The mission church is a simplified, vernacular example of Gothic revival architecture constructed of bricks made from native clay. The most exceptional feature of the interior are the 58 murals painted by Brother Joseph Carignano, an untrained artist who worked as a cook in the mission.[5] The murals include depictions of Christian imagery mixed with representations of the Salish belief system.[6] The church is 120 by 60 feet (37 m × 18 m) in plan and its belfry is nearly 100 feet (30 m) high.[3]