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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: 9.99 ft at 2:00PM Apr 11, 2014Highest Observation: 9.99 ft at 2:30PM Apr 11, 2014Highest Observation: 9.99 ft at 3:00PM Apr 11, 2014Observed: 9.98 ft at 3:30PM Apr 11, 2014Observed: 9.98 ft at 4:00PM Apr 11, 2014Observed: 9.96 ft at 4:30PM Apr 11, 2014Highest Observation: 9.99 ft at 5:30PM Apr 11, 2014Observed: 9.96 ft at 6:00PM Apr 11, 2014Highest Observation: 9.99 ft at 7:00PM Apr 11, 2014Highest Observation: 9.99 ft at 7:30PM Apr 11, 2014Observed: 9.96 ft at 8:00PM Apr 11, 2014Observed: 9.96 ft at 8:30PM Apr 11, 2014Highest Observation: 9.99 ft at 9:30PM Apr 11, 2014Observed: 9.95 ft at 10:00PM Apr 11, 2014Observed: 9.97 ft at 11:00PM Apr 11, 2014Observed: 9.92 ft at 12:00AM Apr 12, 2014Observed: 9.94 ft at 12:30AM Apr 12, 2014Observed: 9.93 ft at 1:00AM Apr 12, 2014Observed: 9.9 ft at 2:00AM Apr 12, 2014Observed: 9.9 ft at 2:30AM Apr 12, 2014Observed: 9.93 ft at 3:00AM Apr 12, 2014Observed: 9.89 ft at 4:00AM Apr 12, 2014Observed: 9.86 ft at 4:30AM Apr 12, 2014Observed: 9.88 ft at 5:00AM Apr 12, 2014Observed: 9.9 ft at 5:30AM Apr 12, 2014Observed: 9.91 ft at 6:00AM Apr 12, 2014Observed: 9.88 ft at 6:30AM Apr 12, 2014Observed: 9.9 ft at 7:00AM Apr 12, 2014Observed: 9.85 ft at 8:00AM Apr 12, 2014Observed: 9.86 ft at 9:00AM Apr 12, 2014Observed: 9.86 ft at 9:30AM Apr 12, 2014Observed: 9.86 ft at 10:30AM Apr 12, 2014Observed: 9.87 ft at 11:00AM Apr 12, 2014Observed: 9.89 ft at 12:00PM Apr 12, 2014Observed: 9.89 ft at 12:30PM Apr 12, 2014Observed: 9.9 ft at 1:00PM Apr 12, 2014Observed: 9.86 ft at 1:30PM Apr 12, 2014Observed: 9.86 ft at 2:00PM Apr 12, 2014Observed: 9.86 ft at 2:30PM Apr 12, 2014Observed: 9.87 ft at 3:00PM Apr 12, 2014Observed: 9.89 ft at 3:30PM Apr 12, 2014Observed: 9.87 ft at 4:00PM Apr 12, 2014Observed: 9.87 ft at 4:30PM Apr 12, 2014Observed: 9.85 ft at 5:00PM Apr 12, 2014Observed: 9.87 ft at 5:30PM Apr 12, 2014Observed: 9.86 ft at 6:00PM Apr 12, 2014Observed: 9.85 ft at 6:30PM Apr 12, 2014Observed: 9.86 ft at 7:00PM Apr 12, 2014Observed: 9.83 ft at 7:30PM Apr 12, 2014Observed: 9.83 ft at 8:00PM Apr 12, 2014Observed: 9.82 ft at 8:30PM Apr 12, 2014Observed: 9.83 ft at 9:00PM Apr 12, 2014Observed: 9.81 ft at 9:30PM Apr 12, 2014Observed: 9.83 ft at 10:00PM Apr 12, 2014Observed: 9.79 ft at 10:30PM Apr 12, 2014Observed: 9.81 ft at 11:00PM Apr 12, 2014Observed: 9.92 ft at 11:30PM Apr 12, 2014Observed: 9.94 ft at 12:00AM Apr 13, 2014Observed: 9.98 ft at 12:30AM Apr 13, 2014Observed: 9.97 ft at 1:00AM Apr 13, 2014Observed: 9.96 ft at 1:30AM Apr 13, 2014Observed: 9.96 ft at 2:00AM Apr 13, 2014Observed: 9.94 ft at 2:30AM Apr 13, 2014Observed: 9.94 ft at 3:00AM Apr 13, 2014Observed: 9.95 ft at 3:30AM Apr 13, 2014Observed: 9.98 ft at 4:00AM Apr 13, 2014Observed: 9.95 ft at 4:30AM Apr 13, 2014Observed: 9.94 ft at 5:00AM Apr 13, 2014Observed: 9.92 ft at 5:30AM Apr 13, 2014Observed: 9.96 ft at 6:00AM Apr 13, 2014Observed: 9.95 