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Over 200 USGS real-time streamgages used to support NWS river forecasts and warnings are at risk of being discontinued. Click here for more information from the USGS...
Weather Forecast Office New Orleans/Baton Rouge, LA Lower Mississippi River Forecast Center
Flood Warning
View all valid statements/warnings
Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Atchafalaya River at Myette Point/Grand Lake Stage (ft)Observed: 9.77 ft at 7:00PM May 16, 2013Observed: 9.77 ft at 7:30PM May 16, 2013Observed: 9.77 ft at 8:00PM May 16, 2013Observed: 9.78 ft at 8:30PM May 16, 2013Observed: 9.78 ft at 9:00PM May 16, 2013Observed: 9.78 ft at 9:30PM May 16, 2013Observed: 9.78 ft at 10:00PM May 16, 2013Observed: 9.78 ft at 10:30PM May 16, 2013Observed: 9.78 ft at 11:00PM May 16, 2013Observed: 9.79 ft at 11:30PM May 16, 2013Observed: 9.79 ft at 12:00AM May 17, 2013Observed: 9.79 ft at 12:30AM May 17, 2013Observed: 9.79 ft at 1:00AM May 17, 2013Observed: 9.79 ft at 1:30AM May 17, 2013Observed: 9.79 ft at 2:00AM May 17, 2013Observed: 9.79 ft at 2:30AM May 17, 2013Observed: 9.79 ft at 3:00AM May 17, 2013Observed: 9.8 ft at 3:30AM May 17, 2013Observed: 9.8 ft at 4:00AM May 17, 2013Observed: 9.8 ft at 4:30AM May 17, 2013Observed: 9.8 ft at 5:00AM May 17, 2013Observed: 9.8 ft at 5:30AM May 17, 2013Observed: 9.8 ft at 6:00AM May 17, 2013Observed: 9.81 ft at 6:30AM May 17, 2013Observed: 9.81 ft at 7:00AM May 17, 2013Observed: 9.81 ft at 7:30AM May 17, 2013Observed: 9.81 ft at 8:00AM May 17, 2013Observed: 9.81 ft at 8:30AM May 17, 2013Observed: 9.82 ft at 9:00AM May 17, 2013Observed: 9.82 ft at 9:30AM May 17, 2013Observed: 9.82 ft at 10:00AM May 17, 2013Observed: 9.82 ft at 10:30AM May 17, 2013Observed: 9.83 ft at 11:00AM May 17, 2013Observed: 9.82 ft at 11:30AM May 17, 2013Observed: 9.82 ft at 12:00PM May 17, 2013Observed: 9.83 ft at 12:30PM May 17, 2013Observed: 9.83 ft at 1:00PM May 17, 2013Observed: 9.84 ft at 1:30PM May 17, 2013Observed: 9.84 ft at 2:00PM May 17, 2013Observed: 9.84 ft at 2:30PM May 17, 2013Observed: 9.84 ft at 3:00PM May 17, 2013Observed: 9.84 ft at 3:30PM May 17, 2013Observed: 9.85 ft at 4:00PM May 17, 2013Observed: 9.85 ft at 4:30PM May 17, 2013Observed: 9.86 ft at 5:00PM May 17, 2013Observed: 9.86 ft at 5:30PM May 17, 2013Observed: 9.86 ft at 6:00PM May 17, 2013Observed: 9.87 ft at 6:30PM May 17, 2013Observed: 9.87 ft at 7:00PM May 17, 2013Observed: 9.87 ft at 7:30PM May 17, 2013Observed: 9.87 ft at 8:00PM May 17, 2013Observed: 9.87 ft at 8:30PM May 17, 2013Observed: 9.87 ft at 9:00PM May 17, 2013Observed: 9.86 ft at 9:30PM May 17, 2013Observed: 9.86 ft at 10:00PM May 17, 2013Observed: 9.86 ft at 10:30PM May 17, 2013Observed: 9.86 ft at 11:00PM May 17, 2013Observed: 9.86 ft at 11:30PM May 17, 2013Observed: 9.86 ft at 12:00AM May 18, 2013Observed: 9.86 ft at 12:30AM May 18, 2013Observed: 9.86 ft at 1:00AM May 18, 2013Observed: 9.86 ft at 1:30AM May 18, 2013Observed: 9.86 ft at 2:00AM May 18, 2013Observed: 9.86 ft at 2:30AM May 18, 2013Observed: 9.86 ft at 3:00AM May 18, 2013Observed: 9.86 ft at 3:30AM May 18, 