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Hydrograph River at a Glance Download
Mississippi River at Mel Price (Alton) Lock and Dam Tailwater (ft)Flow (kcfs)Highest Observation: 13.06 ft at 12:00PM Oct 20, 2014Observed: 13.04 ft at 12:30PM Oct 20, 2014Observed: 13.02 ft at 1:00PM Oct 20, 2014Observed: 13 ft at 1:30PM Oct 20, 2014Observed: 13 ft at 2:00PM Oct 20, 2014Observed: 13 ft at 2:30PM Oct 20, 2014Observed: 12.98 ft at 3:00PM Oct 20, 2014Observed: 12.97 ft at 3:30PM Oct 20, 2014Observed: 12.95 ft at 4:00PM Oct 20, 2014Observed: 12.94 ft at 4:30PM Oct 20, 2014Observed: 12.93 ft at 5:00PM Oct 20, 2014Observed: 12.92 ft at 5:30PM Oct 20, 2014Observed: 12.92 ft at 6:00PM Oct 20, 2014Observed: 12.9 ft at 6:30PM Oct 20, 2014Observed: 12.88 ft at 7:00PM Oct 20, 2014Observed: 12.86 ft at 7:30PM Oct 20, 2014Observed: 12.84 ft at 8:00PM Oct 20, 2014Observed: 12.78 ft at 8:30PM Oct 20, 2014Observed: 12.56 ft at 9:00PM Oct 20, 2014Observed: 12.53 ft at 9:30PM Oct 20, 2014Observed: 12.47 ft at 10:00PM Oct 20, 2014Observed: 12.43 ft at 10:30PM Oct 20, 2014Observed: 12.5 ft at 11:00PM Oct 20, 2014Observed: 12.55 ft at 11:30PM Oct 20, 2014Observed: 12.59 ft at 12:00AM Oct 21, 2014Observed: 12.6 ft at 12:30AM Oct 21, 2014Observed: 12.62 ft at 1:00AM Oct 21, 2014Observed: 12.62 ft at 1:30AM Oct 21, 2014Observed: 12.63 ft at 2:00AM Oct 21, 2014Observed: 12.61 ft at 2:30AM Oct 21, 2014Observed: 12.61 ft at 3:00AM Oct 21, 2014Observed: 12.59 ft at 3:30AM Oct 21, 2014Observed: 12.59 ft at 4:00AM Oct 21, 2014Observed: 12.56 ft at 4:30AM Oct 21, 2014Observed: 12.54 ft at 5:00AM Oct 21, 2014Observed: 12.53 ft at 5:30AM Oct 21, 2014Observed: 12.54 ft at 6:00AM Oct 21, 2014Observed: 12.52 ft at 6:30AM Oct 21, 2014Observed: 12.49 ft at 7:00AM Oct 21, 2014Observed: 12.48 ft at 7:30AM Oct 21, 2014Observed: 12.49 ft at 8:00AM Oct 21, 2014Observed: 12.5 ft at 8:30AM Oct 21, 2014Observed: 12.47 ft at 9:00AM Oct 21, 2014Observed: 12.45 ft at 9:30AM Oct 21, 2014Observed: 12.46 ft at 10:00AM Oct 21, 2014Observed: 12.46 ft at 10:30AM Oct 21, 2014Observed: 12.44 ft at 11:00AM Oct 21, 2014Observed: 12.42 ft at 11:30AM Oct 21, 2014Observed: 12.42 ft at 12:00PM Oct 21, 2014Observed: 12.4 ft at 12:30PM Oct 21, 2014Observed: 12.4 ft at 1:00PM Oct 21, 2014Observed: 12.29 ft at 1:30PM Oct 21, 2014Observed: 12.18 ft at 2:00PM Oct 21, 2014Observed: 12.16 ft at 2:30PM Oct 21, 2014Observed: 12.14 ft at 3:00PM Oct 21, 2014Observed: 12.13 ft at 3:30PM Oct 21, 