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This system of markers is used on the Mississippi River and its tributaries above Baton Rouge, Louisiana, and on some other rivers that flow toward the Gulf of Mexico. The major difference from the U.S. Aids to Navigation System lateral markers shown on the previous page is that navigation markers on the Western Rivers System are not numbered. Numbers displayed below daymarks along this system are not associated with the right or left side of the channel; these numbers indicate the distance from the river's mouth (except on the Ohio River where the numbers indicate the distance from the headwaters).

Western Rivers System Daymark
Western Rivers System Marker

 

 

On the Western Rivers System, this daymark indicates the right side of the channel as a boater heads upstream. The number below the marker indicates that the boater is 73.5 miles from the river's mouth.