[PPT] - Status of North Carolina Bridges Report to the 21st Century PowerPoint Presentation

SLIDE 1

Status of North Carolina Bridges Report to the 21st Century Transportation Committee February, 2008

Lacy D. Love, PE Director of Asset Management NCDOT

SLIDE 2

Status of NC Bridges Status of NC Bridges

Introduction Introduction

  Definitions

Definitions

  Bridges

Bridges vs

vs. Structures

. Structures

  Inspection Program Overview

Inspection Program Overview

  Bridge Condition

Bridge Condition

  Performance Goals

Performance Goals

  Management Approach

Management Approach

  Challenges

Challenges

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Bridges Bridges vs

vs. Structures

. Structures

Bridges Pipes Culverts Floating barge w/Bridge

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Structurally Deficient Bridge Structurally Deficient Bridge

Haywood County #79 built in 1891 Haywood County #79 built in 1891

Structurally Deficient ~ 2200 Structurally Deficient ~ 2200

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Functionally Obsolete Bridge Functionally Obsolete Bridge

Functionally Obsolete ~ 3000 Functionally Obsolete due to roadway clearance

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Sufficiency Rating Sufficiency Rating

  Established by FHWA

Established by FHWA

  Compares existing bridge to a new bridge designed to current

Compares existing bridge to a new bridge designed to current engineering standards engineering standards

  Measure of Bridge

Measure of Bridge’ ’s overall condition (scale 0 to 100) s overall condition (scale 0 to 100)

  Used to determine eligibility for Federal Aid Bridge funds

Used to determine eligibility for Federal Aid Bridge funds

  Must be < 50 for Replacement

Must be < 50 for Replacement

  Must be < 80 for Rehabilitation

Must be < 80 for Rehabilitation

  Does not imply the bridge is unsafe

Does not imply the bridge is unsafe

  Formula based on

Formula based on

  Structural Condition of Bridge (55%)

Structural Condition of Bridge (55%)

  Serviceability and Obsolescence (30%)

Serviceability and Obsolescence (30%)

  Essentiality to public use (15%)

Essentiality to public use (15%)

SLIDE 7

Every Bridge inspected every 2 years
Detail inspection by Inspection teams
Above water teams - 18
Underwater teams - 4
Special evaluation teams - 4
Supplemented by private inspectors
Each element rated based on condition (1 to 9)
Teams document maintenance needs for each element for

each bridge

Maintenance needs entered into Bridge Management

System

Inspection Program Inspection Program

SLIDE 8

Bridge Analysis Bridge Analysis

SLIDE 9

Status of NCDOT Bridges Status of NCDOT Bridges

  17,300 Total Structures including concrete

17,300 Total Structures including concrete culverts and metal structures (pipes) that have a culverts and metal structures (pipes) that have a span length of 20 span length of 20’ ’ or more; state

r more; state-
owned and
wned and

maintained. maintained.

  ~ 12,600 state

~ 12,600 state-

owned and maintained Bridges
wned and maintained Bridges

  ~ 2,000 bridges with SR < 50

~ 2,000 bridges with SR < 50

  ~ 700 bridges are programmed in TIP

~ 700 bridges are programmed in TIP

  ~ 4,000 with timber components

~ 4,000 with timber components

  ~ 35% increase in deck area in the last 20 years

~ 35% increase in deck area in the last 20 years

SLIDE 10

Percent of Deficient NC Bridge Percent of Deficient NC Bridge

(includes culverts and all bridge owners) (includes culverts and all bridge owners)

20 22 24 26 28 30 32 34 36 38 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Year Percent NC Bridges National Bridges

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NCDOT NCDOT vs

vs. Southeast States

. Southeast States

(state (state DOTs DOTs’ ’ including culverts) including culverts)

5 10 15 20 25 30 Percent Deficient AL FL GA KY LA MS NC SC TN TX VA

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500 1000 1500 2000 2500 3000 3500 <1930 1930 1940 1950 1960 1970 1980 1990 2000

# Bridges # Deficient Bridges

Age of NCDOT Bridges Age of NCDOT Bridges

(not including culverts) (not including culverts)

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Performance & Accountability Performance & Accountability

  DOT is currently implementing a new

DOT is currently implementing a new performance measures program which has as a performance measures program which has as a goal to achieve a targeted level of service . goal to achieve a targeted level of service .

  A Bridge Technical Team has been established to

A Bridge Technical Team has been established to draft the performance goals which will be draft the performance goals which will be implemented in the new program. implemented in the new program.

