NOTICE TO NAVIGATION INTERESTS
DETROIT DISTRICT DATE: 04/28/2016 NOTICE NUMBER: 6274
ATTN: CELRE-DE
477 MICHIGAN AVENUE
DETROIT MI 48226-2575
HTTP://WWW.LRE.USACE.ARMY.MIL/
POC:

Technical Services Branch
313-226-2384
LOCAL NUMBER: L16-11
WATERWAY: ST. MARYS RIVER

EFFECTIVE: 04/28/2016 14:20 thru UNTIL FURTHER NOTICE EDT
________________________________________________________________________________________________________________________

RESTRICTED VESSEL PASSAGE THROUGH THE MACARTHUR LOCK
ST MARYS FALLS CANAL

 

The following restrictions will be implemented at the MacArthur Lock further notice. These restrictions are required due to embedded gate anchorage concerns on gates 2 and 5. The Mac Arthur Lock will be operated using both upper and lower intermediate gates (gates 3 and 4)

Special Procedures for transiting of the MacArthur Lock by vessels not exceeding 730 feet in length when Gate 5 is out of service.

Upbound Vessels:

Vessels with friction winches and no bow overhang:

Maximum Vessel Length = 730 feet

For vessels 730 feet in length, Boom #8 (the chamber boom) will remain in the raised position while Gate #4 (the lower intermediate gate) is closed.  This will allow 15.5 feet of clearance between the vessel and the upper intermediate gate sill and 25 feet of clearance between the vessel and Gate #4. At the request of the captain, vessels can be moved the last 25 feet to their final position using winch power only.

Vessels without friction winches or with bow overhang:

Maximum Vessel Length = 660 feet

For vessels 660 feet in length,  Boom #8 will be lowered before Gate #4 is closed.  This will provide 30 feet of clearance between the vessel and Boom #8 and 15 feet of clearance between the vessel and the upper gate sill.

Downbound Vessels:

Vessels with friction winches and no bow overhang:

Maximum Vessel Length = 730 feet

For vessels greater than 660 feet, Boom #8 will remain in the lowered position until the vessel is brought to a full stop with wheel motionless or in a zero pitch condition and the check cables out forward and aft.  The vessel must be stopped when the bow of the vessel is no closer than 30 feet from the chamber boom.  The chamber boom will then be raised and the vessel shall be moved forward into final position using winches only.

For vessels 730 feet in length, this will provide for 15.5 feet of clearance between the vessel and the upper gate sill and 25 feet clearance between the vessel and Gate #4.

Vessels without friction winches or with bow overhang:

Maximum Vessel Length = 660 feet

For vessels 660 feet in length, Boom #8 will remain lowered.  This will provide for 30 feet of clearance between the vessel and Boom #8, and will provide 15 feet of clearance between the vessel and the upper gate sill.

 

//signed//


DAVID L. WRIGHT, P.E.
Chief, Operations
USACE-Detroit