2. 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 CCHamby 97

3. Location Map 2 Columbia L&D Thatcher L&D Felsenthal L&D Jonesville L&D

4. Columbia L & D Descript 84’ x 600’ Lock 4@50’ Wide Tainter Gates 200’ Wide Navigation Pass Guide Wall Flow West Abutment Miter Gate

5. The Accident

6. Columbia Lock and Dam 8 March 97 9pm

7. Columbia Lock and Dam

10. 10pm

11. 1am 9 March 97

12. Columbia Lock and Dam

13. 2:45am

14. 6am

15. Photo Barge in Gate 1 photo 10 Mar 97

16. Photo Barge in Gate 1 10 Mar 97

17. Photo Barge in Gate 1

18. Gate 1 Damage

19. Barge Removed from Gate 1 photo 11 Mar 97

20. Barge Removed

21. 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

22. Lock Underwater ___ photo fig II-1 (where is the lock?)

23. Lock Underwater ___ photo fig II-2 Highway Barriers Lock Chamber Miter Gate

24. Highway Barriers Borrow from LADOTD

25. Highway Barriers ___ photo fig II-3

26. Highway Barriers ___ photo fig II-4

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

28. Miter Gate Extension Fig II-6 9 Apr Timber over miter gate and barriers along the wall

29. Operating the Lock __photo fig II-7 opening the gate valves

30. Passing the Salvage Derrick Barge __photo fig II-8 derrick barge goes through the lock

31. Salvage Ops Orientation of barges fig IV-2

32. Salvage Ops ___ fig IV-1

33. Salvage Ops – Ent Pipe Sktch Sketch diver going through the pipe to cut holes

34. Salvage Ops – Ent Pipe Phot0 ___ figs IV-3 pipe in water

35. Salvage Ops - Diver Photo diver going through the pipe to cut holesPhoto diver going through the pipe to cut holes

36. Salvage Ops - Tender Photo diver going through the pipe to cut holesPhoto diver going through the pipe to cut holes

37. Salvage Ops - Spectators TV Media Spectators photo

38. Salvage Ops – Barge Exposed ___ figs IV-4

39. Salvage Ops – Barge Rising ___ figs IV-4

40. Salvage Ops – Barge Raised ___ figs IV-4

41. Salvage Ops- Chain Connection ___ figs IV-x

42. Stone Repairs Sketch 1 Show plan view sketch of all holes

43. Stone Repairs Sketch guideWx

44. Stone Repairs Sketch tainterx

45. Stone Repair Photo new stone

46. Stone Repair Photo drop stone

47. Stone Repairs Sketch US fix x

48. Stone Repairs Sketch nav x

49. Navigation Pass Flow __photo fig II-10 water thru nav pass 9Apr add sound from VHF tape

50. 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

51. Stone Repairs Sketch nav orig

52. Stone Repairs Sketch nav hole

53. Navigation Pass Repair Photo __photo 30 May

54. Bent strut frame

55. Bent strut frame measurements

56. Gate Damage Trunion bolts Center hole jack

57. Installed Stop logs Fig IV-14 ___

58. WorkBarge Bullet ___

59. Second Barge Flips on to it’s Side 8 June 97

60. Secure the Trunion Bullet ___

61. Marking the VEE

62. Restraints Restraint Applied

63. Gentle Force Tightening Up the Restraint

64. Heat the VEE’s photo

65. Shrinking the Vee’s Shrinking the Vee’s – Cooled by Pressurized H 2 O

66. Job Done photo

67. Gate 1 Before Before

68. after Gate 1 After Brace Cover Plate After

69. Summing it up $1.25m Overall Repair Expense