Patent ID: 8708601

Claim:
A box culvert assembly comprising: first and second four-sided concrete boxes coupled to one another, the first and second boxes having first ends, second ends, and openings extending between the first and second ends; the first box comprising an upper protruding ledge, the protruding ledge having a distal most end comprising a first portion, a second portion, and a third portion in between the first and second portions, the first and second portions having a greater thickness than the third portion, the first and second portions of the distal most end of the protruding ledge being configured to support at least a portion of the weight of the first box when the first box is coupled to the second box, said first portion located at a first corner of the first box and said second portion located at a second corner of the first box; and the second box comprising a recessed ledge having a first receiving surface located adjacent to a top edge and a first side of the box and a second receiving surface located adjacent to the top edge and a second side of the box for contacting and supporting the first and second portions of the distal most end of the protruding ledge.