Texas State Highway 275State Highway 275 is a Texas state highway running along the northern side of Galveston Island from Interstate 45 to State [Highway 87 (Texas)|SH 87].Route descriptionSH 275 begins at a junction with I-45 in Galveston. It initially heads north, but turns towards the east as it heads through Galveston. SH 275 reaches its eastern terminus at a junction with Texas [State Highway 87|SH 87] in Galveston. The highway is also known as Harborside Drive.HistorySH 275 was originally designated on August 1, 1938 on a route from Mabelle to Jimtown. This was cancelled on November 24, 1941. The current route was designated on February 23, 1993.