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Hydrograph River at a Glance Download
Atchafalaya River at Simmesport Stage (ft)Observed: 29.33 ft at 2:00AM Apr 20, 2014Observed: 29.28 ft at 2:15AM Apr 20, 2014Observed: 29.32 ft at 2:30AM Apr 20, 2014Observed: 29.26 ft at 2:45AM Apr 20, 2014Observed: 29.31 ft at 3:00AM Apr 20, 2014Observed: 29.31 ft at 3:15AM Apr 20, 2014Observed: 29.31 ft at 3:30AM Apr 20, 2014Observed: 29.28 ft at 3:45AM Apr 20, 2014Observed: 29.28 ft at 4:00AM Apr 20, 2014Observed: 29.3 ft at 4:15AM Apr 20, 2014Observed: 29.32 ft at 4:30AM Apr 20, 2014Observed: 29.29 ft at 4:45AM Apr 20, 2014Observed: 29.28 ft at 5:00AM Apr 20, 2014Observed: 29.28 ft at 5:15AM Apr 20, 2014Observed: 29.28 ft at 5:30AM Apr 20, 2014Observed: 29.28 ft at 5:45AM Apr 20, 2014Observed: 29.3 ft at 6:00AM Apr 20, 2014Observed: 29.3 ft at 6:15AM Apr 20, 2014Observed: 29.32 ft at 6:30AM Apr 20, 2014Observed: 29.27 ft at 6:45AM Apr 20, 2014Observed: 29.33 ft at 7:00AM Apr 20, 2014Observed: 29.26 ft at 7:15AM Apr 20, 2014Observed: 29.31 ft at 7:30AM Apr 20, 2014Observed: 29.29 ft at 7:45AM Apr 20, 2014Observed: 29.3 ft at 8:00AM Apr 20, 2014Observed: 29.29 ft at 8:15AM Apr 20, 2014Observed: 29.31 ft at 8:30AM Apr 20, 2014Observed: 29.29 ft at 8:45AM Apr 20, 2014Observed: 29.26 ft at 9:00AM Apr 20, 2014Observed: 29.25 ft at 9:15AM Apr 20, 2014Observed: 29.27 ft at 9:30AM Apr 20, 2014Observed: 29.3 ft at 9:45AM Apr 20, 2014Observed: 29.28 ft at 10:00AM Apr 20, 2014Observed: 29.29 ft at 10:15AM Apr 20, 2014Observed: 29.27 ft at 10:30AM Apr 20, 2014Observed: 29.18 ft at 10:45AM Apr 20, 2014Observed: 29.15 ft at 11:00AM Apr 20, 2014Observed: 29.06 ft at 11:15AM Apr 20, 2014Observed: 29.07 ft at 11:30AM Apr 20, 2014Observed: 28.97 ft at 11:45AM Apr 20, 2014Observed: 28.94 ft at 12:00PM Apr 20, 2014Observed: 28.95 ft at 12:15PM Apr 20, 2014Observed: 28.91 ft at 12:30PM Apr 20, 2014Observed: 28.8 ft at 12:45PM Apr 20, 2014Observed: 28.94 ft at 1:00PM Apr 20, 2014Observed: 28.97 ft at 1:15PM Apr 20, 2014Observed: 28.9 ft at 1:30PM Apr 20, 2014Observed: 28.98 ft at 1:45PM Apr 20, 2014Observed: 28.97 ft at 2:00PM Apr 20, 2014Observed: 28.97 ft at 2:15PM Apr 20, 2014Observed: 28.99 ft at 2:30PM Apr 20, 2014Observed: 28.98 ft at 2:45PM Apr 20, 2014Observed: 29.01 ft at 3:00PM Apr 20, 2014Observed: 29.03 ft at 3:15PM Apr 20, 2014Observed: 29.02 ft at 3:30PM Apr 20, 2014Observed: 29.01 ft at 3:45PM Apr 20, 2014Observed: 29.04 ft at 4:00PM Apr 20, 2014Observed: 29.04 ft at 4:15PM Apr 20, 2014Observed: 29.04 ft at 4:30PM Apr 20, 2014Observed: 29.08 ft at 4:45PM Apr 20, 2014Observed: 29.1 ft at 5:00PM Apr 20, 2014Observed: 29.07 ft at 5:15PM Apr 20, 2014Observed: 29.08 ft at 