This is dock or wharf piling.
This lighthouse; Construction was virtually complete by May 1905. It sat on a platform measuring 50 feet by 80 feet; the platform itself was built on 117 piles driven 15 feet into the sand. The building was an octagonal structure measuring 62 feet by 28 feet. It was painted white with light green trim.
The building included a 27-foot addition on the east end of the platform with a large wood room and a porch on each side. The kitchen and dining room were immediately adjacent to the addition, in the east half of the building itself.
A smaller addition on the west end of the building's first floor housed the engine room, and contained the boiler for the heating plant as well as the engine for the foghorn. The horn was also in this room and stuck out of the wall on the outside of the building. The second floor (though the building is typically described as one-and-a-half stories) had three small rooms and a storeroom.
The light tower was 29 feet above the first floor, about 10 feet in diameter, and had a circular balcony. The station's water was provided by two 3,000-gallon tanks on the lighthouse's east side that were filled by rainwater from the roof.
The light was a fourth-order fixed Fresnel lens, and the horn was a third-class Daboll trumpet.
