If you have a vehicle, go to the Haystack bridge (across from the Harold Ellis rd.) Just after crossing the bridge there is two roads on your right, one right after and another 50-75m down the road. The closest one takes you to just around the corner to a nice hole that usually holds few fish, including some monster bulls.
The second road takes you to a nice campsite up river as well as access to more of the river.
The main bridge at 55k has a BC rec site on the left after the bridge that sites at the confluence of the Halfway and the Graham Rivers. Some good spots all along there. Opposite to the rec site is the Halfway rd that does have some access to the river in the first few KM before it gets to private land.
There is some good grayling, rainbows and bull fishing in the rivers, including bulls +20 lbs.
Here is a copy of the regs.
Good luck
Cheers
SS