Nov 15, 2021 · Standard Drawing 1821 - Mass Concrete Endwall - Pipe Culverts 600 to 900 Dia. [PDF 91 Kb] Standard Drawing 1831 - Mass Concrete Endwall - Box Culverts 225 to 450 High [PDF 95 Kb] Standard Drawing 1841 - Mass Concrete Endwall - Types 1, 2 & 3 Box Culverts 450 to 900 High [PDF 150 Kb]