Portland, OR. — The U.S. Army Corps of Engineers, Portland District, is accepting public comments through Feb. 4, 2026, on the proposed Cascade Renewable Transmission Project.
On Jan. 5, 2026, the agency issued a Notice of Intent to prepare an Environmental Impact Statement (EIS) under the National Environmental Policy Act (NEPA). The project would require a Department of the Army permit, Section 408 permission, and real estate outgrants to proceed.
“As part of the NEPA process, we collect public comments to help shape the EIS,” said Joe Brock, Portland District project manager. “Public input is crucial to ensure we consider all potential impacts and alternatives.”
The proposal includes installing approximately 78.9 miles of 12-inch high-voltage direct current cable beneath the Columbia River using hydroplow methods. The cable would be buried 10 to 15 feet below the riverbed, with a minimum depth of 34 feet below Columbia River Datum where it crosses the navigation channel downstream of Bonneville Dam.
According to the Corps, the transmission line is intended to support regional energy needs and economic activity. However, the agency noted the project could have adverse effects on aquatic ecosystems, fish and wildlife, navigation, recreation, water quality, and public safety. The project is also expected to adversely affect species listed under the Endangered Species Act, designated critical habitats, and essential fish habitat.
The EIS will evaluate potential environmental, ecological, aesthetic, historical, cultural, and social impacts, as well as alternatives to the proposed action.
The 30-day public comment period, which began Jan. 5, provides an opportunity for the public, agencies, organizations, and tribes to submit comments and suggestions for consideration as the Corps develops the EIS.
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