When Department Approval is Required Per IAC Chapter 71
Approval by the department for construction, operation, and maintenance of miscellaneous structures, obstructions, or deposits, shall be required in the following instances.

71.12(1) Rural areas. In rural areas, any miscellaneous structures, obstructions, or deposits on the floodway or flood plain of any river or stream draining more than 10 square miles where such works obstruct more than 3 percent of the cross-sectional area of the stream 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 obstruction of the flood plain, the concept of equal and opposite conveyance as defined in 567-Chapter 70 shall apply.

71.12(2) Urban areas. In urban areas, miscellaneous structures, obstructions, or deposits on the floodway or flood plains of any river or stream draining more than 2 square miles.

Application Forms, Checklists & Guidance:

Application Form(s)	*.pdf
Joint Application Form
Application Guidance	*.pdf
N/A
Application Checklist(s)	*.pdf
Project Information Checklist for Miscellaneous Structures, Obstructions, or Deposits

Aerial photographs can be obtained online at: http://ortho.gis.iastate.edu/search.html.