Mariner High School enjoys a rich heritage as the first high school in the District. Opened in 1971, the building originally offered 178,000 ft.² of usable space. In 1983, a weight room was added and in 1994, office, auxiliary gym, and theater spaces brought the total square footage to 198,219 ft.². Currently, the school has two gymnasiums, swimming and diving pools, a 162-seat theater, six computer labs, a publishing center, a photo lab, and 78 classrooms. Fourteen portables add to classroom space. Completing the site is Goddard Stadium, with an approximate seating capacity of 2500, opened in 1972, and modernized in 1990, 1995, and 1996. The field hosts district-wide track and field, football, and soccer events.

Ethnically, racially and economically diverse, Mariner High School provides students with cultural richness and exposure to all aspects of a vital community. A Career Center and Career Pathways program provides assistance to students who transition from school to work. Athletics play a large part in Mariner's offerings and in 1998 the Marauder football team placed second in the WIAA state standings.

Mariner High School currently serves about 2100 students from diverse backgrounds and will receive many more updates throughout 2022-2024 thanks to the voter-approved 2020 Capital Bond.

Mission statement

We will provide opportunities for all individuals to reach their full potential. Our goals are to promote respect and dignity for all; set high expectations for all students and staff; involve all groups when making decisions which directly affect them; provide opportunities and encourage involvement in service to school and community; and create a safe and healthy learning environment.