2014Observed: 12.21 ft at 4:00PM Oct 21, 2014Observed: 12.19 ft at 4:30PM Oct 21, 2014Observed: 12.19 ft at 5:00PM Oct 21, 2014Observed: 12.06 ft at 5:30PM Oct 21, 2014Observed: 12.02 ft at 6:00PM Oct 21, 2014Observed: 12 ft at 6:30PM Oct 21, 2014Observed: 11.98 ft at 7:00PM Oct 21, 2014Observed: 11.88 ft at 7:30PM Oct 21, 2014Observed: 11.78 ft at 8:00PM Oct 21, 2014Observed: 11.77 ft at 8:30PM Oct 21, 2014Observed: 11.74 ft at 9:00PM Oct 21, 2014Observed: 11.69 ft at 9:30PM Oct 21, 2014Observed: 11.68 ft at 10:00PM Oct 21, 2014Observed: 11.71 ft at 10:30PM Oct 21, 2014Observed: 11.68 ft at 11:00PM Oct 21, 2014Observed: 11.67 ft at 11:30PM Oct 21, 2014Observed: 11.66 ft at 12:00AM Oct 22, 2014Observed: 11.66 ft at 12:30AM Oct 22, 2014Observed: 11.7 ft at 1:00AM Oct 22, 2014Observed: 11.66 ft at 1:30AM Oct 22, 2014Observed: 11.71 ft at 2:00AM Oct 22, 2014Observed: 11.73 ft at 2:30AM Oct 22, 2014Observed: 11.75 ft at 3:00AM Oct 22, 2014Observed: 11.78 ft at 3:30AM Oct 22, 2014Observed: 11.77 ft at 4:00AM Oct 22, 2014Observed: 11.77 ft at 4:30AM Oct 22, 2014Observed: 11.77 ft at 5:00AM Oct 22, 2014Observed: 11.78 ft at 5:30AM Oct 22, 2014Observed: 11.8 ft at 6:00AM Oct 22, 2014Observed: 11.79 ft at 6:30AM Oct 22, 2014Observed: 11.79 ft at 7:00AM Oct 22, 2014Observed: 11.8 ft at 7:30AM Oct 22, 2014Observed: 11.82 ft at 8:00AM Oct 22, 2014Observed: 11.81 ft at 8:30AM Oct 22, 2014Observed: 11.8 ft at 9:00AM Oct 22, 2014Observed: 11.84 ft at 9:30AM Oct 22, 2014Observed: 11.82 ft at 10:00AM Oct 22, 2014Observed: 11.81 ft at 10:30AM Oct 22, 2014Observed: 11.8 ft at 11:00AM Oct 22, 2014Observed: 11.81 ft at 11:30AM Oct 22, 2014Observed: 11.81 ft at 12:00PM Oct 22, 2014Observed: 11.9 ft at 12:30PM Oct 22, 2014Observed: 11.9 ft at 1:00PM Oct 22, 2014Observed: 11.91 ft at 1:30PM Oct 22, 2014Observed: 11.94 ft at 2:00PM Oct 22, 2014Observed: 11.95 ft at 2:30PM Oct 22, 2014Observed: 11.94 ft at 3:00PM Oct 22, 2014Observed: 11.9 ft at 3:30PM Oct 22, 2014Observed: 11.9 ft at 4:00PM Oct 22, 2014Observed: 11.89 ft at 4:30PM Oct 22, 2014Observed: 11.85 ft at 5:00PM Oct 22, 2014Observed: 11.79 ft at 5:30PM Oct 22, 2014Observed: 11.79 ft at 6:00PM Oct 22, 2014Observed: 11.81 ft at 6:30PM Oct 22, 2014Observed: 11.76 ft at 7:00PM Oct 22, 2014Observed: 11.75 ft at 7:30PM Oct 22, 2014Observed: 11.77 ft at 8:00PM Oct 22, 2014Observed: 11.77 ft at 8:30PM Oct 22, 2014Observed: 11.75 ft at 9:00PM Oct 22, 2014Observed: 11.75 ft at 9:30PM Oct 22, 2014Observed: 