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Hydrograph River at a Glance Download
Atchafalaya River at Simmesport Stage (ft)Forecast: 17.7 ft 7:00PM Jul 24, 2014Forecast: 17.7 ft 1:00AM Jul 25, 2014Forecast: 17.7 ft 7:00AM Jul 25, 2014Highest Forecast: 17.8 ft 1:00PM Jul 25, 2014Highest Forecast: 17.8 ft 7:00PM Jul 25, 2014Forecast: 17.7 ft 1:00AM Jul 26, 2014Forecast: 17.6 ft 7:00AM Jul 26, 2014Forecast: 17.5 ft 1:00PM Jul 26, 2014Forecast: 17.5 ft 7:00PM Jul 26, 2014Forecast: 17.4 ft 1:00AM Jul 27, 2014Forecast: 17.3 ft 7:00AM Jul 27, 2014Forecast: 17.2 ft 1:00PM Jul 27, 2014Forecast: 17.1 ft 7:00PM Jul 27, 2014Forecast: 17 ft 1:00AM Jul 28, 2014Forecast: 16.9 ft 7:00AM Jul 28, 2014Forecast: 16.8 ft 1:00PM Jul 28, 2014Forecast: 16.6 ft 7:00PM Jul 28, 2014Forecast: 16.5 ft 1:00AM Jul 29, 2014Forecast: 16.4 ft 7:00AM Jul 29, 2014USGS--Water Resources of the United StatesSMML1(plotting HGIRG) Graph Created (2:20PM Jul 24, 2014)Forecast (issued 10:42AM Jul 24)Flood Stage is 47 ft
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Tabular Data (UTC)
Tabular Data (CDT)
XML Data
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Datum: NGVD29
Metadata
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
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
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)
Elevation
(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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Page last modified: 16-Jul-2014 12:47 AM
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