Grand River.
I go to Grand River Wildlife Management Area. Just short of 3,000 acres of hunting land with a small bit set aside for a shooting range. 25, 50 and 100 yard lanes, half covered, the rest open to the sun on good days and the rain on bad days. Double taps allowed, but no sustained rapid fire, everything but .50BMG allowed. No centerfire rifle on the 25, though. Nice little range.
24 dollars per year, 5 bucks for a day pass. Closed January and February, closed to the public Mondays and Tuesdays due to police use.
The best part? 14.8 miles from my house.