 US Engineer Depot, Yerba Buena Island and a.k.a.US Quartermaster Depot, Yerba Buena Island) by Navy Road and North Gate Road was completed, including a fog signal and octagonal lighthouse called Yerba Buena Light (1875) that remain today at the end of Hillcrest Road.In 1891, the United States Army Engineers (now known as the United States Army Corps of Engineers) built a Torpedo Station / Shed / Storehouse / Assembly building (Building 262) at the end of Army Road by North Gate Road.