If Iowa Department of Transportation determines that dredging is essential to construct the project, then the Iowa DOT will pursue
approval of dredging in the 404 permit application. This typically includes dredging inside
cofferdams, barge slips, removal of sand bars to improve water flow, etc.
If the Iowa DOT determines that dredging in the project area is not allowed, due to environmental or other
concerns, then the Iowa DOT will include a Standard Note 282-2 in the plans clearly stating that dredging of any
type is not allowed and the reason why.
When not specifically disallowed by the Iowa DOT, contractors may elect to pursue their own approvals for the
use of dredged materials, provided those approvals are in accordance with Articles 1105.14 and 1106.07
and there are no environmental concerns. Elective items typically include the use of dredged materials
for causeways constructed according to Standard Road Plan EW-401, work pads, etc. The Iowa DOT will inform contractors of
relevant information about stream conditions as much as possible based on specific questions provided
via BIDX. Please note that Iowa DOT obtains approval for temporary structures constructed according to Standard Road Plan
EW-401, but not for the source of materials used within those structures.
In general, 404 permits require that materials excavated/dredged from the stream be removed to
upland, non-wetland locations when no longer necessary for construction of the project.