Prior to the establishment of passenger service, the site of Great River Station was occupied by a freight only station built by the South Side Railroad of Long Island known as Youngsport Station. Great River Station was originally built in 1897 but burned down in 1943. Between that time, a sheltered-platform was added to the other side of the tracks. In 1945 a modernist station designed by architect Antonin Raymond replaced it, but it was burned down in 2000. The third station with high-level platforms was built between 2000-2001. The original shelter, however was restored by the East Islip Historical Society, and remains within one of the parking lots at the station.
East of Great River Station, the SSRRLI built a private station called Club House Station in 1869 to serve the South Side Sportsmen's Association This station was located between Mileposts 45 and 46 inside today's Bayard Cutting Arboretum, and was among a number of privately owned stations along the SSRRLI, which weren't so uncommon during the 19th Century. It was closed in 1897.
This station has two high-level side platforms each four cars long. The north platform, adjacent to Track 1, is generally used by westbound trains. The south platform, adjacent to Track 2, is generally used by eastbound trains. The Montauk Branch has two tracks at this location.
- Suffolk County Transit: S40, S3C.
- Local Taxi Service