Conditions and Performance Chapter Listing

Conditions and Performance Home Page

Introduction

Background

Current Conditions and Performance

Projected Conditions and Performance in 2007

Resources Needed to Maintain and Improve the Interstate System

Addressing Interstate System Needs

Bridge Conditions

Chapter 3 also discusses the bridge deficiencies for all functional systems, including Interstate high-ways. Exhibit 3-29 show trends for rural Interstates and urban Interstates from 1993 to 1997. The 1997 data are highlighted in Exhibit A-4.

Exhibit A-4. Interstate Bridge Condition, 1998

In 1998 there were 55,010 bridges on the Interstate Highway System. The number of rural and urban Interstate bridges is virtually equal, as approximately 50.0 percent of the total are in rural areas. Of the total number of rural Interstate bridges, 16.4 percent were classified as deficient, including 4.1 percent that were structurally deficient, and 12.2 percent that were functionally obsolete. In urban areas, 26.8 percent of Interstate bridges were deficient in 1998, including 6.7 percent classified as structurally deficient and 20.1 percent classified as functionally obsolete.

The percentage of deficient Interstate bridges has declined in recent years in both rural and urban areas, and for both structural and functional deficiencies. Since 1992, the number of deficient Interstate bridges has fallen from 13,725 to 11,880.