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Hydrograph River at a Glance Download
Atchafalaya River at Simmesport Stage (ft)Observed: 13.18 ft at 9:00AM Sep 27, 2014Observed: 13.14 ft at 10:00AM Sep 27, 2014Observed: 13.13 ft at 11:00AM Sep 27, 2014Observed: 13.1 ft at 12:00PM Sep 27, 2014Observed: 13.09 ft at 1:00PM Sep 27, 2014Observed: 13.05 ft at 2:00PM Sep 27, 2014Observed: 13.01 ft at 3:00PM Sep 27, 2014Observed: 13.02 ft at 4:00PM Sep 27, 2014Observed: 13.03 ft at 5:00PM Sep 27, 2014Observed: 13.02 ft at 6:00PM Sep 27, 2014Observed: 12.97 ft at 7:00PM Sep 27, 2014Observed: 12.99 ft at 8:00PM Sep 27, 2014Observed: 12.99 ft at 9:00PM Sep 27, 2014Observed: 12.95 ft at 10:00PM Sep 27, 2014Observed: 12.97 ft at 11:00PM Sep 27, 2014Observed: 12.99 ft at 12:00AM Sep 28, 2014Observed: 13 ft at 1:00AM Sep 28, 2014Observed: 12.97 ft at 2:00AM Sep 28, 2014Observed: 12.97 ft at 3:00AM Sep 28, 2014Observed: 12.96 ft at 4:00AM Sep 28, 2014Highest Observation: 78.6 ft at 10:00PM Sep 28, 2014Highest Observation: 78.6 ft at 10:15PM Sep 28, 2014Observed: 78.59 ft at 10:30PM Sep 28, 2014Highest Observation: 78.6 ft at 10:45PM Sep 28, 2014Observed: 78.57 ft at 12:00PM Sep 29, 2014Observed: 78.55 ft at 12:15PM Sep 29, 2014Observed: 78.57 ft at 12:30PM Sep 29, 2014Observed: 78.55 ft at 12:45PM Sep 29, 2014Highest Forecast: 11.3 ft 1:00PM Sep 30, 2014Forecast: 11.1 ft 7:00PM Sep 30, 2014Forecast: 11 ft 1:00AM Oct 01, 2014Forecast: 10.9 ft 7:00AM Oct 01, 2014Forecast: 10.7 ft 1:00PM Oct 01, 2014Forecast: 10.5 ft 7:00PM Oct 01, 2014Forecast: 10.3 ft 1:00AM Oct 02, 2014Forecast: 10.3 ft 7:00AM Oct 02, 2014Forecast: 10.3 ft 1:00PM Oct 02, 2014Forecast: 10.2 ft 7:00PM Oct 02, 2014Forecast: 10.2 ft 1:00AM Oct 03, 2014Forecast: 10.1 ft 7:00AM Oct 03, 2014Forecast: 10.1 ft 1:00PM Oct 03, 2014Forecast: 10.1 ft 7:00PM Oct 03, 2014Forecast: 10 ft 1:00AM Oct 04, 2014Forecast: 10 ft 7:00AM Oct 04, 2014USGS--Water Resources of the United StatesSMML1(plotting HGIRG) Graph Created (8:50AM Sep 30, 2014)ObservedForecast (issued 10:13AM Sep 29)Latest observed value: 78.55 ft at 12:45 PM CDT 29-Sep-2014. Flood Stage is 47 ft
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Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
Datum: NGVD29
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

Historical 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.

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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Slidell, LA 70460-5243
(504) 522-7330
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Page last modified: 27-Aug-2014 7:11 PM
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