Tanner Amphitheater is oriented toward the dais on the north side of the structure. The dais is wide and deep, and is large enough to seat 300 people. The dais is constructed of brick, with decorative blind corbel arches on all four sides. A four-tread set of stone steps provides access on the east and west sides. Twelve smooth, round columns, made of brick, support a trellis overhead. Each column is topped by an Ionic capital. Each column has a two-stepped, round base with egg-and-dart decoration, below which is a simple square plinth. The capitals and bases are made of cast iron, and the brick columns clad in smooth stucco. The trellis above the dais is formed by beams, which are made of two planks bolted together. Two beams form a girder. Girders run east and west and north and south, connecting all the columns together. Joists made of planks connected to the top of the girders with halved joints. These joists form most of the trellis structure on which plants climb. There are six joists between each east-west column, and one between each north-south column. The deck of the dais consists of stone pavers over fill earth. A low, simple, wrought-iron railing surrounds the dais on the east, west, and north sides.