Status of North Carolina Bridges Report to the 21st Century Transportation Committee February, 2008 Lacy D. Love, PE Director of Asset Management NCDOT
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
Bridges vs vs. Structures . Structures Bridges Floating barge w/Bridge Bridges Culverts Pipes
Structurally Deficient Bridge Structurally Deficient Bridge Haywood County #79 built in 1891 Haywood County #79 built in 1891 Structurally Deficient ~ 2200 Structurally Deficient ~ 2200
Functionally Obsolete Bridge Functionally Obsolete Bridge Functionally Obsolete due to roadway clearance Functionally Obsolete ~ 3000
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%)
Inspection Program Inspection Program • 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
Bridge Analysis Bridge Analysis
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’ ’ or more; state or more; state- -owned and owned and span length of 20 maintained. maintained. ~ 12,600 state ~ 12,600 state- -owned and maintained Bridges owned 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
Percent of Deficient NC Bridge Percent of Deficient NC Bridge (includes culverts and all bridge owners) (includes culverts and all bridge owners) 38 36 34 32 Percent 30 28 26 24 22 20 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Year NC Bridges National Bridges
NCDOT vs vs. Southeast States . Southeast States NCDOT (state DOTs DOTs’ ’ including culverts) including culverts) (state 30 25 Percent Deficient 20 15 10 5 0 AL FL GA KY LA MS NC SC TN TX VA
Age of NCDOT Bridges Age of NCDOT Bridges (not including culverts) (not including culverts) 3500 3000 2500 2000 1500 1000 500 0 <1930 1930 1940 1950 1960 1970 1980 1990 2000 # Bridges # Deficient Bridges
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.
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 %
Major Bridge Components Major Bridge Components
Condition Rating Distribution Condition Rating Distribution 4500 Goal: 4000 3500 6 CR CR 3000 # Bridges 2500 2000 1500 1000 500 0 9 8 7 6 5 4 3 2 1 Deck Superstructure Substructure
Performance Standards - - Example Example Performance Standards Functional Work Group Worksheet 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 LOS Category LOS Description A 15% or less of condition ratings below 6. B Between 15.1% and 20% of condition ratings below 6. C Between 20.1% and 25% of condition ratings below 6. D Between 25.1% and 30% of condition ratings below 6. F 30% or more of condition ratings below 6. Statewide Regional Subregional Division County Performance Target B B C NA NA Assessment Method BIR BIR BIR BIR BIR
Performance Standards Performance Standards SF DECK STATEWIDE TIER < 6 LOS FOR DECKS SF DECK REGIONAL TIER <6 SF DECK SUBREGIONAL TIER <6 60.00% 50.00% 40.00% LOS F % SF < 6 30.00% LOS D LOS C 20.00% LOS B 10.00% LOS A 0.00% 01 02 03 04 05 06 07 08 09 10 11 12 13 14 DIVISIONS
Asset Management Approach Asset Management Approach Policy Driven Policy Driven - - Decisions based Decisions based on well defined policy on 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 Decisions based on Quality Information Decisions based on Quality Information - - Investment decision based Investment decision based on accurate and timely data on 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 Allows better communication with stakeholders, legislature and public ublic Allows better communication with stakeholders, legislature and p Better able to allocate resources to most needed work Better able to allocate resources to most needed work
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
Mix of Fixes Mix of Fixes
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
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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