ft at 6:30AM Apr 13, 2014Observed: 9.93 ft at 7:00AM Apr 13, 2014Observed: 9.96 ft at 7:30AM Apr 13, 2014Observed: 9.94 ft at 8:00AM Apr 13, 2014Observed: 9.91 ft at 8:30AM Apr 13, 2014Observed: 9.91 ft at 9:00AM Apr 13, 2014Observed: 9.94 ft at 9:30AM Apr 13, 2014Observed: 9.91 ft at 10:00AM Apr 13, 2014Observed: 9.96 ft at 10:30AM Apr 13, 2014Observed: 9.95 ft at 11:00AM Apr 13, 2014Observed: 9.93 ft at 11:30AM Apr 13, 2014Observed: 9.98 ft at 12:00PM Apr 13, 2014Observed: 9.96 ft at 1:00PM Apr 13, 2014Observed: 9.94 ft at 1:30PM Apr 13, 2014Observed: 9.95 ft at 2:30PM Apr 13, 2014Observed: 9.94 ft at 3:30PM Apr 13, 2014Observed: 9.93 ft at 4:30PM Apr 13, 2014Observed: 9.96 ft at 5:00PM Apr 13, 2014Observed: 9.93 ft at 6:00PM Apr 13, 2014Observed: 9.94 ft at 6:30PM Apr 13, 2014Observed: 9.91 ft at 7:00PM Apr 13, 2014Observed: 9.92 ft at 7:30PM Apr 13, 2014Observed: 9.93 ft at 8:30PM Apr 13, 2014Observed: 9.92 ft at 9:00PM Apr 13, 2014Observed: 9.87 ft at 9:30PM Apr 13, 2014Observed: 9.86 ft at 10:00PM Apr 13, 2014Observed: 9.85 ft at 10:30PM Apr 13, 2014Observed: 9.87 ft at 11:00PM Apr 13, 2014Observed: 9.85 ft at 11:30PM Apr 13, 2014Observed: 9.82 ft at 12:00AM Apr 14, 2014Observed: 9.66 ft at 12:30AM Apr 14, 2014Observed: 9.68 ft at 1:00AM Apr 14, 2014Observed: 9.65 ft at 1:30AM Apr 14, 2014Observed: 9.57 ft at 2:00AM Apr 14, 2014Observed: 9.59 ft at 2:30AM Apr 14, 2014Observed: 9.57 ft at 3:00AM Apr 14, 2014Observed: 9.57 ft at 3:30AM Apr 14, 2014Observed: 9.56 ft at 4:00AM Apr 14, 2014Observed: 9.56 ft at 4:30AM Apr 14, 2014Observed: 9.48 ft at 5:00AM Apr 14, 2014Observed: 9.45 ft at 5:30AM Apr 14, 2014Observed: 9.39 ft at 6:00AM Apr 14, 2014Observed: 9.38 ft at 6:30AM Apr 14, 2014Observed: 9.36 ft at 7:00AM Apr 14, 2014Observed: 9.35 ft at 7:30AM Apr 14, 2014Observed: 9.32 ft at 8:00AM Apr 14, 2014Observed: 9.33 ft at 9:00AM Apr 14, 2014Observed: 9.33 ft at 9:30AM Apr 14, 2014Observed: 9.34 ft at 10:00AM Apr 14, 2014Observed: 9.31 ft at 10:30AM Apr 14, 2014Observed: 9.31 ft at 11:00AM Apr 14, 2014Observed: 9.3 ft at 11:30AM Apr 14, 2014Observed: 9.32 ft at 12:00PM Apr 14, 2014Observed: 9.28 ft at 12:30PM Apr 14, 2014Observed: 9.29 ft at 1:00PM Apr 14, 2014Observed: 9.3 ft at 1:30PM Apr 14, 2014Observed: 9.31 ft at 2:00PM Apr 14, 2014Observed: 9.28 ft at 2:30PM Apr 14, 2014Observed: 9.29 ft at 3:00PM Apr 14, 2014Observed: 9.31 ft at 3:30PM Apr 14, 2014Observed: 9.27 ft at 4:00PM Apr 14, 2014Observed: 9.29 ft at 4:30PM Apr 14, 2014Observed: 9.33 ft at 5:00PM Apr 14, 2014Observed: 9.37 ft at 5:30PM Apr 14, 2014Observed: 9.38 ft at 6:00PM Apr 14, 2014Observed: 9.43 ft at 6:30PM Apr 14, 2014Observed: 9.38 ft at 7:00PM Apr 14, 2014Observed: 9.39 ft at 7:30PM Apr 14, 2014Observed: 9.35 ft at 8:00PM Apr 14, 2014Observed: 9.44 ft at 8:30PM Apr 14, 2014Observed: 9.42 ft at 9:00PM Apr 14, 2014Observed: 9.4 ft at 9:30PM Apr 14, 2014Observed: 9.4 ft at 10:00PM Apr 14, 2014Observed: 9.41 ft at 10:30PM Apr 14, 2014Observed: 9.41 ft at 11:30PM