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Streamflow Measurements for the Nation

! Streamflow measurement pages will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline and new pages.

USGS 07381490 Atchafalaya River at Simmesport, LA

Avoyelles Parish, Louisiana
Hydrologic Unit Code 08080101
Latitude  30°58'57", Longitude  91°47'54" NAD83
Drainage area 87,570.00  square miles

Period of record
Begin Date End Date Count
2009-10-29 2025-09-25 288

 
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