X0101 EFFECT 33 LIVE 2017-04-10 0000711080-17-000019 485APOS 0000711080 TOUCHSTONE STRATEGIC TRUST 002-80859 S000055861 Touchstone Ohio Tax-Free Bond Fund C000175943 Class A S000055861 Touchstone Ohio Tax-Free Bond Fund C000175944 Class C S000055861 Touchstone Ohio Tax-Free Bond Fund C000175945 Class Y S000055861 Touchstone Ohio Tax-Free Bond Fund C000175946 Institutional