Apr 14, 2014Observed: 9.37 ft at 12:00AM Apr 15, 2014Observed: 9.36 ft at 12:30AM Apr 15, 2014Observed: 9.39 ft at 1:00AM Apr 15, 2014Observed: 9.4 ft at 1:30AM Apr 15, 2014Observed: 9.41 ft at 2:00AM Apr 15, 2014Observed: 9.36 ft at 2:30AM Apr 15, 2014Observed: 9.38 ft at 3:00AM Apr 15, 2014Observed: 9.38 ft at 3:30AM Apr 15, 2014Observed: 9.36 ft at 4:00AM Apr 15, 2014Observed: 9.35 ft at 4:30AM Apr 15, 2014Observed: 9.39 ft at 5:00AM Apr 15, 2014Observed: 9.35 ft at 5:30AM Apr 15, 2014Observed: 9.34 ft at 6:00AM Apr 15, 2014Observed: 9.37 ft at 6:30AM Apr 15, 2014Observed: 9.34 ft at 7:00AM Apr 15, 2014Observed: 9.37 ft at 7:30AM Apr 15, 2014Observed: 9.34 ft at 8:00AM Apr 15, 2014Observed: 9.37 ft at 8:30AM Apr 15, 2014Observed: 9.35 ft at 9:00AM Apr 15, 2014Observed: 9.35 ft at 9:30AM Apr 15, 2014Observed: 9.35 ft at 10:00AM Apr 15, 2014Observed: 9.36 ft at 10:30AM Apr 15, 2014Observed: 9.32 ft at 11:00AM Apr 15, 2014Observed: 9.39 ft at 11:30AM Apr 15, 2014Observed: 9.32 ft at 12:00PM Apr 15, 2014Observed: 9.33 ft at 12:30PM Apr 15, 2014Observed: 9.34 ft at 1:00PM Apr 15, 2014Observed: 9.3 ft at 1:30PM Apr 15, 2014Observed: 9.31 ft at 2:00PM Apr 15, 2014Observed: 9.34 ft at 2:30PM Apr 15, 2014Observed: 9.29 ft at 3:00PM Apr 15, 2014Observed: 9.31 ft at 3:30PM Apr 15, 2014Observed: 9.28 ft at 4:00PM Apr 15, 2014Observed: 9.31 ft at 4:30PM Apr 15, 2014Observed: 9.26 ft at 5:00PM Apr 15, 2014Observed: 9.29 ft at 5:30PM Apr 15, 2014Observed: 9.31 ft at 6:00PM Apr 15, 2014Observed: 9.29 ft at 6:30PM Apr 15, 2014Observed: 9.29 ft at 7:00PM Apr 15, 2014Observed: 9.28 ft at 7:30PM Apr 15, 2014Observed: 9.3 ft at 8:00PM Apr 15, 2014Observed: 9.17 ft at 8:30PM Apr 15, 2014Observed: 9.15 ft at 9:00PM Apr 15, 2014Observed: 9.15 ft at 9:30PM Apr 15, 2014Observed: 9.15 ft at 10:00PM Apr 15, 2014Observed: 9.09 ft at 10:30PM Apr 15, 2014Observed: 9.1 ft at 11:00PM Apr 15, 2014Observed: 9.11 ft at 11:30PM Apr 15, 2014Observed: 9.17 ft at 12:00AM Apr 16, 2014Observed: 9.17 ft at 12:30AM Apr 16, 2014Observed: 9.22 ft at 1:00AM Apr 16, 2014Observed: 9.26 ft at 1:30AM Apr 16, 2014Observed: 9.21 ft at 2:00AM Apr 16, 2014Observed: 9.36 ft at 2:30AM Apr 16, 2014Observed: 9.43 ft at 3:00AM Apr 16, 2014Observed: 9.34 ft at 3:30AM Apr 16, 2014Observed: 9.39 ft at 4:00AM Apr 16, 2014Observed: 9.4 ft at 4:30AM Apr 16, 2014Observed: 9.4 ft at 5:00AM Apr 16, 2014Observed: 9.41 ft at 5:30AM Apr 16, 2014Observed: 9.45 ft at 6:00AM Apr 16, 2014Observed: 9.43 ft at 6:30AM Apr 16, 2014Observed: 9.43 ft at 7:00AM Apr 16, 2014Observed: 9.45 ft at 7:30AM Apr 16, 2014Observed: 9.48 ft at 8:00AM Apr 16, 2014Observed: 9.48 ft at 8:30AM Apr 16, 2014Observed: 9.47 ft at 9:00AM Apr 16, 2014Observed: 9.5 ft at 9:30AM Apr 16, 2014Observed: 9.51 ft at 10:00AM Apr 16, 2014Observed: 9.5 ft at 10:30AM Apr 16, 2014Observed: 9.51 ft at 11:00AM Apr 16, 2014Observed: 9.48 ft at 11:30AM Apr 16, 2014Observed: 9.42 ft at 12:00PM Apr 16, 2014Observed: 9.53 ft at 12:30PM Apr 16, 2014Observed: 