OTHR EIS
US Air Force logo

Homeland Defense Over-the-Horizon Radar
at Northwest Region United States
Environmental Impact Statement

A diagram depicting transmission of radio signals for radar from a transmitter. They go up to the ionosphere, back down to the earth's surface, and, if it hits an object, it bounces back to the ionosphere and then to the receiver.

Welcome to the project website for the Environmental Impact Statement

Welcome to the project website for the Environmental Impact Statement (EIS) for the Department of the Air Force (DAF) proposal to acquire land, construct, and operate two Homeland Defense Over-the-Horizon Radar (OTHR) systems in the Northwest region of the United States.

The purpose of this website is to share information with the public throughout the EIS process. Review this site for information on the proposed action, the status and schedule of the EIS, documents available for review, and opportunities for public involvement.

This website will be updated throughout the project, so please check back often for updates.

ANNOUNCEMENTS:

The Draft EIS public comment period closed September 19, 2026.  DAF appreciates your participation in the National Environmental Policy Act (NEPA) process.