MKARNS Nav Notice No. 21-41 Lock 1 DS Approach

Little Rock District Operations Technical Support
Published Sept. 20, 2021
Navigation Notice

Navigation Notice

Due to the rapid drop of water levels in the Mississippi River and shoaling at NM 9.9 in the downstream approach to Norrell Lock (No.1) NM 10.3, the navigation channel is currently impassable to commercial tows.  Clamming operations have started in the area, however there is no estimate on when the channel will be passable.  An additional navigation notice will be submitted when the channel is open for navigation.


Questions or requests for additional information concerning this notice should be directed to the Little Rock District Office, at (501) 324-5096 or you may email



Christopher B. Roark

Chief, Operations Division

Little Rock District Operations Technical Support

Release no. 21-102