Turn into Headwaters lodge and cabins at Flagg Ranch and take the first right onto Grassy Lake Road. There are 8 designated camping areas along the snake river heading to Grassy Lake Reservoir each camping area has between 1-4 sites a pit toilet picnic tables and fire rings. If you keep driving past camp #8 you enter the National forest and you can pretty much camp at any turnout you like- some spots will have nice fire pits but no other amenities. We ended up out here late on a Thursday night and all the designated sites were taken but we found a great spot to share with some other campers right near Grassy Lake.