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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 05587500 Mississippi River at Alton, IL


Madison County, Illinois
Hydrologic Unit Code 07110009
Latitude  38°53'06", Longitude  90°10'51" NAD27
Drainage area 171,500  square miles
Gage datum 403 feet above NAVD88
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Meas.
Number
  Date       Time Time
Datum
Measurement
Used?
  Who Measuring
Agency
Stream
flow
(ft3/s)
Gage
Height
(ft)
GH
Change
(ft)
Meas.
Duration
(hr)
Meas.
Rated
  Control Flow
Adjust.
Code
 
5122008-06-26 09:35CDTYeskoe/rjUSGS45000028.90 Fair NONE
5111986-10-07 -- ----YesRNN/LGHUSGS35000078.300.142.90Fair NONE
5101986-07-15 -- ----YesRNN/SRFUSGS24500027.260.072.90GoodDebrisModerateNONE
5091985-10-07 -- ----YesLGHUSGS10700056.660.022.60Fair NONE