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Notice: We are experiencing a wide spread communication outage affecting the availability of water level and meteorological data for some of our stations, as well as several critical bridge clearance measurements. We are diligently working to resolve this data outage. Please direct all questions to or call (301) 713-2815.

Low Water Reference Plane

The Low Water Reference Plane (LWRP) on the Mississippi River is used to establish the crown elevation for dikes and other engineering works. It is also used by navigation interests to obtain a general understanding of the depth of water available at critical locations in the river.

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services