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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
Hydrograph River at a Glance Download Weekly Chance of
Exceeding Levels		 Chance of Exceeding Levels
During Entire Period
Atchafalaya River at Bayou Sorrel Lock Stage (ft)Highest Observation: 8.7 ft at 7:00AM May 16, 2013Highest Observation: 8.7 ft at 7:00AM May 17, 2013Highest Observation: 8.7 ft at 7:00AM May 18, 2013Highest Forecast: 8.8 ft 1:00AM May 19, 2013Highest Forecast: 8.8 ft 7:00AM May 19, 2013Highest Forecast: 8.8 ft 1:00PM May 19, 2013Highest Forecast: 8.8 ft 7:00PM May 19, 2013Highest Forecast: 8.8 ft 1:00AM May 20, 2013Highest Forecast: 8.8 ft 7:00AM May 20, 2013Highest Forecast: 8.8 ft 1:00PM May 20, 2013Highest Forecast: 8.8 ft 7:00PM May 20, 2013Highest Forecast: 8.8 ft 1:00AM May 21, 2013Highest Forecast: 8.8 ft 7:00AM May 21, 2013Highest Forecast: 8.8 ft 1:00PM May 21, 2013Highest Forecast: 8.8 ft 7:00PM May 21, 2013Highest Forecast: 8.8 ft 1:00AM May 22, 2013Highest Forecast: 8.8 ft 7:00AM May 22, 2013Highest Forecast: 8.8 ft 1:00PM May 22, 2013Highest Forecast: 8.8 ft 7:00PM May 22, 2013Highest Forecast: 8.8 ft 1:00AM May 23, 2013Highest Forecast: 8.8 ft 7:00AM May 23, 2013BSRL1(plotting HGIRZ) Graph Created (8:34PM May 18, 2013)ObservedForecast (issued 10:00AM May 18)Latest observed value: 8.7 ft at 7:00 AM CDT 18-May-2013. Flood Stage is 12 ft
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NOTE: Forecasts for the Atchafalaya River at Bayou Sorrel Lock are issued routinely year-round.
Return to Area Map
Upstream Gauge - above Butte La Rose Upstream Gauge Downstream Gauge Downstream Gauge - at Myette Point/Grand Lake
Flood Categories (in feet)
Major Flood Stage:30
Moderate Flood Stage:18
Flood Stage:12
Action Stage:10

Historical Crests
(1) 18.10 ft on 05/23/1973
(2) 17.40 ft on 05/28/2011
(3) 17.40 ft on 05/29/2011
(4) 12.40 ft on 06/05/1983
(5) 12.00 ft on 03/31/1997
Show More Historical Crests

Low Water Records
(1) 0.00 ft on 01/14/1964
(2) 0.00 ft on 10/18/1976
(3) 0.80 ft on 12/25/1989
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
30 THE TOP OF THE LEVEE PROTECTING THE TOWN OF BAYOU SORREL WILL BE REACHED. EVACUATION IS STRONGLY RECOMMENDED
18 OVER 500,000 ACRES ON THE FLOODWAY SIDE OF THE LEVEE WILL BE INUNDATED. RECREATIONAL AREAS WILL BE CLOSED
12 ON THE FLOOD WAY SIDE (FWS) OF THE PROTECTION LEVEE... RECREATIONAL ACTIVITY AND NAVIGATION ON GRAND RIVER AND THE ATCHAFALAYA MAIN CHANNEL MAY BE CURTAILED BECAUSE OF INCREASED FLOW.
About This Location Collapse

Latitude: 30.130000° N, Longitude: 91.322500° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 12 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 0 ft 12 ft 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 Not Available Not Available  
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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 6:33 PM 		Disclaimer
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