Keweenaw Waterway Lower Entrance Light, Navigational lighthouse in Torch Lake Township, Michigan

Keweenaw Waterway Lower Entrance Light is an octagonal steel tower rising 19 meters above the lake, with a white exterior, black lantern room, and red roof. It stands on a rectangular timber foundation supported by a concrete pier.

The Portage River was first dredged in 1860, and Congress appropriated $7,500 in 1866 for range lights built here in 1868. After the federal government bought the Keweenaw Waterway in 1891, the Army Corps of Engineers added a breakwater and western pier by 1898. A wooden tower of 1902 gave way to an iron tower in 1911, and Congress set aside $100,000 in 1917 for new aids; this lighthouse was built in 1919–1920 and automated in 1973.

This structure represents early 20th century Great Lakes maritime engineering, with its design reflecting practical solutions for guiding ships through the narrow Keweenaw Waterway entrance.

The lighthouse is best viewed from the water during the shipping season when the waterway is active. The modern LED light system projects visibility up to 9 nautical miles, helping vessels navigate in poor conditions.

The fourth-order Fresnel lens moved from the earlier pierhead light into this tower in 1920 and served until 2010, when a SABIK LED-350 two-tier optic took its place. The original brass pedestal still stands at the centre of the lantern room floor, and the light shows a white flash of 0.6 seconds every 6 seconds, visible for 9 nautical miles.