An enhanced strength grade level utility enclosure for underground utilities connections, comprising: a substantially vertical wall structure (12, 14) extending continuously around an open interior region within the wall structure (12, 14), the wall structure (12, 14) made of a molded polymeric material; the vertical wall structure having an upper edge extending around an opening to the interior of the enclosure and a bottom edge on which the enclosure is supported; a removable cover plate adapted for mounting to an opening in the grade level enclosure to close off at least a portion of the interior region from the environment, the cover plate adapted to engage at least a portion of the enclosure's upper edge structure; the vertical wall structure including an upright inner wall panel extending from the upper edge to the bottom edge of the vertical wall structure, the inner wall panel having an upright inside face spanning the interior of the enclosure; the inside face of the inner wall panel having left and right sides opposing one another; one or more narrow, vertical slotted regions recessed in the inside face of the inner wall panel on the left side and on the right side of the enclosure extending from the upper edge to the bottom edge of the inner wall panel; and an upright rigid support bar adapted for use as a cable rack positioned in at least one slotted region on each side of the wall structure's inside face; the support bars having a flat continuous face flush with the inside face of the inner wall panel defining a cavity within the slotted region behind the flat continuous face, the support bars providing substantially continuous rigid vertical support extending from the upper edge to the bottom edge of the enclosure's vertical wall structure (12, 14). a substantially vertical wall structure (12, 14) extending continuously around an open interior region within the wall structure (12, 14), the wall structure (12, 14) made of a molded polymeric material; the vertical wall structure having an upper edge extending around an opening to the interior of the enclosure and a bottom edge on which the enclosure is supported; a removable cover plate adapted for mounting to an opening in the grade level enclosure to close off at least a portion of the interior region from the environment, the cover plate adapted to engage at least a portion of the enclosure's upper edge structure; the vertical wall structure including an upright inner wall panel extending from the upper edge to the bottom edge of the vertical wall structure, the inner wall panel having an upright inside face spanning the interior of the enclosure; the inside face of the inner wall panel having left and right sides opposing one another; one or more narrow, vertical slotted regions recessed in the inside face of the inner wall panel on the left side and on the right side of the enclosure extending from the upper edge to the bottom edge of the inner wall panel; and an upright rigid support bar adapted for use as a cable rack positioned in at least one slotted region on each side of the wall structure's inside face; the support bars having a flat continuous face flush with the inside face of the inner wall panel defining a cavity within the slotted region behind the flat continuous face, the support bars providing substantially continuous rigid vertical support extending from the upper edge to the bottom edge of the enclosure's vertical wall structure (12, 14).