It is south of Des Moines just east of HWY69. It is the road that runs east/west just north of the middle river.
It is fenced in and now has posted hours. IIRC it is closed Wed and Thur. You drive about 75 yards past the entrance gate and shack to the benches which point to the east. The benches are all on concrete slabs with a roof over them. The longest range is 100 yards. However, in order to shoot down range you must shoot through a 10 foot long concrete tube that runs through the berm. The tubes make for a fairly unpleasant experience. They are located at both sitting and standing heights, so you can feel the revebration while shooting from a variety of poses.
It looked like there were 3 permanent clay throwers off to the south, but I didn't look closely and may be mistaken as to what they were.
It looks like they are set up to collect money, and I am guessing they will collect a fee for range use in the future. When that happens I reckon I will save the money and test the reloads on trips to places where it is more fun to shoot.
To their credit, they did put effort into making it a nicer place. The tubes sucked before they jazzed it up too.