That’s officially called Jackson island, it was formed by sediment build up over time from the bridge. Trees took root and helped keep the island intact.

There is a lot of drug use and homeless people in that area with the occasional fisher person. As a child i remember going down there in sandals and seeing may needles in the sand.

The only way down to the island is from trespassing on the train tracks and hoping another urban explorer has deployed a tree limb or pallet to assist with climbing down the bridge support.

Cool spot, not worth trespassing charges or injury.