From Hagg , the road is gated in several spots. Google will send you on Patton Valley rd through cherry grove. You can also access it from these other roads, Old Rail Road Grade, Pike Rd, Old Scoggins Vly Rd, Flora Mainline, 500 line Rd, Neverstill Rd, Gales creek Rd, North Fork Trask Rd. All of the these roads are in the Eastern vicinity of the reservoir and any of them will connect to one that will get you to the water. I do remember a way up there from the Tillamook side, probably gated now too. If you google map your location and type in Barney Reservoir as your destination, you will get a nice short and sweet route to the water. There are so many lakes and ponds up in the hills.