The James E. Mansfield Gymnasium features both a main gym area and an auxiliary gym. The main gym has bleacher seating with a capacity of 1,000. A new gym surface was installed in 2011. In recent years the walls have been painted, new banners added and new wall pads installed giving the facility a fresh look. The gym now features a new Hudl Focus camera. This new innovation uses three cameras that capture all of the action in HD automatically. This provides the capability to stream action live for several sports. 

The gymnasium is home to the Haverhill High School boys & girls basketball teams, boys & girls volleyball teams, the wrestling team and the Unified basketball program. The facility is also used by the high school physical education classes, middle school sports teams, summer camps and several community programs.