11.76 ft at 10:00PM Oct 22, 2014Observed: 11.75 ft at 10:30PM Oct 22, 2014Observed: 11.75 ft at 11:00PM Oct 22, 2014Observed: 11.75 ft at 11:30PM Oct 22, 2014Observed: 11.75 ft at 12:00AM Oct 23, 2014Observed: 11.74 ft at 12:30AM Oct 23, 2014Observed: 11.75 ft at 1:00AM Oct 23, 2014Observed: 11.76 ft at 1:30AM Oct 23, 2014Observed: 11.75 ft at 2:00AM Oct 23, 2014Observed: 11.73 ft at 2:30AM Oct 23, 2014Observed: 11.75 ft at 3:00AM Oct 23, 2014Observed: 11.75 ft at 3:30AM Oct 23, 2014Observed: 11.74 ft at 4:00AM Oct 23, 2014Observed: 11.74 ft at 4:30AM Oct 23, 2014Observed: 11.75 ft at 5:00AM Oct 23, 2014Observed: 11.76 ft at 5:30AM Oct 23, 2014Observed: 11.75 ft at 6:00AM Oct 23, 2014Observed: 11.75 ft at 6:30AM Oct 23, 2014Observed: 11.77 ft at 7:00AM Oct 23, 2014Observed: 11.74 ft at 7:30AM Oct 23, 2014Observed: 11.74 ft at 8:00AM Oct 23, 2014Observed: 11.75 ft at 8:30AM Oct 23, 2014Observed: 11.76 ft at 9:00AM Oct 23, 2014Observed: 11.73 ft at 9:30AM Oct 23, 2014Observed: 11.72 ft at 10:00AM Oct 23, 2014Observed: 11.74 ft at 10:30AM Oct 23, 2014Observed: 11.74 ft at 11:00AM Oct 23, 2014Observed: 11.73 ft at 11:30AM Oct 23, 2014Observed: 11.74 ft at 12:00PM Oct 23, 2014Observed: 11.76 ft at 12:30PM Oct 23, 2014Observed: 11.74 ft at 1:00PM Oct 23, 2014Observed: 11.72 ft at 1:30PM Oct 23, 2014Observed: 11.66 ft at 2:00PM Oct 23, 2014Observed: 11.63 ft at 2:30PM Oct 23, 2014Observed: 11.53 ft at 3:00PM Oct 23, 2014Observed: 11.48 ft at 3:30PM Oct 23, 2014Observed: 11.45 ft at 4:00PM Oct 23, 2014Observed: 11.4 ft at 4:30PM Oct 23, 2014Observed: 11.36 ft at 5:00PM Oct 23, 2014Observed: 11.36 ft at 5:30PM Oct 23, 2014Observed: 11.36 ft at 6:00PM Oct 23, 2014Observed: 11.34 ft at 6:30PM Oct 23, 2014Observed: 11.33 ft at 7:00PM Oct 23, 2014Observed: 11.32 ft at 7:30PM Oct 23, 2014Observed: 11.33 ft at 8:00PM Oct 23, 2014Observed: 11.31 ft at 8:30PM Oct 23, 2014Observed: 11.31 ft at 9:00PM Oct 23, 2014Observed: 11.29 ft at 9:30PM Oct 23, 2014Observed: 11.31 ft at 10:00PM Oct 23, 2014Observed: 11.29 ft at 10:30PM Oct 23, 2014Observed: 11.27 ft at 11:00PM Oct 23, 2014Observed: 11.26 ft at 11:30PM Oct 23, 2014Observed: 11.29 ft at 12:00AM Oct 24, 2014Observed: 11.28 ft at 12:30AM Oct 24, 2014Observed: 11.27 ft at 1:00AM Oct 24, 2014Observed: 11.26 ft at 1:30AM Oct 24, 2014Observed: 11.27 ft at 2:00AM Oct 24, 2014Observed: 11.25 ft at 2:30AM Oct 24, 2014Observed: 11.24 ft at 3:00AM Oct 24, 2014Observed: 11.25 ft at 3:30AM Oct 24, 