Historic & Environmental


The Ohio River Bridges Project is governed by a detailed list of environmental and historic mitigation obligations that have been carefully researched and are being addressed at each stage of the project. The sum total of these efforts results in the design and construction of each of the six sections of the Ohio River Bridges Project, including measures to protect and preserve historic, cultural and environmental resources.

The specific measures the Project addresses were identified in the Environmental Impact Statement phase of the project and recorded in three project documents – the Final Environmental Impact Statement (FEIS), the Section 106 Memorandum of Agreement (MOA) and its parent document, the Record of Decision (ROD).

The Memorandum of Agreement

The Section 106 Memorandum of Agreement (MOA) governs the manner in which the Bridges Project interacts with historic, environmental, social and cultural features of the project area. More >>

Historic Preservation Advisory Teams

Historic Preservation Advisory Teams (HPATs) ensure the Project’s designs respect the historic and environmental resources of the project area. More »

Bi-State Historic Consultation Team

The Bi-State Historic Consultation Team (BSHCT) advises Project officials on design and construction issues having to do with historic preservation commitments outlined in the MOA. More »

Social/Natural Mitigation

The Project’s environmental mitigation measures focus on avoiding impacts to endangered species and preserving valuable environmental resources within its footprint. More »

PM 2.5 Hotspot Analysis:

The Louisville-Southern Indiana Ohio River Bridges (LSIORB) Project is located within the U.S. Environmental Protection Agency’s designated Louisville, KY-IN region PM2.5 non-attainment area. As such, the project is required to meet Transportation Conformity Rule requirements found in 40 CFR Part 93. The Transportation Conformity Rule requires a hotspot analysis as part of the project-level conformity in PM2.5 non-attainment areas for certain projects. The January 8, 2007 document titled “Final PM2.5 Project-Level Conformity Analysis for the Ohio River Bridges Project in Louisville, Kentucky” addresses the new project-level transportation conformity requirements for the LSIORB project. This report was made available to the public for review and comment for a period of 15 days, between November 21, 2006 and December 6, 2006. On January 4, 2007, the Federal Highway Administration made an air quality particulate matter (PM2.5) conformity determination that the LSIORB project met the requirements of 40 CFR 93.
The PM2.5 project-level analysis conducted for the LSIORB project found that by meeting the requirements of 40 CFR Part 93, that the project will not:

  • cause or contribute to any new violation of the PM2.5 standard
  • increase the frequency or severity of any existing violation of the PM2.5 standard
  • delay timely attainment of the PM2.5 standard

Read the PM 2.5 Hotspot Analysis

More information about air quality particulate matter can be found at the following Federal Highway Administration and U.S. EPA websites:

Historic and Environmental Preservation activities are overseen by the following CTS Staff Members:



Back to the Project Library