If you access the Canyon from just above Wigwam there is great fishing that is very walkable. The walk in is not much at all, though the trail up into the canyon can get a bit rough as you go along. It's well worth it and the scenery can't be beat. Took a buddy up there recently, he didn't catch anything, but the experience convinced him to get a fly rod
When you say the road is closed, do you mean the dirt road that heads up just before the lower parking lot, and around the north and west side of the mountain towards the dam, or the road from the upper parking lot where the upper trail access begins down to the reservoir itself? The upper access trail is a much tougher hike in, but is very doable and also enjoys some great views. The view of the dam itself is really worth it. Access down to the river is tough, lots of loose rock but I've found the fishing to be great.