Dam Safety Case History

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					      Dam Safety Case History

Columbia Lock and Dam
March 8, 1997


   “A number of courageous people worked in sometimes
   dangerous circumstance to perform their missions. We
   are grateful that throughout all of this no one was
   injured and we were all successful in our efforts.”
                                              CCHamby 97
Location Map
                   •       Felsenthal L&D
      2            •       Thatcher L&D


       •
                       • Columbia L&D
           •
                           •    Jonesville L&D
               •       •

                            •
             Columbia L & D Descript


             84’ x 600’ Lock

                                200’ Wide Navigation
                Miter Gate
                                Pass




                4@50’ Wide
                Tainter Gates         West Abutment

Guide Wall
The Accident
8 March 97
             Columbia Lock and Dam




   9pm
Columbia Lock and Dam
Columbia Lock and Dam
Columbia Lock and Dam
       Columbia Lock and Dam




10pm
9 March 97     Columbia Lock and Dam




             1am
Columbia Lock and Dam
Columbia Lock and Dam




 2:45am
Columbia Lock and Dam




         6am
10 Mar 97

               Photo Barge in Gate 1


            • photo
10 Mar 97

            Photo Barge in Gate 1
Photo Barge in Gate 1
Gate 1 Damage
11 Mar 97


            Barge Removed from Gate 1


            • photo
Barge Removed
          Identifying the Problems

•   Remove Two Sunken Barges
•   Damaged & Inoperable Tainter Gate
•   Too Much Flow thru the Nav Pass
•   The River Forecast is Bad News
•   There is no heavy equipment upstream
            Lock Underwater

• ___ photo fig II-1 (where is the lock?)
                                   Highway
                                   Barriers

            Lock Underwater

• ___ photo fig II-2
                              Lock Chamber




                Miter
                Gate
         Highway Barriers

• Borrow from LADOTD
            Highway Barriers

• ___ photo fig II-3
            Highway Barriers

• ___ photo fig II-4
         Miter Gate Extension

• Designed and Built Wooden Extension
• __photo fig II-5
         Miter Gate Extension

Fig II-6 9 Apr
Timber over miter gate and barriers along
  the wall
          Operating the Lock

• __photo fig II-7 opening the gate valves
  Passing the
 Salvage Derrick
      Barge

• __photo fig II-8
  derrick barge goes
  through the lock
              Salvage Ops

• Orientation of barges fig IV-2
                 Salvage Ops

• ___ fig IV-1
   Salvage Ops – Ent Pipe Sktch
• Sketch diver going through the
  pipe to cut holes
   Salvage Ops – Ent Pipe Phot0

• ___ figs IV-3 pipe in water
        Salvage Ops - Diver

• Photo diver going through the pipe to cut
  holes
       Salvage Ops - Tender

• Photo diver going through the pipe to cut
  holes
    Salvage Ops - Spectators

• TV Media
• Spectators photo
   Salvage Ops – Barge Exposed
• ___ figs IV-4
    Salvage Ops – Barge Rising
• ___ figs IV-4
    Salvage Ops – Barge Raised
• ___ figs IV-4
  Salvage Ops- Chain Connection

• ___ figs IV-x
       Stone Repairs Sketch 1

• Show plan view sketch of all holes
Stone Repairs Sketch guideWx
Stone Repairs Sketch tainterx
Stone Repair Photo new stone
Stone Repair Photo drop stone
Stone Repairs Sketch US fix x
Stone Repairs Sketch nav x
        Navigation Pass Flow

• __photo fig II-10 water thru nav pass 9Apr
•   add sound from VHF tape
        Navigation Pass Damage

• __photo fig II-10 9 Apr
• Additional Surveys made after river slowed down
• Slab fell into the hole (show 3D survey or fig III-
  10)
• Show cross section with hole and stability prob
Stone Repairs Sketch nav orig
Stone Repairs Sketch nav hole
   Navigation Pass Repair Photo

• __photo 30 May
Bent strut frame
Bent strut frame
 measurements
Gate Damage
        • Trunion bolts
        • Center hole jack
        Installed Stop logs

• Fig IV-14
• ___
           WorkBarge

• Bullet
• ___
  Second
Barge Flips
 on to it’s
   Side

8 June 97
           Secure the Trunion

• Bullet
• ___
Marking the
   VEE
             Restraint Applied
Restraints
Tightening Up the Restraint
 Gentle Force
Heat the VEE’s


• photo
               Shrinking the Vee’s –
Shrinking   the Vee’s by Pressurized
                 Cooled
                 H2O
      Job Done


• photo
Gate 1 Before
        Before
• after
                  Gate 1 After After



          Brace
Summing it up
Overall Repair
  Expense
   $1.25m