23 CFR § 661.17 - What are the criteria for bridge eligibility?

---
identifier: "/us/cfr/t23/s661.17"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "23 CFR § 661.17 - What are the criteria for bridge eligibility?"
title_number: 23
title_name: "Highways"
section_number: "661.17"
section_name: "What are the criteria for bridge eligibility?"
chapter_name: "FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "G"
subchapter_name: "ENGINEERING AND TRAFFIC OPERATIONS"
part_number: "661"
part_name: "TRIBAL TRANSPORTATION FACILITY BRIDGE PROGRAM (TTFBP)"
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. 120(j) and (k), 202, and 315; 49 CFR 1.81, 1.84, 1.85; 23 CFR part 490, subpart D."
regulatory_source: "89 FR 57082, July 12, 2024, unless otherwise noted."
cfr_part: "661"
---


# 661.17 What are the criteria for bridge eligibility?

(a) For bridge replacement or rehabilitation, TTF bridges are required to meet the following:

(1) Must meet the definition of a TTF bridge;

(2) Be classified as a Tribal transportation facility;

(3) Be classified as in poor condition, have low load capacity, or need highway geometric improvements;

(4) Be recorded in the NBI maintained by FHWA;

(b) For new bridge construction, TTF bridges are required to meet the following:

(1) Be classified as a Tribal transportation facility;

(2) Be a public bridge that meets the definition of a TTF bridge and recorded in the NBI after project completion.