Multiple pull offs on Hungry Horse RD
The GPS coordinates for this place are slightly off. Look for Hungry Horse Rd and follow it 4 miles until you reach the Hungry Horse Reservoir Dam. Dispersed camping is allowed anywhere along the road after the dam.
Plenty of places to pull off, the road goes for miles. There are also many established state campgrounds along the road. The sites that I saw were nothing fancy, some with fire rings and some not. I read about some places that are nicer if you take the fire roads that branch off the main road, but I came in late and just used a pull-off. I'd recommend going to the Ranger station located in Hungry Horse and ask for some dispersed camping information (The area is very large).
No services, pack in, pack out. No reliable service for Verizon.