Section 2416 Revised 10/20/2020 Iowa Department of Transportation
A. 1500D (Class II) pipe may be used for entrance culverts only. Use 2000D (Class III), 3000D (Class IV), or 3750D (Class V) pipes for roadway culverts, or if conditions require, for entrance culverts. Table provides minimum and maximum allowable pipe sizes. * 15 inch entrance pipes allowed on noninterstate and nonprimary.