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Hydrograph River at a Glance Download
Atchafalaya River at Simmesport Stage (ft)Forecast: 23.8 ft 7:00AM Apr 27, 2017Forecast: 23.8 ft 1:00PM Apr 27, 2017Forecast: 23.7 ft 7:00PM Apr 27, 2017Forecast: 23.6 ft 1:00AM Apr 28, 2017Forecast: 23.6 ft 7:00AM Apr 28, 2017Forecast: 23.5 ft 1:00PM Apr 28, 2017Forecast: 23.5 ft 7:00PM Apr 28, 2017Forecast: 23.4 ft 1:00AM Apr 29, 2017Forecast: 23.4 ft 7:00AM Apr 29, 2017Forecast: 23.5 ft 1:00PM Apr 29, 2017Forecast: 23.6 ft 7:00PM Apr 29, 2017Forecast: 23.7 ft 1:00AM Apr 30, 2017Forecast: 23.8 ft 7:00AM Apr 30, 2017Forecast: 23.9 ft 1:00PM Apr 30, 2017Forecast: 24.1 ft 7:00PM Apr 30, 2017Forecast: 24.3 ft 1:00AM May 01, 2017Highest Forecast: 24.5 ft 7:00AM May 01, 2017USGS--Water Resources of the United StatesSMML1(plotting HGIRG) Graph Created (6:07AM Apr 27, 2017)ObservedForecast (issued 10:01AM Apr 26)Latest observed value: 24.01 ft at 5:30 AM CDT 27-Apr-2017. Flood Stage is 47 ft
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Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NGVD29
NOTE: Gauge readings are temporarily unavailable.

NOTE: Forecasts for the Atchafalaya River at Simmesport are issued routinely year-round.

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Downstream Gauge Downstream Gauge - at Melville
Flood Categories (in feet)
Major Flood Stage: 60
Moderate Flood Stage: 50
Flood Stage: 47
Action Stage: 46
Low Stage (in feet): -9999

Historic Crests
(1) 59.13 ft on 05/16/1927
(2) 57.33 ft on 05/16/1922
(3) 57.14 ft on 04/30/1945
(4) 55.83 ft on 05/13/1912
(5) 55.03 ft on 03/01/1937
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(P): Preliminary values subject to further review.

Recent Crests
(1) 25.49 ft on 01/11/2014
(2) 32.66 ft on 05/28/2013
(3) 30.25 ft on 12/27/2011
(4) 44.93 ft on 05/24/2011
(5) 33.74 ft on 02/16/2010
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(P): Preliminary values subject to further review.

Low Water Records
(1) 0.31 ft on 11/08/1891
(2) 0.31 ft on 11/01/1991
(3) 0.70 ft on 10/17/1976
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Zoom Level:16
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Gauge LocationGauge Map Marker
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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61 The river level is at the net grade protection of the levee system
60 The river is at the lowest height of the back ring protection levee around the city of Simmesport
43 The river stage is at the natural ground elevation of areas protected by the levee system
40 There will be flooding of areas outside the levees in the atchafalya floodway
35 Backwater flooding of unprotected areas above Simmesport will begin
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Latitude: 30.982500° N, Longitude: 91.798333° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 47 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 -0.12 ft 46.88 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available 47.00 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
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New Orleans/Baton Rouge Weather Forecast Office
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Slidell, LA 70460-5243
(504) 522-7330
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Page last modified: 21-Dec-2016 5:20 PM
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