9.45 ft at 1:00PM Apr 16, 2014Observed: 9.44 ft at 1:30PM Apr 16, 2014Forecast: 9.6 ft 7:00PM Apr 16, 2014Forecast: 9.9 ft 1:00AM Apr 17, 2014Forecast: 10.2 ft 7:00AM Apr 17, 2014Forecast: 10.6 ft 1:00PM Apr 17, 2014Forecast: 10.9 ft 7:00PM Apr 17, 2014Forecast: 11.2 ft 1:00AM Apr 18, 2014Forecast: 11.5 ft 7:00AM Apr 18, 2014Forecast: 11.9 ft 1:00PM Apr 18, 2014Forecast: 12.2 ft 7:00PM Apr 18, 2014Forecast: 12.4 ft 1:00AM Apr 19, 2014Forecast: 12.7 ft 7:00AM Apr 19, 2014Forecast: 12.9 ft 1:00PM Apr 19, 2014Forecast: 13.1 ft 7:00PM Apr 19, 2014Forecast: 13.2 ft 1:00AM Apr 20, 2014Forecast: 13.3 ft 7:00AM Apr 20, 2014Forecast: 13.4 ft 1:00PM Apr 20, 2014Forecast: 13.5 ft 7:00PM Apr 20, 2014Forecast: 13.6 ft 1:00AM Apr 21, 2014Forecast: 13.6 ft 7:00AM Apr 21, 2014Forecast: 13.7 ft 1:00PM Apr 21, 2014Forecast: 13.7 ft 7:00PM Apr 21, 2014Forecast: 13.7 ft 1:00AM Apr 22, 2014Forecast: 13.7 ft 7:00AM Apr 22, 2014Forecast: 13.8 ft 1:00PM Apr 22, 2014Forecast: 13.8 ft 7:00PM Apr 22, 2014Forecast: 13.8 ft 1:00AM Apr 23, 2014Highest Forecast: 13.9 ft 7:00AM Apr 23, 2014Highest Forecast: 13.9 ft 1:00PM Apr 23, 2014USGS--Water Resources of the United StatesALNI2(plotting HTIRG) Graph Created (1:50PM Apr 16, 2014)ObservedForecast (issued 11:14AM Apr 16)Latest observed value: 9.44 ft at 1:30 PM CDT 16-Apr-2014. Flood Stage is 21 ft
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Tabular Data (UTC)
Tabular Data (CDT)
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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

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
Zoom Level: 16
Gauge Location
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
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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.
38.6 Flood waters reach the low steel on RR bridge swing span in Alton.
37.6 Damage begins to Miller Milling Company in Alton.
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.
33 Urban flood damage begins in Elsah, Illinois and Portage des Sioux.
32.9 Riverfront Park in Alton begins flooding.
31.6 At this height, MoDOT will sandbag Lincoln Shields Access to protect Highway 367 near the Clark bridge.
31.5 Commercial basements in Alton begin to flood.
30.5 Bloch Marine Service at the Harbor Point Yacht Club begins flooding near this level.
29.9 Route 100 at Alton closes. 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 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.
25 Highway 94 and the east end of Harbor Point Road off of Highway 94 north of West Alton begin flooding. 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.
23 Dresser Island Drive floods at this level.
21 Flood Stage. Minor flooding begins to occur at this level.
20.8 Unprotected farm land begins to flood
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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Page last modified: 8-Apr-2014 7:35 AM
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