Stopped here upon realizing that we wouldn't make it all the way to Castle Rocks State Park that night and it was starting to rain.  Plenty of sites available on a Thursday night in mid-March.  Bathroom facility available in the middle of the campground.  Pull-in spots are a bit small but we just had the pickup and a tent so we did fine.  Cool views in the morning of the Snake river.  Biggest drawback is that the campground sits barely off the interstate so there is a quite a bit of road noise. Not sure I'd make it my go-to camping spot but it worked for what we needed.