2014Observed: 11.24 ft at 4:00AM Oct 24, 2014Observed: 11.23 ft at 4:30AM Oct 24, 2014Observed: 11.23 ft at 5:00AM Oct 24, 2014Observed: 11.23 ft at 5:30AM Oct 24, 2014Observed: 11.23 ft at 6:00AM Oct 24, 2014Observed: 11.13 ft at 6:30AM Oct 24, 2014Observed: 11.12 ft at 7:00AM Oct 24, 2014Observed: 11.1 ft at 7:30AM Oct 24, 2014Observed: 11.09 ft at 8:00AM Oct 24, 2014Observed: 11.08 ft at 8:30AM Oct 24, 2014Observed: 11.05 ft at 9:00AM Oct 24, 2014Observed: 11.02 ft at 9:30AM Oct 24, 2014Observed: 11 ft at 10:00AM Oct 24, 2014Observed: 11.01 ft at 10:30AM Oct 24, 2014Observed: 11 ft at 11:00AM Oct 24, 2014Observed: 10.98 ft at 11:30AM Oct 24, 2014Observed: 10.96 ft at 12:00PM Oct 24, 2014Observed: 10.98 ft at 12:30PM Oct 24, 2014Observed: 10.84 ft at 1:00PM Oct 24, 2014Observed: 10.78 ft at 1:30PM Oct 24, 2014Observed: 10.76 ft at 2:00PM Oct 24, 2014Observed: 10.71 ft at 2:30PM Oct 24, 2014Observed: 10.57 ft at 3:00PM Oct 24, 2014Observed: 10.5 ft at 3:30PM Oct 24, 2014Observed: 10.49 ft at 4:00PM Oct 24, 2014Observed: 10.44 ft at 4:30PM Oct 24, 2014Observed: 10.4 ft at 5:00PM Oct 24, 2014Observed: 10.37 ft at 5:30PM Oct 24, 2014Observed: 10.35 ft at 6:00PM Oct 24, 2014Observed: 10.34 ft at 6:30PM Oct 24, 2014Observed: 10.31 ft at 7:00PM Oct 24, 2014Observed: 10.31 ft at 7:30PM Oct 24, 2014Observed: 10.32 ft at 8:00PM Oct 24, 2014Observed: 10.32 ft at 8:30PM Oct 24, 2014Observed: 10.33 ft at 9:00PM Oct 24, 2014Observed: 10.32 ft at 9:30PM Oct 24, 2014Observed: 10.33 ft at 10:00PM Oct 24, 2014Observed: 10.35 ft at 10:30PM Oct 24, 2014Observed: 10.32 ft at 11:00PM Oct 24, 2014Observed: 10.33 ft at 11:30PM Oct 24, 2014Observed: 10.32 ft at 12:00AM Oct 25, 2014Observed: 10.32 ft at 12:30AM Oct 25, 2014Observed: 10.33 ft at 1:00AM Oct 25, 2014Observed: 10.33 ft at 1:30AM Oct 25, 2014Observed: 10.32 ft at 2:00AM Oct 25, 2014Observed: 10.33 ft at 2:30AM Oct 25, 2014Observed: 10.34 ft at 3:00AM Oct 25, 2014Observed: 10.42 ft at 3:30AM Oct 25, 2014Observed: 10.66 ft at 4:00AM Oct 25, 2014Observed: 10.73 ft at 4:30AM Oct 25, 2014Observed: 10.8 ft at 5:00AM Oct 25, 2014Observed: 10.86 ft at 5:30AM Oct 25, 2014Observed: 10.9 ft at 6:00AM Oct 25, 2014Observed: 10.92 ft at 6:30AM Oct 25, 2014Observed: 10.94 ft at 7:00AM Oct 25, 2014Observed: 10.93 ft at 7:30AM Oct 25, 2014Observed: 10.93 ft at 8:00AM Oct 25, 2014Observed: 10.89 ft at 8:30AM Oct 25, 2014Observed: 10.86 ft at 9:00AM Oct 25, 2014Observed: 10.87 ft at 9:30AM Oct 25, 2014Observed: 