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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit https://www.weather.gov/owp/operations for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.



Hydrograph River at a Glance Download
Atchafalaya River at Bayou Sorrel Lock Stage (ft)Observed: 2.5 ft at 7:00AM Sep 26, 2023Observed: 2.5 ft at 6:00AM Sep 27, 2023Highest Observation: 2.6 ft at 6:00AM Sep 28, 2023Observed: 2.5 ft at 6:00AM Sep 29, 2023Observed: 2.5 ft at 7:00AM Sep 30, 2023Highest Forecast: 2.5 ft 1:00PM Sep 30, 2023Highest Forecast: 2.5 ft 7:00PM Sep 30, 2023Highest Forecast: 2.5 ft 1:00AM Oct 01, 2023Highest Forecast: 2.5 ft 7:00AM Oct 01, 2023Highest Forecast: 2.5 ft 1:00PM Oct 01, 2023Highest Forecast: 2.5 ft 7:00PM Oct 01, 2023Highest Forecast: 2.5 ft 1:00AM Oct 02, 2023Highest Forecast: 2.5 ft 7:00AM Oct 02, 2023Highest Forecast: 2.5 ft 1:00PM Oct 02, 2023Highest Forecast: 2.5 ft 7:00PM Oct 02, 2023Highest Forecast: 2.5 ft 1:00AM Oct 03, 2023Highest Forecast: 2.5 ft 7:00AM Oct 03, 2023Highest Forecast: 2.5 ft 1:00PM Oct 03, 2023Highest Forecast: 2.5 ft 7:00PM Oct 03, 2023Highest Forecast: 2.5 ft 1:00AM Oct 04, 2023Forecast: 2.4 ft 7:00AM Oct 04, 2023Forecast: 2.4 ft 1:00PM Oct 04, 2023Forecast: 2.4 ft 7:00PM Oct 04, 2023Forecast: 2.4 ft 1:00AM Oct 05, 2023Forecast: 2.4 ft 7:00AM Oct 05, 2023Forecast: 2.4 ft 1:00PM Oct 05, 2023Forecast: 2.4 ft 7:00PM Oct 05, 2023Forecast: 2.4 ft 1:00AM Oct 06, 2023Forecast: 2.4 ft 7:00AM Oct 06, 2023Forecast: 2.4 ft 1:00PM Oct 06, 2023Forecast: 2.4 ft 7:00PM Oct 06, 2023Forecast: 2.4 ft 1:00AM Oct 07, 2023Forecast: 2.4 ft 7:00AM Oct 07, 2023Forecast: 2.4 ft 1:00PM Oct 07, 2023Forecast: 2.4 ft 7:00PM Oct 07, 2023Forecast: 2.4 ft 1:00AM Oct 08, 2023Forecast: 2.4 ft 7:00AM Oct 08, 2023Forecast: 2.4 ft 1:00PM Oct 08, 2023Forecast: 2.4 ft 7:00PM Oct 08, 2023Forecast: 2.4 ft 1:00AM Oct 09, 2023Forecast: 2.4 ft 7:00AM Oct 09, 2023Forecast: 2.4 ft 1:00PM Oct 09, 2023Forecast: 2.4 ft 7:00PM Oct 09, 2023Forecast: 2.4 ft 1:00AM Oct 10, 2023Forecast: 2.3 ft 7:00AM Oct 10, 2023Forecast: 2.3 ft 1:00PM Oct 10, 2023Forecast: 2.3 ft 7:00PM Oct 10, 2023Forecast: 2.3 ft 1:00AM Oct 11, 2023Forecast: 2.3 ft 7:00AM Oct 11, 2023Forecast: 2.3 ft 1:00PM Oct 11, 2023Forecast: 2.3 ft 7:00PM Oct 11, 2023Forecast: 2.3 ft 1:00AM Oct 12, 2023Forecast: 2.3 ft 7:00AM Oct 12, 2023Forecast: 2.3 ft 1:00PM Oct 12, 2023Forecast: 2.3 ft 7:00PM Oct 12, 2023Forecast: 2.3 ft 1:00AM Oct 13, 2023Forecast: 2.3 ft 7:00AM Oct 13, 2023BSRL1(plotting HGIRZ) Graph Created (8:09AM Sep 30, 2023)ObservedForecast (issued 10:37AM Sep 29)Latest observed value: 2.5 ft at 7:00 AM CDT 30-Sep-2023. Flood Stage is 12 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Atchafalaya River at Bayou Sorrel Lock are issued routinely year-round.
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Downstream Gauge Downstream Gauge - at Morgan City
Flood Categories (in feet)
Major Flood Stage: 30
Moderate Flood Stage: 18
Flood Stage: 12
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 18.10 ft on 05/23/1973
(2) 17.40 ft on 05/29/2011
(3) 17.40 ft on 05/28/2011
(4) 13.71 ft on 03/16/2019
(5) 12.90 ft on 01/23/2016
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.71 ft on 03/16/2019
(2) 12.90 ft on 01/23/2016
(3) 17.40 ft on 05/29/2011
(4) 17.40 ft on 05/28/2011
(5) 12.40 ft on 04/28/2008
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 10/18/1976
(2) 0.00 ft on 01/14/1964
(3) 0.80 ft on 12/25/1989
(4) 1.00 ft on 02/16/1977
(5) 1.00 ft on 10/09/2000
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:16
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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.
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If you notice any errors in the below information, please contact our Webmaster
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 Floodway Side (FWS) of the protection levee, recreational activity and navigation on Grand River and the Atchafalaya River main channel may be curtailed because of increased flow.
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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: 2-Nov-2020 7:29 PM
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