Halfmoon Reef Lighthouse, Maritime beacon in Port Lavaca, Texas, US

Halfmoon Reef Lighthouse is a white wooden hexagonal keeper's house mounted on seven iron screw piles, topped by a red lantern about 6 m (20 ft) high. It was originally built on the reef in Matagorda Bay and now stands at Broadway Street and SH 35 in Port Lavaca.

Congress approved funds in 1854 for a screw-pile light on the southern end of Halfmoon Reef, and seven iron pilings, each 25 feet long, arrived by barge from Baltimore via Galveston. The light was finished by July 1, when a sixth-order Fresnel lens showed a fixed white beam; complaints that it resembled Matagorda Island Light led to a red glass chimney. Confederates darkened it during the Civil War, and it was relit on February 20, 1868. After the 1886 hurricane the Lighthouse Board deactivated it, removing the lens but leaving the structure as a daymark.

The lighthouse served as a home for keeper families who lived and worked here together, shaping the rhythm of life in this isolated maritime outpost. Residents developed routines around the daily tasks of maintaining the beacon and watching over the bay.

The lighthouse stands at the corner of Broadway Street and Highway 35 in Port Lavaca, right next to Bauer Community Center. Visitors can easily access the structure from the street and explore the surrounding area.

The structure survived the devastating 1875 hurricane that destroyed two similar lighthouses nearby. It remains the last screwpile lighthouse standing in Texas.