23 CFR § 490.405 - Definitions.

---
identifier: "/us/cfr/t23/s490.405"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "23 CFR § 490.405 - Definitions."
title_number: 23
title_name: "Highways"
section_number: "490.405"
section_name: "Definitions."
chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "E"
subchapter_name: "PLANNING AND RESEARCH"
part_number: "490"
part_name: "NATIONAL PERFORMANCE MANAGEMENT MEASURES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "23 U.S.C. 134, 135, 148(i) and 150; 49 CFR 1.85."
regulatory_source: "81 FR 13913, Mar. 15, 2016, unless otherwise noted."
cfr_part: "490"
---


# 490.405 Definitions.

The following definitions are only applicable to this subpart, unless otherwise provided:

*Structurally deficient* as used in §§ 490.411 and 490.413 is a classification given to a bridge which has any component in Poor or worse condition or the adequacy of the waterway opening provided by the bridge is determined to be insufficient to the point of causing overtopping with intolerable traffic interruptions. Beginning with calendar year 2018 and thereafter, *structurally deficient* as used in §§ 490.411 and 490.413 is a classification given to a bridge which has any component in Poor or worse condition.