) Floodwater pumping from behind sandbags in downtown Alton during the flood of 1993.
(6) Sandbagging during 1993 flooding in downtown Alton, Illinois.
(7) Downtown Alton businesses at State Street and West Broadway on June 29, 2008 at 33.1 ft.
(8) Route 100 in downtown Alton on June 29, 2008 at an Alton tailwater stage of 33.1 feet.
(9) Argosy casino parking on June 29, 2008 at an Alton tailwater stage of 33.1 feet.
(10) ConAgra railroad tracks on June 21, 2008 at an Alton tailwater stage of 31.6 ft.
(11) Argosy casino parking on June 21, 2008 at an Alton tailwater stage of 31.6 feet.
(12) Riverfront Park on June 21, 2008 at an Alton tailwater stage of 31.6 feet.
(13) Access road to the Riverlands Environmental Demonstration Area on June 21, 2008 at 31.6 ft.
(14) Yachtview Drive looking north on May 22, 2009 at a stage of 25.8 feet.
(15) Jamie Circle at Harbor Point Yacht Club on May 22, 2009 at an Alton tailwater of 25.8 ft.
(16) Harbor Point Road flooded on May 22, 2009 at an Alton tailwater of 25.8 feet.
(17) Highway 94 north of West Alton, MO on May 22, 2009 at an Alton tailwater of 25.8 ft.
(18) Dresser Island Road on May 22, 2009 with an Alton tailwater stage of 25.8 feet.
(19) Melvin Price Lock and Dam (looking upstream)
(20) Melvin Price Lock and Dam #26
(21) Melvin Price Lock and Dam #26
(22) Melvin Price Lock and Dam (looking downstream)
About This Location Collapse

Latitude: 38.866389° N, Longitude: 90.146389° 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 395.04 ft 416.04 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 395.48 ft 416.48 ft 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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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.
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St. Charles, MO 63304
(636) 441-8467
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