10.88 ft at 10:00AM Oct 25, 2014Observed: 10.79 ft at 10:30AM Oct 25, 2014Observed: 10.75 ft at 11:00AM Oct 25, 2014Highest Forecast: 9.9 ft 1:00PM Oct 25, 2014Forecast: 9.8 ft 7:00PM Oct 25, 2014Forecast: 9.7 ft 1:00AM Oct 26, 2014Forecast: 9.5 ft 7:00AM Oct 26, 2014Forecast: 9.4 ft 1:00PM Oct 26, 2014Forecast: 9.3 ft 7:00PM Oct 26, 2014Forecast: 9.2 ft 1:00AM Oct 27, 2014Forecast: 9 ft 7:00AM Oct 27, 2014Forecast: 8.9 ft 1:00PM Oct 27, 2014Forecast: 8.9 ft 7:00PM Oct 27, 2014Forecast: 8.7 ft 1:00AM Oct 28, 2014Forecast: 8.6 ft 7:00AM Oct 28, 2014Forecast: 8.5 ft 1:00PM Oct 28, 2014Forecast: 8.3 ft 7:00PM Oct 28, 2014Forecast: 8.2 ft 1:00AM Oct 29, 2014Forecast: 8.2 ft 7:00AM Oct 29, 2014Forecast: 8.1 ft 1:00PM Oct 29, 2014Forecast: 8 ft 7:00PM Oct 29, 2014Forecast: 7.9 ft 1:00AM Oct 30, 2014Forecast: 7.8 ft 7:00AM Oct 30, 2014Forecast: 7.7 ft 1:00PM Oct 30, 2014Forecast: 7.6 ft 7:00PM Oct 30, 2014Forecast: 7.4 ft 1:00AM Oct 31, 2014Forecast: 7.2 ft 7:00AM Oct 31, 2014Forecast: 7.1 ft 1:00PM Oct 31, 2014Forecast: 6.9 ft 7:00PM Oct 31, 2014Forecast: 6.7 ft 1:00AM Nov 01, 2014Forecast: 6.6 ft 7:00AM Nov 01, 2014Forecast: 6.5 ft 1:00PM Nov 01, 2014Forecast: 6.4 ft 7:00PM Nov 01, 2014Forecast: 6.3 ft 1:00AM Nov 02, 2014Forecast: 6.2 ft 6:00AM Nov 02, 2014Forecast: 6.1 ft 12:00PM Nov 02, 2014Forecast: 6.1 ft 6:00PM Nov 02, 2014Forecast: 6 ft 12:00AM Nov 03, 2014Forecast: 6 ft 6:00AM Nov 03, 2014Forecast: 5.9 ft 12:00PM Nov 03, 2014Forecast: 5.9 ft 6:00PM Nov 03, 2014Forecast: 5.8 ft 12:00AM Nov 04, 2014Forecast: 5.8 ft 6:00AM Nov 04, 2014Forecast: 5.7 ft 12:00PM Nov 04, 2014Forecast: 5.7 ft 6:00PM Nov 04, 2014Forecast: 5.7 ft 12:00AM Nov 05, 2014Forecast: 5.6 ft 6:00AM Nov 05, 2014Forecast: 5.6 ft 12:00PM Nov 05, 2014Forecast: 5.5 ft 6:00PM Nov 05, 2014Forecast: 5.5 ft 12:00AM Nov 06, 2014Forecast: 5.4 ft 6:00AM Nov 06, 2014Forecast: 5.4 ft 12:00PM Nov 06, 2014Forecast: 5.3 ft 6:00PM Nov 06, 2014Forecast: 5.2 ft 12:00AM Nov 07, 2014Forecast: 5.2 ft 6:00AM Nov 07, 2014Forecast: 5.2 ft 12:00PM Nov 07, 2014Forecast: 5.1 ft 6:00PM Nov 07, 2014USGS--Water Resources of the United StatesALNI2(plotting HTIRG) Graph Created (11:35AM Oct 25, 2014)ObservedForecast (issued 8:28PM Oct 24)Latest observed value: 10.75 ft at 11:00 AM CDT 25-Oct-2014. Flood Stage is 21 ft
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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 Mel Price (Alton) Lock and Dam are issued routinely year-round.