2013Observed: 9.87 ft at 4:00AM May 18, 2013Observed: 9.87 ft at 4:30AM May 18, 2013Observed: 9.87 ft at 5:00AM May 18, 2013Observed: 9.87 ft at 5:30AM May 18, 2013Observed: 9.87 ft at 6:00AM May 18, 2013Observed: 9.87 ft at 6:30AM May 18, 2013Observed: 9.87 ft at 7:00AM May 18, 2013Observed: 9.87 ft at 7:30AM May 18, 2013Observed: 9.87 ft at 8:00AM May 18, 2013Observed: 9.87 ft at 8:30AM May 18, 2013Observed: 9.87 ft at 9:00AM May 18, 2013Observed: 9.88 ft at 9:30AM May 18, 2013Observed: 9.88 ft at 10:00AM May 18, 2013Observed: 9.88 ft at 10:30AM May 18, 2013Observed: 9.89 ft at 11:00AM May 18, 2013Observed: 9.88 ft at 11:30AM May 18, 2013Observed: 9.89 ft at 12:00PM May 18, 2013Observed: 9.89 ft at 12:30PM May 18, 2013Observed: 9.9 ft at 1:00PM May 18, 2013Observed: 9.9 ft at 1:30PM May 18, 2013Observed: 9.9 ft at 2:00PM May 18, 2013Observed: 9.9 ft at 2:30PM May 18, 2013Observed: 9.91 ft at 3:00PM May 18, 2013Observed: 9.91 ft at 3:30PM May 18, 2013Observed: 9.91 ft at 4:00PM May 18, 2013Observed: 9.91 ft at 4:30PM May 18, 2013Observed: 9.91 ft at 5:00PM May 18, 2013Observed: 9.92 ft at 5:30PM May 18, 2013Observed: 9.92 ft at 6:00PM May 18, 2013Observed: 9.92 ft at 6:30PM May 18, 2013Observed: 9.93 ft at 7:00PM May 18, 2013Observed: 9.93 ft at 7:30PM May 18, 2013Observed: 9.93 ft at 8:00PM May 18, 2013Observed: 9.94 ft at 8:30PM May 18, 2013Observed: 9.94 ft at 9:00PM May 18, 2013Observed: 9.94 ft at 9:30PM May 18, 2013Observed: 9.94 ft at 10:00PM May 18, 2013Observed: 9.94 ft at 10:30PM May 18, 2013Observed: 9.94 ft at 11:00PM May 18, 2013Observed: 9.94 ft at 11:30PM May 18, 2013Observed: 9.94 ft at 12:00AM May 19, 2013Observed: 9.94 ft at 12:30AM May 19, 2013Observed: 9.94 ft at 1:00AM May 19, 2013Observed: 9.94 ft at 1:30AM May 19, 2013Observed: 9.94 ft at 2:00AM May 19, 2013Observed: 9.94 ft at 2:30AM May 19, 2013Observed: 9.94 ft at 3:00AM May 19, 2013Observed: 9.94 ft at 3:30AM May 19, 2013Observed: 9.94 ft at 4:00AM May 19, 2013Observed: 9.94 ft at 4:30AM May 19, 2013Observed: 9.94 ft at 5:00AM May 19, 2013Observed: 9.94 ft at 5:30AM May 19, 2013Observed: 9.94 ft at 6:00AM May 19, 2013Observed: 9.94 ft at 6:30AM May 19, 2013Observed: 9.94 ft at 7:00AM May 19, 2013Observed: 9.94 ft at 7:30AM May 19, 2013Observed: 9.94 ft at 8:00AM May 19, 2013Observed: 9.94 ft at 8:30AM May 19, 2013Observed: 9.95 ft at 9:00AM May 19, 2013Observed: 9.94 ft at 9:30AM May 19, 2013Observed: 9.95 ft at 10:00AM May 19, 2013Observed: 9.95 ft at 10:30AM May 19, 2013Observed: 9.95 ft at 11:00AM May 19, 2013Observed: 9.95 ft at 11:30AM May 19, 2013Observed: 9.95 ft at 12:00PM May 19, 2013Observed: 9.95 ft at 12:30PM May 19, 2013Observed: 9.95 ft at 1:00PM May 19, 2013Observed: 9.95 ft at 1:30PM May 19, 2013Observed: 9.95 ft at 2:00PM May 19, 2013Observed: 9.95 ft at 2:30PM May 19, 2013Highest Observation: 9.96 ft at 3:00PM May 19, 2013Highest Observation: 9.96 ft at 3:30PM May 19, 2013Highest Observation: 9.96 ft at 4:00PM May 19, 2013Highest Observation: 9.96 ft at 4:30PM May 19, 2013Highest Observation: 9.96 ft at 5:00PM May 19, 2013Highest Observation: 9.96 ft at 5:30PM May 19, 2013Forecast: 