Overview of Bridge Inspections in Missouri David Koenig Bridge Management Engineer Missouri Department of Transportation Missouri Bridge Conference April 9, 2015 Columbia, MO

Missouri Structure Totals 2014 National Bridge Inventory NBI Length Bridges (i.e. >20’ Length) MoDOT—10,371 Local—13,977 Total—24,348

Map—MoDOT Structures

Structure Lengths Longest Local5,731’ (McKinley-St. Louis) MoDOT7,845’ (Double Decker-St. Louis) Distribution >5000’—11>4000’—24 >3000’—43>2000’—86 >1000’—224<300’—22,759 AverageLocal—69’ MoDOT—196’ Statewide—123’

Posted Structures MoDOT—1,367 Local—3,495 Total— 4,862

Deficient Structures Structural 1,058—MoDOT 2,200—Local 3,258—Total Functional 908—MoDOT 1,666—Local 2,574—Total Total Deficient 1,966—MoDOT 3,866—Local 5,832—Total

Inspections Why do we do it? Federal Law NBIS Regulations Public Safety

Inspections Failures—65% from Scour/Hydraulic issues Others from a wide variety of causes

Inspections Types/Frequency (Defined by Federal Law) General/Routine (24 months) Special (Varies, 60 months max) Fracture Critical (24 months) Underwater (60 months) In Depth (Per State Policy) Qualifications (Federal Law) Team Leader qualified person required on site during all inspections Divers required to meet specific inspection training requirements

Inspections General/Routine Majority of State/Local done by District Offices State ones that require special access equipment are done by Bridge Division out of Jefferson City Four local agencies do their own inspections with oversight by MoDOT Statewide around 70 people full/part time people are involved at a cost of $3 million per year Most done September thru March, but there are some going on year round

Inspections Fracture Critical (950 Total) MoDOT (235)—Bridge Division UBI Crews Local (715)—Districts/Consultants Perform

Inspections Underwater Dives—163 (NBI) Deep Wades—about 200 Bridge Division/Consultants Districts may Assist

Inspections In Depth Total—694 Common Examples Major Lake Major River Others are for things hard to see from the ground, known problematic areas, and things that just need an occasional closer look Example—Non FC Cantilever area with crack. Repaired.

Inspections Specials Around 300 statewide Typically done by UBI Crews Occasionally Districts/Consultants Example— visual inspection found suspected crack. Dye penetrant was used to to define extent. Pin may have had ultrasound done as well. Bridge was closed and later replaced.

Inspections Element Level Inspections New MAP21 Requirement NHS Structures Only Started October 1, ,729 total NHS structures Have 800+ currently completed Minimum set of elements required to be collected and reported to FHWA MoDOT has chosen to only do the minimum that is required by MAP21

Inspections Required Elements National Bridge Elements Deck/Slab, Railings, Superstructure, Substructure, Culverts, Bearings, Railings Bridge Management Elements Joints, Wearing Surface, Steel Protective Coating, Concrete Protective Coating Report Total Quantity for each Element Report Quantities for one of four Condition States CS1 (best), CS2, CS3, and CS4 (worst) Quantities—Square Feet, Linear Feet, Each