Bonneville Power Administration and the Bureau of Land Management (BLM) jointly prepared an EA to assess potential environmental impacts of proposed improvements to the access road system for its existing Spar Canyon-Round Valley Transmission Line located on BLM land in Custer County, Idaho. Additional information is available on the project website at https://www.bpa.gov/efw/Analysis/NEPADocuments/Pages/SparCanyon.aspx.