MKARNS Nav Notice SWL 15-62 WREC Increased Differentials

Published Sept. 3, 2015
Navigation Notice

Navigation Notice



                                                        MCCLELLAN-KERR ARKANSAS RIVER NAVIGATION SYSTEM

Mariners transiting the White River Entrance Channel (WREC) are advised of increased head differentials between Norrell Lock and Dam and Montgomery Point Lock and Dam.  At 8:00 am today, the tailwater elevation at Norrell Lock and Dam was 123.70 ft-msl and the headwater elevation at Montgomery Point Lock and Dam was 121.15 ft-msl, with a differential of 2.55 feet.  The WREC differential is forecasted to be near 3 feet by September 4th, near 3.5 feet by September 10th, near 4.0 feet by September 18th and near 4.5 feet by October 1st.   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 OTSB
James McKinnie

Release no. SWL 15-62