MKARNS Navigation Notice - SWL-23-48

Published Aug. 29, 2023
Navigation Notice

Navigation Notice

This is to advise mariners transiting the White River Entrance Channel (WREC) of increased head differentials between Norrell Lock and Dam and Montgomery Point Lock and Dam.  At 13:00 p.m. today, the tailwater elevation at Norrell Lock and Dam was 119.23 ft-msl and the headwater elevation at Montgomery Point Lock and Dam was 115.82 ft-msl with a differential of 3.41 feet. The differential is forecasted to stay above 3.0 feet for the next few days.

Mariners are reminded of advised tow restrictions during increased differentials shown below:


WREC Differential                                                            # Barges


2.9 feet or less                                                                  No restriction


3.0 to 4.4 feet                                                                   12 barge down bound restriction

                                                                                                No restriction up bound


4.5 to 5.0 feet                                                                   9 barge down bound restriction

                                                                                                No up bound restriction


5.1 to 5.9 feet                                                                   4 barge down bound restriction during daylight

                                                                                                2 barge down bound restriction during night

                                                                                                No up bound restriction


Mariners transiting the WREC should use extreme caution in this area, especially when passing Montgomery Point Lock and Dam. Contact Montgomery Point Lock and Dam or Norrell Lock and Dam for current differential and elevations or visit our website at

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

//signed// (for)
Christopher B. Roark
Chief, Operations Division

(501) 324-5096

Release no. 23-097