Eagle River Light, a decommissioned lighthouse at the mouth of the Eagle River on Michigan’s Keweenaw Peninsula, arose from the region’s copper boom after Eagle River became an important port following the 1845 discovery of the Cliff Lode. Though authorized in 1850, delays postponed completion until 1857. Perched above Lake Superior, the light was highly visible but structurally vulnerable, and deterioration soon threatened collapse. Even as mining declined and the harbor grew idle, it remained the only marked point along this stretch of shore. Decommissioned in 1908, it survives as a private historic property linked to the peninsula’s mining economy, maritime dangers, and difficult navigation.