MKARNS Nav Notice SWL 20-54 Increased Differentials on the WREC

Published Aug. 30, 2020
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 1:00 PM today, the tailwater elevation at Norrell Lock and Dam was 124.89 ft-msl and the headwater elevation at Montgomery Point Lock and Dam was 122.35 ft-msl with a differential of 2.54 feet.  The WREC differential is forecasted to be 3 feet on Sunday, August 30th and could possibly increase to 3.5 feet by Tuesday, September 1st.  The differentials are expected to remain above 3 feet for approximately 9 or 10 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 the Little Rock District Office, at (501) 324-5739 or you may email <> .


Brinda J. Jackson, R.A., PMP

Chief (Acting), Operations Division

Little Rock District Operations Technical Support Branch

Release no. 20-102