Navigation Notice: Upper Mississippi River

IENC Chart Update
Dikes 290.1R, 289.7R & 289.4R
Upper Mississippi River mile 290.1 - 289.4


NOTICE NUMBER: 19126 / 22-02
EFFECTIVE: 03/23/2022 00:00 thru 06/30/2022 23:59 CDT


  1. Dikes 290.1R, 289.7R, and 289.4R were found on a recent multibeam survey to be longer than previously shown on the Inland Electronic Navigation Chart (IENC).  Dike 290.1R is extended 220-ft, dike 289.7R is extended 450-ft, and dike 289.4R is extended 475-ft towards the channel with less than 5-ft of water over these areas.  The IENC has been updated to show the actual length of these structures.
  2. The attached drawing shows the updated IENC chart with the old end of dike locations noted for comparison.
  3. Mariners should update IENC U37UM218 on their electronic chart software.





Andrew C. Schimpf, P.E.
Rivers Project Manager