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  • Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on
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1 Surveying the I-35W Bridge Collapse Minnesota Society of Professional Surveyors 57 th Annual Meeting January 28 - 30, 2009 St. Cloud Civic Center St. Cloud, Minnesota Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4 th table down on the left side in Famous Dave’s restaurant in Woodbury, MN and had just gotten our meals served. – My cell phone rang, it was my son. – The 35W bridge had collapsed!

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Page 1: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Surveying theI-35W Bridge Collapse

Minnesota Society of Professional Surveyors57th Annual MeetingJanuary 28 - 30, 2009St. Cloud Civic CenterSt. Cloud, Minnesota

Where were you?

• Do you remember where you were onAugust 1, 2007 at 6:05 PM?

• I remember precisely!– My wife and I were seated at the 4th table

down on the left side in Famous Dave’srestaurant in Woodbury, MN and had justgotten our meals served.

– My cell phone rang, it was my son.

– The 35W bridge had collapsed!

Page 2: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Page 3: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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The CollapseOccurred at 6:05 p.m.

Wednesday, August 1, 2007

Over 100 vehicles on the bridgeat the time of the collapse.

13 fatalities105 injuries

I-35W BridgeI-35W Bridge

UniversityUniversityofof

MinnesotaMinnesota

DowntownDowntownMinneapolisMinneapolis

http://maps.google.com/

My daughter’sapartment

Page 4: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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U of M building

Army Corp of EngineersLock and dam

Railroad 10th Ave bridge

West River Rd

I-35W Bridge Construction - Looking North

July, 1965

Page 5: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Concrete Slab

Floor Truss

Concrete Pier

Main Truss

Photos about 1 mo. before collapse

Looking South

Looking North

Page 6: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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An Unprecedented Event

I-35W Collapse Area

Page 7: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Field offices

Safety gridmap

Page 8: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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SecurityBadges 1

2

3

4

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The President comes to town

Page 9: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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President of the United States of AmericaGeorge Bush, Governor Tim Pawlenty, &

Mayor R. T. Rybak

Aerial photos and LiDAR mappingMetro Surveys set ground control targets

Oblique photos Vertical photos & LiDAR

Page 10: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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FBI doing survey work

“Crazy” FBI surveyors!!

Page 11: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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FBI Laser Scanning

Cops everywhere and lots of themFBI surveying in background

Metro Surveys Static GPS in foreground

Page 12: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Monitoring for possible bridge movement

Total station doing monitoring work

Page 13: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Monitoringlocations

Monitoring continued in all weatherconditions

Page 14: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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This was why we were monitoring

Navy divers

Page 15: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Morning coordination of day’s activities

Pre-CollapseHorizontal andVertical Control

Points

Page 16: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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FBI & StatePatrol Control

Points

They started onassumed datums

Establishing control with static GPS

Page 17: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Section corner GPS work for R/W needs

Metro Surveys &FBI & State

Patrol ControlPoints

We felt all survey workshould be on samedatums. We GPS’d allFBI & State Patrolpoints and gave themXYZ values

Page 18: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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VRS stations usedfor establishingcontrol for the

bridge collapse site

HDS Laser Scanning

• “Scan the Bridge!”– First thought after the initial shock was the

need for Surveys to scan the wreckage

• New to MN/DOT– Delivered at end of January, 2007

– Used on various projects

– “Marketing” demos to MN/DOT personnel

Page 19: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Scanning on south side of river

Scanning bysouth piers

Page 20: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Working conditions

FBI

MN/DOT

Scanning by River Road

Page 21: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Scanning from 10th Ave. bridge

Scanning from lock wall area

Page 22: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Scanner on lock wall

Scanner at work on north side

Page 23: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Two scanners on deck ofun-collapsed section

Both scanners in action

Page 24: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Explaining the scanner to the Incident Commander

Total scanned area

Page 25: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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South side of river by locks

North side of river

Page 26: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Wreckage with vehicles

Car perched on bent deck

Page 27: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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School bus

Section north of river

Page 28: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Rail cars under bridge deck

Crushed rail cars

Page 29: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Detail of scan – end of beam

Steel beams of bridge deckin river

Page 30: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Steel over north piers

LASER SCAN OF COLLAPSED BRIDGE

Page 31: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Bohemian Flats areaStaked location of trusses for forensic review

Traffic Restorationprojects

• Projectsconsidered forconstructionto re-routetraffic awayfrom 35Wbridge site

Page 32: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Traffic Restoration projects

• Metro Surveysdid designsurveying and/orconstructionsurveying on 11different projects

Work on Traffic Restoration project

Page 33: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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2007 ConstructionProjects

• Normal constructionkept going

• Covered all jobswithout delays

• D3 crew assisted onUnWeave project

GPS’ing Minneapolis control monumentby Geodetics

Page 34: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Metro Surveys& Geodetics

control points

Geodeticcontrol points

for building thenew bridge

Page 35: Where were you?...Where were you? • Do you remember where you were on August 1, 2007 at 6:05 PM? • I remember precisely! – My wife and I were seated at the 4th table down on

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Thanks to Private Survey firms

• Haackanson/Anderson

• Sunde Land Surveying

• Comstock & Davis

Questions?

The Minnesota Department of Transportation’s authorization to present this power point

is in accordance with permission from the National Transportation Safety Board,

pursuant to 49 C.F.R. § 831.13.


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