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Water Levels By:
National Weather
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Mississippi River at IHNC Lock (01340)
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Gage Zero: 0 Ft. GAGE
Record High Stage:17.52 Ft.
Longitude: -90.02743330
Latitude: 29.96441380
River Mile: 92.7
Record High Stage Date: 04/27/1945
Location of Gage :

Located river side of IHNC (Inner Harbor Navigation Canal) lock near river mile 92.7 

Note: Vertical datum set to NAVD88 (2004.65) on Oct 15, 2008;
all prior historic data is relative to NGVD29. 

To adjust prior historic data (from 24Jun1983 to15Oct2008) to NAVD88 (2004.65), subtract 0.97 feet.

To adjust NAVD88 (2004.65) data to NAVD88 (2009.55), subtract 0.11 feet.

To adjust NAVD88 (2009.55) values to 2007 Low Water Reference Plane (LWRP) datum relative to NAVD88, subtract 0.5 ft.

** Raw data, subject to change **

Historic Data Only For This Station
Daily Historic Data
(08:00 Central Reading)
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(Yearly Formatted)
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