Ahupua'a 'o Niu - The Old Niu Valley Pier

In Maunalua Bay, in the ahupua'a of Niu in the Kona district of Oahu - up until sometime (approx.) in the late 1970's or early 1980's there was an old pier that extended out in front of Niu Valley (just Diamond Head side of Niu Peninsula or Niu Iki Circle (once an ancient fish pond named Kupapa). The old wood plank pier extended out approx. a 1/4 mile over the reef flat or about 2/3rds of the way to the breakers from the beach.

There was a platform on the very end of the pier (maybe about 10 ft x 10 ft) with a metal ladder. The pier was used when I was a kid for playing, fishing, flying kites off the end of and for a shorter paddle out surfing. We had some great games of king of the pier there. King of the pier consisted of pushing others kids, who wanted to play, off the end of the pier into the water and the last one standing on the pier was the winner (I was usually one of the first to get thrown off and don't ever remember winning the lucky title of king of the pier).

Does anyone know when the pier was originally built and for what purpose? Did it have something to do with the cattle & dairy ranches that were in this area before residential development? The pier was in disrepair when we played and walked on it as kids. Some of the planks were very springy.

Also, in Maunalua Bay - old rusting metal piles are in the water to this day off Paiko peninsula in front of the neighboring ahupua'a of Kuliou'ou. What structure or function were these piles originally a part of? There is no channel adjacent to the piles; however, there is a channel running parallel to the shore in front of Kuliou'ou Beach Park (appor. 50 yards off-shore). The piles are on the reef flat directly outside Kuliou'ou stream outlet adjacent to Kuliou'ou Beach Park.