If you see a fire near Marr Park this Friday night…don’t be alarmed. The Washington County Conservation Board will be holding a controlled prairie burn. Naturalist Pam Holz says prairie lands need to be burned off periodically. Holz says the burn also helps keep invasive species out. She says the event can be quite spectacular to see. The public is invited to an informational session Friday April 3 at the Park at 7:30 pm. The burn will take place at 8:00. Holz says it can happen very quickly, and urges attendees not to be late.