mJoin the Sioux County Conservation Board in celebrating the 100th Anniversary of Oak Grove Park on Saturday, June 28th! The fun starts with the Oak Grove Passport Hiking which starts at 9:00 am. Lawn games will begin at 1:00 pm and the event will include live animal and history programs, cruise and park, a free concert from the Singer Family Band, a modern picnic and more. For more information on the Oak Grove 100 Year Celebration, visit SiouxCountyParks.org