From Boise, take Highway 21 across the Mores Creek bridge (about 15 miles from town) and immediately take the turn towards Spring Shores and the road to Atlanta. This road is paved until Arrowrock Dam, then turns into a slow, bumpy dirt road for the next 50 or so miles. There is no defined trailhead or starting point. Just refer to the map on this page. If you get to Snyder Creek or the Queens River Campground, you have gone too far. Plan on the drive from Boise taking about 2 1/2 hours or so.
Also, no facilities.