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Hydrograph River at a Glance Download
Atchafalaya River at Myette Point/Grand Lake Stage (ft)USGS--Water Resources of the United StatesGNDL1(plotting HGIRG) Graph Created (9:07PM Sep 15, 2019)Flood Stage is 15 ft
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Datum: NGVD29
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: Forecasts for the Atchafalaya River at Myette Point/Grand Lake are issued routinely year-round.

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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
Low Stage (in feet): 0

Historic Crests
(1) 17.80 ft on 05/24/1973
(2) 15.58 ft on 05/28/2011
(3) 14.95 ft on 04/19/1975
(4) 12.97 ft on 02/18/1974
(5) 12.62 ft on 04/26/2008
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(P): Preliminary values subject to further review.

Recent Crests
(1) 8.63 ft on 01/01/2012
(2) 15.58 ft on 05/28/2011
(3) 10.38 ft on 02/17/2010
(4) 11.52 ft on 05/28/2009
(5) 12.62 ft on 04/26/2008
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(P): Preliminary values subject to further review.

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
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Zoom Level:16
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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.
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If you notice any errors in the below information, please contact our Webmaster
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 of the protection levee, flooding of the batture will impede small craft launching. Navigation precautions are recommended.
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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)
(gauge height = flood stage)
Elevation information source
NAVD88 -1.44 ft 13.56 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 -1.28 ft 13.72 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
National Weather Service
Lake Charles Weather Forecast Office
500 Airport Boulevard
Lake Charles, LA 70607
(337) 477-5285
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Page last modified: 1-Mar-2019 12:34 AM
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