It is a part of Calcasieu Parish Public Schools and was established in 1914.

Arnett organized the establishment of a high school building on Sulphur Avenue.

A new high school building was added to the Sulphur Avenue campus in 1949.

[2] The current complex includes; along with classrooms, administrative space, and faculty lounges; six lecture halls/science rooms, a 1,000-seat auditorium, a library, a cafeteria, band rooms, a vocational workshop, a business laboratory, chorus rooms, a writing and language laboratory, and two sickrooms.

[2] Westlake High athletics competes in the LHSAA.