MKARNS Nav Notice SWL 16-27 WREC Increased Differentials

Published March 28, 2016
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 12:00 noon today, the tailwater elevation at Norrell Lock and Dam was 144.61 ft-msl and the headwater elevation at Montgomery Point Lock and Dam was 141.87 ft-msl with a differential of 2.74 feet.  The WREC differential is forecasted to be 3 feet tomorrow and will remain above 3 feet for at least four days.  Mariners are reminded of advised tow restrictions during increased differentials:


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 James McKinnie in the Little Rock District Office, at (501) 324-5739 or (501) 324-5096, or you may email



Kevin J. McDaniels

Chief, Operations Division

Little Rock District Operations Technical Support Branch
James McKinnie

Release no. SWL 16-027