Register for the New Year’s Day Polar Plunge event! December 14, 2023 admin Ring in the New Year with a quick dip in the Columbia River! The annual Polar Plunge is just around the corner. NEW YEAR’S DAY at maryhill state park Check-in Time: 9:30am to 9:55 am Participants Meeting: 9:55am Plunge: 10am sharp! SUGGESTED DONATION $15