Lead Mines Lighthouse was located on the western side of the lake, approximately southwest of the Molson's Island lighthouse. This was near Leadville, at the foot of Mount Owl's Head. It was built in 1878 as a white square wooden tower with a fixed white catoptric light located at a height of 20 feet above the high water mark and with a range of . The light had a focal plane of . It was rebuilt in 1914 and demolished on an unknown date.