5:30PM Apr 20, 2014Observed: 29.07 ft at 5:45PM Apr 20, 2014Observed: 29.08 ft at 6:00PM Apr 20, 2014Observed: 29.1 ft at 6:15PM Apr 20, 2014Observed: 29.1 ft at 6:30PM Apr 20, 2014Observed: 29.1 ft at 6:45PM Apr 20, 2014Observed: 29.11 ft at 7:00PM Apr 20, 2014Observed: 29.09 ft at 7:15PM Apr 20, 2014Observed: 29.09 ft at 7:30PM Apr 20, 2014Observed: 29.11 ft at 7:45PM Apr 20, 2014Observed: 29.09 ft at 8:00PM Apr 20, 2014Observed: 29.12 ft at 8:15PM Apr 20, 2014Observed: 29.15 ft at 8:30PM Apr 20, 2014Observed: 29.12 ft at 8:45PM Apr 20, 2014Observed: 29.16 ft at 9:00PM Apr 20, 2014Observed: 29.14 ft at 9:15PM Apr 20, 2014Observed: 29.11 ft at 9:30PM Apr 20, 2014Observed: 29.16 ft at 9:45PM Apr 20, 2014Observed: 29.13 ft at 10:00PM Apr 20, 2014Observed: 29.14 ft at 10:15PM Apr 20, 2014Observed: 29.1 ft at 10:30PM Apr 20, 2014Observed: 29.11 ft at 10:45PM Apr 20, 2014Observed: 29.14 ft at 11:00PM Apr 20, 2014Observed: 29.16 ft at 11:15PM Apr 20, 2014Observed: 29.15 ft at 11:30PM Apr 20, 2014Observed: 29.14 ft at 11:45PM Apr 20, 2014Observed: 29.16 ft at 12:00AM Apr 21, 2014Observed: 29.17 ft at 12:15AM Apr 21, 2014Observed: 29.21 ft at 12:30AM Apr 21, 2014Observed: 29.17 ft at 12:45AM Apr 21, 2014Observed: 29.15 ft at 1:00AM Apr 21, 2014Observed: 29.14 ft at 1:15AM Apr 21, 2014Observed: 29.14 ft at 1:30AM Apr 21, 2014Observed: 29.16 ft at 1:45AM Apr 21, 2014Observed: 29.17 ft at 2:00AM Apr 21, 2014Observed: 29.17 ft at 2:15AM Apr 21, 2014Observed: 29.18 ft at 2:30AM Apr 21, 2014Observed: 29.16 ft at 2:45AM Apr 21, 2014Observed: 29.17 ft at 3:00AM Apr 21, 2014Observed: 29.16 ft at 3:15AM Apr 21, 2014Observed: 29.17 ft at 3:30AM Apr 21, 2014Observed: 29.14 ft at 3:45AM Apr 21, 2014Observed: 29.17 ft at 4:00AM Apr 21, 2014Observed: 29.18 ft at 4:15AM Apr 21, 2014Observed: 29.17 ft at 4:30AM Apr 21, 2014Observed: 29.17 ft at 4:45AM Apr 21, 2014Observed: 29.16 ft at 5:00AM Apr 21, 2014Observed: 29.16 ft at 5:15AM Apr 21, 2014Observed: 29.14 ft at 5:30AM Apr 21, 2014Observed: 29.16 ft at 5:45AM Apr 21, 2014Observed: 29.17 ft at 6:00AM Apr 21, 2014Observed: 29.13 ft at 6:15AM Apr 21, 2014Observed: 29.2 ft at 6:30AM Apr 21, 2014Observed: 29.16 ft at 6:45AM Apr 21, 2014Observed: 29.14 ft at 7:00AM Apr 21, 2014Observed: 29.15 ft at 7:15AM Apr 21, 2014Observed: 29.15 ft at 7:30AM Apr 21, 2014Observed: 29.14 ft at 7:45AM Apr 21, 2014Observed: 29.15 ft at 8:00AM Apr 21, 2014Observed: 29.16 ft at 8:15AM Apr 21, 2014Observed: 29.14 ft at 8:30AM Apr 21, 2014Observed: 29.08 ft at 8:45AM Apr 21, 2014Observed: 29.13 ft at 9:00AM Apr 21, 2014Observed: 29.13 ft at 9:15AM Apr 21, 2014Observed: 29.13 ft at 9:30AM Apr 21, 2014Observed: 29.1 ft at 9:45AM Apr 21, 2014Observed: 