Coastal rules do not apply in Johnson County. This is landlocked eastern Iowa. Work near water here follows Iowa DNR floodway permits, local floodplain ordinances, and Army Corps rules around Coralville Lake.
There is no ocean or Great Lakes shoreline in Johnson County, so no coastal-development permit or shoreline setback exists. The waters that matter are inland: the Iowa River, Clear Creek, and Coralville Lake, the US Army Corps of Engineers flood-control reservoir behind Coralville Dam. Building, filling, or excavating in a mapped floodway is governed by an Iowa DNR flood plain permit under Iowa Code Chapter 455B and Iowa Administrative Code 567 Chapters 70 to 72, not by any coastal statute. Around Coralville Lake the Corps manages the shoreline and flood pool, and Johnson County plus Iowa City and Coralville administer the local NFIP floodplain program.
No coastal permit exists to violate. Placing a structure, fill, or excavation in a floodway without the Iowa DNR flood plain permit is a public nuisance the department can enjoin, abate, or condemn at the violator's cost.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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