Overlooking the campus of Mansfield University, Decker Gymnasium has been the home of Mountaineer men's and women's basketball since 1970. The complex was dedicated in honor of Marion "Spotts" Decker who served as Athletics Director and the Chairman of the Health and Physical Education Department from 1946-1965. Decker graduated from Mansfield State Normal School in 1924.
The three-story sports complex includes the main basketball arena with permanent seating for 1,600 fans and can be expanded to accommodate 2,500 fans for championship and concert venues. Brand new seating was installed prior to the 2008-09 season and a completely resurfaced and redesigned floor was completed at the end of summer 2012.
An upgraded and expanded sound system was installed in early 2018 to provide a high quality audio experience for fans and student-athletes. The system features four speakers facing the crowd and two directed at either side of the basketball court.
The 25-yard indoor pool seats up to 600 spectators for competitions. The facility has been updated with new starting blocks and a touch-timing system in recent years.
The building also includes administrative and coaching offices for athletics as well as classrooms, meeting rooms and locker rooms for each sport. The main lobby contains the Athletic Hall of Fame display.
Decker is home to the fully equipped physical therapy and athletic training suite along with an athletic weight room.
The Sports Information Multimedia Room located on the second floor of Decker houses state-of-the-art photography and video production equipment for headshots and feature videos. The multimedia room is available to members of the media for player and coach interviews.
The Decker Weight Room is part of the Marion Decker Gymnasium complex and is located on the first floor of the building below the basketball court. Following the addition of Mansfield's first full-time strength and conditioning coach in 2015, the facility has transformed into one of the best in the conference.
In 2016, the facility doubled in size with the addition of an attached room complete with new flooring and a 25 x 5 yard indoor turf area for all-season training. The new area also features a pull-up bar station complete with TRX suspension trainers, speed and agility equipment (two drive sleds, parachutes, weighted vests, and bands for sprint resistance), and core and plyometric training equipment (medicine balls, stability balls, sand bags, tractor tires, bosu balls, bands, mini bands, hurdles, kettle bells and battle ropes).
The existing weight room area has seen the addition of four squat racks, two new functional trainers (cable machine), new weight plates, and new Olympic, power and trap/deadlift bars.
The facility has also seen an upgrade in appearance with new signage featuring former Mansfield student-athletes adorning the walls.