0

 0 - No Assist

I

 I - Tow equipped with bow thrusters

J

 J - Barge Only Assisted by Tow Haulage Equipment such as a Winch or Kevel

K

 K - Hydraulic Assist was Used to Assist the Vessel. This consists of opening the lock valves to assist a downbound tow. Only used where authorized.

L

 L - Extra Personnel were Used to Assist the Vessel. These may either be lock operators or vessel personnel who would not ordinarily be assisting the vessel.

N

 N - Tow and Barge Assisted by Tow Haulage Equipment such as a Winch or Kevel

Z

 Z - Other (Remarks)