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Performance Measure Performance Measure % Structurally Deficient % Structurally Deficient

SYSTEM TARGET CURRENT GAP SW TIER 1 % 9.9 % 8.9 %

REG. TIER

5 % 15.6 % 10.6 %

SUB. TIER

15 % 20 % 5 % ALL TIERS 10 % 17.4 % 7.4 %

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Major Bridge Components Major Bridge Components

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Condition Rating Distribution Condition Rating Distribution

500 1000 1500 2000 2500 3000 3500 4000 4500 # Bridges 9 8 7 6 5 4 3 2 1 Deck Superstructure Substructure

Goal:  6 CR CR

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Performance Standards Performance Standards -

Example

Example

Element: Bridge Maintenance and Preservation Asset: Deck Activities: Deck Maintenance Condition Indicator: Condition Rating of less than or equal to 6. Performance Measure: Condition Rating by Square Feet of Deck Statewide Regional Subregional Division County Performance Target B B C NA NA Assessment Method BIR BIR BIR BIR BIR LOS Description A B

Functional Work Group Worksheet

LOS Category F 15% or less of condition ratings below 6. Between 15.1% and 20% of condition ratings below 6. Between 20.1% and 25% of condition ratings below 6. Between 25.1% and 30% of condition ratings below 6. 30% or more of condition ratings below 6. C D

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Performance Standards Performance Standards

LOS FOR DECKS

0.00% 10.00% 20.00% 30.00% 40.00% 50.00% 60.00% 01 02 03 04 05 06 07 08 09 10 11 12 13 14

DIVISIONS % SF < 6

SF DECK STATEWIDE TIER < 6 SF DECK REGIONAL TIER <6 SF DECK SUBREGIONAL TIER <6

LOS F LOS D LOS C LOS B LOS A

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Asset Management Approach Asset Management Approach

  Policy Driven

Policy Driven -

Decisions based

Decisions based

n well defined policy
n well defined policy

  Performance Based

Performance Based -

Policy

Policy decisions drive the outcomes decisions drive the outcomes

  Analytical Analysis

Analytical Analysis -

Resource

Resource allocation based on modern allocation based on modern investment analysis and best value investment analysis and best value concepts concepts Allows better communication with stakeholders, legislature and p Allows better communication with stakeholders, legislature and public ublic Better able to allocate resources to most needed work Better able to allocate resources to most needed work

  Decisions based on Quality Information

Decisions based on Quality Information -

Investment decision based

Investment decision based

n accurate and timely data
n accurate and timely data

  Monitoring for Accountability

Monitoring for Accountability -

Performance results are monitored for

Performance results are monitored for accountability and efficiency improvement accountability and efficiency improvement

SLIDE 20

Mix of Fixes Mix of Fixes

  Mix of Fixes

Mix of Fixes -

Keep good bridges good

Keep good bridges good

  Maintenance

Maintenance

  Routine & Corrective

Routine & Corrective

  Preservation

Preservation

  Extend Service Life

Extend Service Life

  Rehabilitation

Rehabilitation

  Restore to new like condition

Restore to new like condition

  Replacement

Replacement

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Mix of Fixes Mix of Fixes

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Current Funding of NC Bridges Current Funding of NC Bridges

  Statewide bridge maintenance budget for FY 07

Statewide bridge maintenance budget for FY 07-

08

08 is $65 M is $65 M

  Beginning Preservation Program ( $15M)

Beginning Preservation Program ( $15M)

  Federal Funds

Federal Funds

  System Preservation Maintenance Funds

System Preservation Maintenance Funds

  Overweight truck fees

Overweight truck fees

  NCDOT replaces ~ 120 bridges per year at an

NCDOT replaces ~ 120 bridges per year at an average expenditure of $200 M/yr. average expenditure of $200 M/yr.

  Current maintenance needs as documented by the

Current maintenance needs as documented by the inspectors are ~ $350 M inspectors are ~ $350 M

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Challenges Challenges

  Aging Bridges

Aging Bridges

  Predictive modeling tool estimates # Deficient

Predictive modeling tool estimates # Deficient bridges to grow to ~ 7,000 by 2020 bridges to grow to ~ 7,000 by 2020

  Balance between bridge replacement projects and

Balance between bridge replacement projects and environmental stewardship environmental stewardship

  Limited Replacement Funds

Limited Replacement Funds

  Competition for Maintenance Dollars with other

Competition for Maintenance Dollars with other Infrastructure Needs Infrastructure Needs

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