29.07 ft at 10:00AM Apr 21, 2014Observed: 29.01 ft at 10:15AM Apr 21, 2014Observed: 29.06 ft at 10:30AM Apr 21, 2014Observed: 28.96 ft at 10:45AM Apr 21, 2014Observed: 28.85 ft at 11:00AM Apr 21, 2014Observed: 28.77 ft at 11:15AM Apr 21, 2014Observed: 28.74 ft at 11:30AM Apr 21, 2014Observed: 28.72 ft at 11:45AM Apr 21, 2014Observed: 28.73 ft at 12:00PM Apr 21, 2014Observed: 28.76 ft at 12:15PM Apr 21, 2014Observed: 28.82 ft at 12:30PM Apr 21, 2014Observed: 28.83 ft at 12:45PM Apr 21, 2014Observed: 28.83 ft at 1:00PM Apr 21, 2014Observed: 28.64 ft at 1:15PM Apr 21, 2014Observed: 28.68 ft at 1:30PM Apr 21, 2014Observed: 28.67 ft at 1:45PM Apr 21, 2014Observed: 28.66 ft at 2:00PM Apr 21, 2014Observed: 28.58 ft at 2:15PM Apr 21, 2014Observed: 28.55 ft at 2:30PM Apr 21, 2014Observed: 28.56 ft at 2:45PM Apr 21, 2014Observed: 28.53 ft at 3:00PM Apr 21, 2014Observed: 28.52 ft at 3:15PM Apr 21, 2014Observed: 28.47 ft at 3:30PM Apr 21, 2014Observed: 28.57 ft at 3:45PM Apr 21, 2014Observed: 28.67 ft at 4:00PM Apr 21, 2014Observed: 28.6 ft at 4:15PM Apr 21, 2014Observed: 28.66 ft at 4:30PM Apr 21, 2014Observed: 28.77 ft at 4:45PM Apr 21, 2014Observed: 28.69 ft at 5:00PM Apr 21, 2014Observed: 28.72 ft at 5:15PM Apr 21, 2014Observed: 28.77 ft at 5:30PM Apr 21, 2014Observed: 28.82 ft at 5:45PM Apr 21, 2014Observed: 28.78 ft at 6:00PM Apr 21, 2014Observed: 28.79 ft at 6:15PM Apr 21, 2014Observed: 28.81 ft at 6:30PM Apr 21, 2014Observed: 28.81 ft at 6:45PM Apr 21, 2014Observed: 28.85 ft at 7:00PM Apr 21, 2014Observed: 28.94 ft at 7:15PM Apr 21, 2014Observed: 28.92 ft at 7:30PM Apr 21, 2014Observed: 28.95 ft at 7:45PM Apr 21, 2014Observed: 28.94 ft at 8:00PM Apr 21, 2014Observed: 28.94 ft at 8:15PM Apr 21, 2014Observed: 28.92 ft at 8:30PM Apr 21, 2014Observed: 28.97 ft at 8:45PM Apr 21, 2014Observed: 28.98 ft at 9:00PM Apr 21, 2014Observed: 28.98 ft at 9:15PM Apr 21, 2014Observed: 28.98 ft at 9:30PM Apr 21, 2014Observed: 29 ft at 9:45PM Apr 21, 2014Observed: 29.04 ft at 10:00PM Apr 21, 2014Observed: 29.02 ft at 10:15PM Apr 21, 2014Observed: 29.02 ft at 10:30PM Apr 21, 2014Observed: 29.02 ft at 10:45PM Apr 21, 2014Observed: 29.04 ft at 11:00PM Apr 21, 2014Observed: 29.05 ft at 11:15PM Apr 21, 2014Observed: 29.02 ft at 11:30PM Apr 21, 2014Observed: 29.01 ft at 11:45PM Apr 21, 2014Observed: 29.06 ft at 12:00AM Apr 22, 2014Observed: 29.03 ft at 12:15AM Apr 22, 2014Observed: 29.06 ft at 12:30AM Apr 22, 2014Observed: 29.08 ft at 12:45AM Apr 22, 2014Observed: 29.07 ft at 1:00AM Apr 22, 2014Observed: 29.06 ft at 1:15AM Apr 22, 2014Observed: 29.09 ft at 1:30AM Apr 22, 2014Observed: 29.1 ft at 1:45AM Apr 22, 2014Observed: 29.1 ft at 2:00AM Apr 22, 2014Observed: 29.1 ft at 2:15AM