Tarkio children are invited to a Back-to-School Splash Thursday, August 10, 2017, at the Tarkio Municipal Pool. Youth ages Pre-K through 12th grade are invited to swim for free. Pre-K through 6th grade kids can swim from 6-7:30 p.m. and youth in 7th-12th grade can swim from 7:30-9 p.m.