Is it about 8mi each way, or do you have a closer spot to start from? I've looked at that one before just for the scenery...seems like the fishing must be OK if you make that walk2 mph is a good speed if you are loaded. 30-50lbs. if just a light daypack 3 mph is good.
Abyss lake is a 8 mile 3,000 ft elevation gain to 12,650 ft. Takes me about 3.75 hrs in, 2.5 out.