IL HB4502

Amends the Rivers, Lakes, and Streams Act to add new Department of Natural Resources requirements for levee improvements and waterway construction.

Department must provide notice of submissions, detailed timeline, specific requirements, and internal review procedures to permit applicants within 90 days.

Permits water surface profile increases of 0.5 feet for rural construction and 0.1 feet for urban construction along navigable waterways.

Requires mitigation analysis only when water surface profile increases exceed the induced head study threshold (0.5 feet in rural areas, 0.1 feet in urban areas).

Effective immediately upon becoming law.