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Upstream Gauge - at Grafton 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

Historical Crests
(1) 42.72 ft on 08/01/1993
(2) 36.90 ft on 06/18/1844
(3) 36.89 ft on 04/28/1973
(4) 35.10 ft on 05/22/1995
(5) 34.38 ft on 06/04/2013
(6) 34.20 ft on 10/09/1986
(7) 33.21 ft on 05/01/1983
(8) 33.08 ft on 06/30/2008
(9) 32.44 ft on 12/08/1982
(10) 30.80 ft on 04/18/1993
Show More Historical 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
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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.
40 Railroad tracks from Wood River to Alton begin to flood.
37.6 Damage begins to ConAgra Flour Milling Company 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 last happened on July 10, 1993.
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.
29.5 The southbound lanes of U.S. Highway 67 will flood within a foot of this level. Southbound traffic will have to be diverted onto the northbound lanes.
29.3 The North Wood River Levee must be closed at this level.
28.8 When the Missouri River is near 27 feet, Highway 100 will begin flooding at Clifton Terrace Street near this height.
28.5 The South Wood River Levee must be closed at this level.
26.5 Yachtview Drive begins flooding along the entrance to Harbor Point Yacht Club within a foot of this height.
26 Within a foot of this height, outer road US 67 between Riverlands Way and the Lincoln Shields Access Road will close due to flooding.
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) Sandbagging during 1993 flooding in downtown Alton, Illinois.
(3) Floodwater pumping from behind sandbags in downtown Alton during the flood of 1993.
(4) Flooding along Highway 67 in downtown Alton during the flood of 1993.
(5) Riverfront flooding in downtown Alton during the flood of 1993 with the old and new Clark bridges.
(6) Looking downstream at the Alton riverfront during the flood of 1993.
(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) Alton Riverfront Park on June 21, 2008 at an Alton tailwater of 31.6 feet.
(13) Riverfront Park on June 21, 2008 at an Alton tailwater stage of 31.6 feet.
(14) Access road to the Riverlands Environmental Demonstration Area on June 21, 2008 at 31.6 ft.
(15) Yachtview Drive looking north on May 22, 2009 at a stage of 25.8 feet.
(16) Jamie Circle at Harbor Point Yacht Club on May 22, 2009 at an Alton tailwater of 25.8 ft.
(17) Harbor Point Road flooded on May 22, 2009 at an Alton tailwater of 25.8 feet.
(18) Highway 94 north of West Alton, MO on May 22, 2009 at an Alton tailwater of 25.8 ft.
(19) Dresser Island Road on May 22, 2009 with an Alton tailwater stage of 25.8 feet.
(20) Melvin Price Lock and Dam (looking upstream)
(21) Melvin Price Lock and Dam #26
(22) Melvin Price Lock and Dam #26
(23) 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 Not Available Not Available 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.
NWS Information
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12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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Page last modified: 5-Aug-2014 6:38 PM
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