The “BOOM & a Blast” fireworks show at Cooper’s Lake Campground in August brought in more than $4 million to the Butler County economy, according to the county tourism bureau.

Jack Cohen, president of the tourism and convention bureau, said at the bureau’s board meeting Thursday night that more than 55,000 people came to see the spectacle that ran from Aug. 10 to 16.

The weeklong event was organized by the Pyrotechnics Guild International.

There were four large fireworks displays for the public as well as seminars and workshops for PGI members, who built their own fireworks on site.

Some of those people also contributed to the 6,240 room nights booked in hotels, a figure included in the economic impact report.

Cohen said the tourism bureau, which hosted the event, spent about $150,000 to bring it here. Businesses donated more than $37,000 as sponsors to help defray costs.

Costs were further reduced by Rotary club members, who volunteered to help park the thousands of cars that streamed into Cooper’s Lake on the four nights of the public fireworks displays.

Cohen said the tourism bureau received a tremendous return on its investment after more than five years of planning the event.

He also said the PGI group sent a letter thanking the bureau for such a wonderful event, and added that it hopes to come back to the area for another festival in 2017.

“We’re definitely trying to get them back here,” Cohen said.

The tourism bureau’s board met Thursday night at Butler Memorial Hospital.

The evening also included a quarterly general membership meeting.