Apr 22, 2014Observed: 29.1 ft at 2:30AM Apr 22, 2014Observed: 29.06 ft at 2:45AM Apr 22, 2014Observed: 29.1 ft at 3:00AM Apr 22, 2014Observed: 29.12 ft at 3:15AM Apr 22, 2014Observed: 29.07 ft at 3:30AM Apr 22, 2014Observed: 29.09 ft at 3:45AM Apr 22, 2014Observed: 29.12 ft at 4:00AM Apr 22, 2014Observed: 29.14 ft at 4:15AM Apr 22, 2014Observed: 29.13 ft at 4:30AM Apr 22, 2014Observed: 29.12 ft at 4:45AM Apr 22, 2014Observed: 29.09 ft at 5:00AM Apr 22, 2014Observed: 29.11 ft at 5:15AM Apr 22, 2014Observed: 29.12 ft at 5:30AM Apr 22, 2014Observed: 29.14 ft at 5:45AM Apr 22, 2014Observed: 29.1 ft at 6:00AM Apr 22, 2014Observed: 29.11 ft at 6:15AM Apr 22, 2014Observed: 29.08 ft at 6:30AM Apr 22, 2014Observed: 29.07 ft at 6:45AM Apr 22, 2014Observed: 29.06 ft at 7:00AM Apr 22, 2014Observed: 29.08 ft at 7:15AM Apr 22, 2014Observed: 29.08 ft at 7:30AM Apr 22, 2014Observed: 29.05 ft at 7:45AM Apr 22, 2014Observed: 29.09 ft at 8:00AM Apr 22, 2014Observed: 29.08 ft at 8:15AM Apr 22, 2014Observed: 29.1 ft at 8:30AM Apr 22, 2014Observed: 29.11 ft at 8:45AM Apr 22, 2014Observed: 29.13 ft at 9:00AM Apr 22, 2014Observed: 29.13 ft at 9:15AM Apr 22, 2014Observed: 29.14 ft at 9:30AM Apr 22, 2014Observed: 29.14 ft at 9:45AM Apr 22, 2014Observed: 29.12 ft at 10:00AM Apr 22, 2014Observed: 29.11 ft at 10:15AM Apr 22, 2014Observed: 29.02 ft at 10:30AM Apr 22, 2014Observed: 28.96 ft at 10:45AM Apr 22, 2014Observed: 28.85 ft at 11:00AM Apr 22, 2014Observed: 28.94 ft at 11:15AM Apr 22, 2014Observed: 28.97 ft at 11:30AM Apr 22, 2014Observed: 29.06 ft at 11:45AM Apr 22, 2014Observed: 29.04 ft at 12:00PM Apr 22, 2014Observed: 29.06 ft at 12:15PM Apr 22, 2014Observed: 29.06 ft at 12:30PM Apr 22, 2014Observed: 29.09 ft at 12:45PM Apr 22, 2014Observed: 29.11 ft at 1:00PM Apr 22, 2014Observed: 29.14 ft at 1:15PM Apr 22, 2014Observed: 28.99 ft at 1:30PM Apr 22, 2014Observed: 28.97 ft at 1:45PM Apr 22, 2014Observed: 29.01 ft at 2:00PM Apr 22, 2014Observed: 28.95 ft at 2:15PM Apr 22, 2014Observed: 28.91 ft at 2:30PM Apr 22, 2014Observed: 28.9 ft at 2:45PM Apr 22, 2014Observed: 28.85 ft at 3:00PM Apr 22, 2014Observed: 28.96 ft at 3:15PM Apr 22, 2014Observed: 29 ft at 3:30PM Apr 22, 2014Observed: 29.04 ft at 3:45PM Apr 22, 2014Observed: 29.07 ft at 4:00PM Apr 22, 2014Observed: 29.08 ft at 4:15PM Apr 22, 2014Observed: 29.09 ft at 4:30PM Apr 22, 2014Observed: 29.11 ft at 4:45PM Apr 22, 2014Observed: 29.08 ft at 5:00PM Apr 22, 2014Observed: 29.1 ft at 5:15PM Apr 22, 2014Observed: 29.14 ft at 5:30PM Apr 22, 2014Observed: 29.14 ft at 5:45PM Apr 22, 2014Observed: 29.18 ft at 6:00PM Apr 22, 2014Observed: 29.19 ft at 6:15PM Apr 22, 2014Observed: 29.17 ft at 6:30PM Apr 22, 2014Observed: 29.2 ft