ITCS Memo# 2426 - USACE Repair Schedule for Remainder of 2006 for the Illinois And UMR

To: RIAC
From: RIAC Chairman
Date: 9/14/06
Subject: USACE Repair Schedule for Remainder of 2006 for the Illinois And UMR
ITCS Memo # 2426

MISSISSIPPI VALLEY DIVISION

Repair/Maintenance Schedule for 2006

Illinois Waterway
(Rock Island District)

Mile 326.5 - 80.2 There are no long-term closures scheduled for the Illinois Waterway during the 2006/07 season.

Mississippi River River

Project Repairs Dates Remarks

Mile 815.2 Lock 2 Lock dewatering, concrete and 4 Dec 06 - 1Mar 07 Work to be performed in non-navigation
(St. Paul District) structural repairs season
752.8 Lock 4 Installation of lock bulkhead 4 Dec 06 - 1 Mar 07 Work to be performed in non-navigation
(St. Paul District) slots and cover structures season (contingent on funding)
647.9 Lock 9 Installation of lock bulkhead 4 Dec 06 - 1 Mar 07 Work to be performed in non-navigation
(St. Paul District) slots and cover structures season
615.0 Lock 10 Major Rehabilitation of lock 25 Apr 05 - 30 Aug 08 Guidewall and vertical Lockwall concrete
(St. Paul District) site, lockwalls and guidewalls rehab work to be performed in
non-navigation season
583.0 Lock 11 Major Rehabilitation of lock 2 Jan 07- 28 Feb 07 Rehabilitation of lower guidewall

LOCK AND DAM No. 18, UMR Mile 410.5, will be closed to all navigation from 0700 to 1800 hours on both 12 and 13 September 2006 for the purpose of replacing the spare miter gates with the repaired #1 and #4 service gates.

LOCK AND DAM No. 24, UMR Mile 273
Closure 1 (48 Hrs). This closure is to accommodate the drilling, installation and grouting of the pipe piles. These activities will require little to no wave wash or large velocities as the placement of the pile is critical for proper alignment of the cell.

Closure 2 (72 Hrs). This closure is to accommodate the installation of the steel cell and placement of the first lift of concrete. For the placement of the cell onto the guide piles, this is considered a heavy lift and will possibly require two barge-mounted cranes to set the cell. Staging areas for these barges during the placement of the cell may restrict access to the main lock. Also, any wave wash or large velocities could create a hazardous condition during the heavy lift.

Closure 3 (24 Hrs). This closure is to accommodate the placement of roughly 640 cubic yards of concrete. It is presumed that the concrete will be pumped from the land wall to the cell and there will be a lot of activities taking place at this time. The contractor will most likely be working around the clock in order to get everything done during this 24 hr closure. I think we would want to give the contractor full access to the upstream area during this closure.

Closure 4 (12 Hrs). This closure is to accommodate the placement of the last lift of concrete. This was originally shown as a 24 hr closure to be conservative in the schedule. The specs show this as a 12 hr closure. Again, the concrete will be pumped from the land wall to the cell which may restrict traffic during this time.