MKARNS Nav Notice No. SWL 21-40 Lock 1 Caution Advisory

Little Rock District Operations Technical Services Branch
Published Sept. 17, 2021
Navigation Notice

Navigation Notice

Mariners are advised that shoaling is present in the downstream approach to Norrell Lock (No.1) NM 10.3.  Currently there are locations in the navigation channel that are less than 10 feet deep.  The White River long range forecast indicates decreasing tailwater elevations at Lock 1, which will present unfavorable navigation conditions.  The dredge contractor is currently on site, however, clamming operations are also being considered in order to assist in the effort to maintain the appropriate navigation depths.  Mariners are advised to contact the lock before transiting the area to obtain current conditions.


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 Services Branch

Release no. 21-100