10 ft 7:00PM May 19, 2013Forecast: 10 ft 1:00AM May 20, 2013Forecast: 10 ft 7:00AM May 20, 2013Forecast: 10 ft 1:00PM May 20, 2013Forecast: 10 ft 7:00PM May 20, 2013Forecast: 10 ft 1:00AM May 21, 2013Forecast: 10 ft 7:00AM May 21, 2013Forecast: 10 ft 1:00PM May 21, 2013Forecast: 10 ft 7:00PM May 21, 2013Forecast: 10 ft 1:00AM May 22, 2013Forecast: 10 ft 7:00AM May 22, 2013Forecast: 10 ft 1:00PM May 22, 2013Forecast: 10 ft 7:00PM May 22, 2013Highest Forecast: 10.1 ft 1:00AM May 23, 2013Highest Forecast: 10.1 ft 7:00AM May 23, 2013Highest Forecast: 10.1 ft 1:00PM May 23, 2013Highest Forecast: 10.1 ft 7:00PM May 23, 2013Highest Forecast: 10.1 ft 1:00AM May 24, 2013Highest Forecast: 10.1 ft 7:00AM May 24, 2013USGS--Water Resources of the United StatesGNDL1(plotting HGIRG) Graph Created (6:54PM May 19, 2013)ObservedForecast (issued 10:04AM May 19)Latest observed value: 9.96 ft at 5:30 PM CDT 19-May-2013. Flood Stage is 15 ft
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About this graph
Tabular Data
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Atchafalaya River at Myette Point/Grand Lake are issued routinely year-round.
Return to Area Map
Upstream Gauge - at Bayou Sorrel Lock Upstream Gauge Downstream Gauge Downstream Gauge - at Morgan City
Flood Categories (in feet)
Major Flood Stage:26
Moderate Flood Stage:20
Flood Stage:15
Action Stage:14

Historical Crests
(1) 17.80 ft on 05/24/1973
(2) 15.58 ft on 05/29/2011
(3) 15.58 ft on 05/28/2011
(4) 14.95 ft on 04/19/1975
(5) 12.97 ft on 02/18/1974
Show More Historical Crests

Low Water Records
(1) -0.76 ft on 09/30/1999
(2) 0.50 ft on 10/09/2000
(3) 0.85 ft on 12/05/2008
Show More Low Water Records
Legend
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
28 AT THIS STAGE, THE WEST ATCHAFALYA BASIN PROTECTION LEVEE WILL BE OVERTOPPED FLOODING PARTS OF THE CITY OF CHARENTON. RIVER NAVIGATION WILL BECOME MORE DIFFICULT AND BOATING CAUTION IS URGED.
26 THE RIVER WILL OVERTOP THE LEVEE AT ITS LOWEST POINTS. SANDBAGGING OF LOW LEVEE SECTIONS FROM CHARENTON DOWNSTREAM TO NEAR FRANKLIN IS RECOMMENDED. RIVER NAVIGATION WILL BECOME MORE DIFFICULT AND BOATING CAUTION IS URGED.
20 RIVER NAVIGATION WILL BECOME MORE DIFFICULT AND BOATING CAUTION IS URGED.
15 ALTHOUGH ON THE FLOODWAY SIDE (FWS) OF THE PROTECTION LEVEE... FLOODING OF THE BATTURE WILL IMPEDE SMALL CRAFT LAUNCHING. NAVIGATION PRECAUTIONS ARE RECOMMENDED.
About This Location Collapse

Latitude: 29.892500° N, Longitude: 91.445556° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 15 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 1.28 ft 16.28 ft  

Other Data Sources:
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Hydrologic Resources Additional Resources
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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
National Weather Service
New Orleans/Baton Rouge Weather Forecast Office
62300 Airport Rd.
Slidell, LA 70460-5243
(504) 522-7330
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Page last modified: 13-Mar-2013 6:27 PM 		Disclaimer
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