Supervisors and festival organizers agree to mitigation plan after noise complaints; main stage to shut by 01:30

A prolonged public exchange over outdoor event noise ended Monday with Jefferson County supervisors asking event organizers and neighbors to collaborate on specific mitigation measures and an organizer giving a time‑limited commitment to change operations.

Neighbors described repeated disturbances from late‑night music and low‑frequency noise, asking the county for enforceable limits and a fixed shutdown time. Event organizers said the festival generates economic benefits, has safety and medical plans, and that reorienting stages, implementing directional sound control and installing temporary barriers could reduce impacts. Assistant county attorney (Speaker 8) presented a draft template the board could use as a starting point, noting Iowa’s public‑nuisance framework and that municipalities use a range of approaches.

After discussion, the festival’s representative (Speaker 12) committed to shut the main stage at 01:30 both nights and to work with county staff and impacted neighbors to test mitigation measures in the months before the next event. Supervisors urged an event‑permit template that includes noise limits, a defined shutdown time, safety and medical requirements and neighbor outreach. One resident said earlier shutdown times (midnight) would be preferable; event staff said 01:30 would strike a balance while allowing the event to remain viable. The board directed staff and negotiators to draft permit language and encouraged testing of sound attenuation measures at a neighbor’s property during daytime hours prior to the event.