Arrowhead Park clean-up day set in Ottawa Arrowhead Park clean-up day; 10 a.m.-3 p.m., southeast of the Blanchard River at the U.S. 224 bridge in Ottawa. OTTAWA — The Village of Ottawa Greenspace Development Committee will hold a clean-up event at Arrowhead Park from 10 a.m. until 3 p.m. Saturday, April 24. The clean-up will include brush removal, small tree removal, raking/gathering sticks, trash pick up and hauling waste to the village brush pile. People who plan on participating are asked to reply with a time they can volunteer and what tools they plan to bring by contacting Tim Macke at...