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 firstname.lastname@example.org 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.