Posting Bridges for Specialized Single-Unit Trucks Specialized Hauling Vehicles are closely spaced multi axle single unit trucks introduced in the last decade. Examples include dump trucks, construction vehicles, solid waste trucks, and other hauling trucks. They are considered legal in all states, if state laws do not explicitly exclude such vehicles. Bert Hartman May 2016

FHWA Memo on SHV Ratings November 2013 Category 1 Bridges Rating factors less than 1.3 for any of the 3 standard legal vehicles Must be complete by December 2017 Category 2 Bridges All remaining load ratings need to be updated for the SHV’s Must be complete by December 2022 3710 Bridges Total, 2800 Local Agency

Map of bridges to be evaluated by December 2017 is available https://gis.odot.state.or.us/transgis/

Weight Limit Reduced for Legal Loads

Weight Limit Reduced for Single Unit Vehicles Only

Coordination with FHWA on 29 Posted Bridges – 15 Tons or Less

Bridge With 15 Foot Spans

Concrete Bridges With No Plans (246) Load capacity cannot be calculated Judgement is used Bridges in service more than 20 years with no distress have adequate load capacity for legal loads up to the SU4 Concrete bridges without plans that are in fair or better condition will be posted for the SU5, SU6, and SU7

Concrete Bridges With No Plans Reduced capacity based on condition

728 Category 1 Bridges To Rate 259 Reinforced Concrete Girder 213 Timber 178 Steel I Girder 43 Steel Truss 15 Arch Bridges 12 Complex Bridges 4 Culverts 2 Post Tensioned Girder 2 Steel Box Girder

186 Category 1 Bridges Rated 59 Reinforced Concrete Girder 20 Rating Factors Above 1.0 39 Under Review 126 Steel I Girder 15 Rating Factors Above 1.0 111 Under Review (Bracing Issues) 1 Post Tensioned Girder 1 Rating Factor above 1.0

Category 1 Load Rating Status Arch Bridges Procedures under development 2 bridges to be rated 13 remaining arch bridges Timber 4 bridges to be rated 194 remaining timber bridges

Load Restriction Letters There are currently 40 bridges that are in progress for writing load restriction letters on.

Steel I-Girder Bridge Under Review Douglas County Bridge 19C209

Steel I-Girder Bridge Under Review

Retrofit of ODOT Bridge

Retrofit of ODOT Bridge 96 holes drilled in the deck of a 22 foot by 26 foot bridge Cost $32,000

Steel I-Girder Bridge, Steel Deck

Lake Slough – 99W Built in 1919

Poor Reinforcement Details A load restriction letter was sent to post this bridge at 12/20/24 for the three classic legal trucks.

Load Testing

Lake Slough Advanced Analysis to avoid load Posting Monthly monitoring until replaced Replacement to be bid in Sept 2016 Project Estimate- $2.9M

Ochoco Creek Widened Both Sides – 1954

No Plans for the original Bridge Freeze/Thaw Damage Shear and Flexure Cracks Recommended Posting at 13/20/20 based on criteria for bridges with no plans. Letter sent in April. Bridge Designer and Materials Engineer investigated original structure to find additional rows of rebar using a rebar locator. Concrete was chipped away to identify reinforcement. The resulting load rating was less than the original analysis that was for without plans. Based on history of service carrying unrestricted loads, redundant load paths by having seven girders. Recommended Posting at 13 Tons in May. District wanted to use barriers and put traffic on widened structure, but widening was too narrow for that. Proof Load Test in early May. Discussion of using a temporary Acrow Bridge Letter to the OTC in May to add the bridge to the STIP for replacement

Temporary Repair

Repair Cost - $55K Replacement Cost -$2.9M

Fixing America’s Surface Transportation Act (FAST Act)

Fixing America’s Surface Transportation Act (FAST Act) Interstate and within reasonable access to the Interstate. Emergency Vehicle Limits 86,000 Lbs. GVW 24,000 Lbs. Single Steer Axle 62,000 Lbs. Tandem Axle

FHWA Memo on FAST Act States Must Consider These Vehicle Weight Limits When Load Rating And Posting Highway Bridges To Maintain Compliance

Emergency Vehicle Tire Width OAR 734-082-0009 (6/18/2015) 635 Pounds/Inch of Tire Width 1950’s and 1960’s bridges with “thin decks” Pavement fatigue damage increases to the fourth power

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