at 6:45PM Apr 22, 2014Observed: 29.2 ft at 7:00PM Apr 22, 2014Observed: 29.21 ft at 7:15PM Apr 22, 2014Observed: 29.23 ft at 7:30PM Apr 22, 2014Observed: 29.27 ft at 7:45PM Apr 22, 2014Observed: 29.27 ft at 8:00PM Apr 22, 2014Observed: 29.25 ft at 8:15PM Apr 22, 2014Observed: 29.28 ft at 8:30PM Apr 22, 2014Observed: 29.27 ft at 8:45PM Apr 22, 2014Observed: 29.28 ft at 9:00PM Apr 22, 2014Observed: 29.31 ft at 9:15PM Apr 22, 2014Observed: 29.31 ft at 9:30PM Apr 22, 2014Observed: 29.31 ft at 9:45PM Apr 22, 2014Observed: 29.3 ft at 10:00PM Apr 22, 2014Observed: 29.3 ft at 10:15PM Apr 22, 2014Observed: 29.32 ft at 10:30PM Apr 22, 2014Observed: 29.36 ft at 10:45PM Apr 22, 2014Observed: 29.34 ft at 11:00PM Apr 22, 2014Observed: 29.36 ft at 11:15PM Apr 22, 2014Observed: 29.37 ft at 11:30PM Apr 22, 2014Highest Observation: 29.38 ft at 11:45PM Apr 22, 2014Observed: 29.35 ft at 12:00AM Apr 23, 2014Observed: 29.35 ft at 12:15AM Apr 23, 2014Observed: 29.36 ft at 12:30AM Apr 23, 2014Highest Observation: 29.38 ft at 12:45AM Apr 23, 2014Highest Forecast: 29.1 ft 7:00AM Apr 23, 2014Highest Forecast: 29.1 ft 1:00PM Apr 23, 2014Highest Forecast: 29.1 ft 7:00PM Apr 23, 2014Highest Forecast: 29.1 ft 1:00AM Apr 24, 2014Forecast: 29 ft 7:00AM Apr 24, 2014Forecast: 29 ft 1:00PM Apr 24, 2014Forecast: 28.9 ft 7:00PM Apr 24, 2014Forecast: 28.8 ft 1:00AM Apr 25, 2014Forecast: 28.7 ft 7:00AM Apr 25, 2014Forecast: 28.7 ft 1:00PM Apr 25, 2014Forecast: 28.6 ft 7:00PM Apr 25, 2014Forecast: 28.5 ft 1:00AM Apr 26, 2014Forecast: 28.4 ft 7:00AM Apr 26, 2014Forecast: 28.2 ft 1:00PM Apr 26, 2014Forecast: 28.1 ft 7:00PM Apr 26, 2014Forecast: 28 ft 1:00AM Apr 27, 2014Forecast: 27.9 ft 7:00AM Apr 27, 2014USGS--Water Resources of the United StatesSMML1(plotting HGIRG) Graph Created (1:50AM Apr 23, 2014)ObservedForecast (issued 9:51AM Apr 22)Latest observed value: 29.38 ft at 12:45 AM CDT 23-Apr-2014. Flood Stage is 47 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CDT)
XML Data
RSS Files
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
Show More Historical Crests

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
Show More Low Water Records
Zoom Level: 16
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
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
About This Location Collapse

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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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
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Slidell, LA 70460-5243
(504) 522-7330
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Page last modified: 8-Apr-2014 7:37 AM
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