Iowa Admin. Code r. 567-71.1

Current through Register Vol. 47, No. 11, December 11, 2024

Rule 567-71.1 - Bridges, culverts, temporary stream crossings, and road embankments

Approval by the department for the construction, operation, and maintenance of bridges, culverts, temporary stream crossings, and road embankments shall be required in the following instances.

(1)Rural area-floodway. In rural areas, bridges, culverts, road embankments, and temporary stream crossings in or on the floodway of any river or stream draining more than 100 square miles. (Note: Channel modifications associated with bridge, culvert or roadway projects may need approval; see 567-712. (455B).)

(2)Rural area-floodway and flood plain. Road embankments located in the floodway or flood plains, but not crossing the channel of a river or stream draining more than 10 square miles, where such works occupy more than 3 percent of the cross-sectional area of the channel at bankfull stage or where such works obstruct more than 15 percent of the total cross-sectional area of the flood plain at any stage. In determining a 15 percent occupancy of the flood plain, the concept of equal and opposite conveyance as defined in 567-Chapter 70 shall apply.

(3)Urban areas. In urban areas, bridges, culverts, road embankments and temporary stream crossings in or on the floodway or flood plains of any river or stream draining more than 2 square miles.

Iowa Admin. Code r. 567-71.1