Arapahoe Bar is a good area, but just not now. I was several miles east of the Bar today and the water is very high. Something like 950 cfs. In March I could walk all the way across the creek. Not today, It was very hard to find any place to put in a sluice. I was out with a group and we had so little of an area that we had four sluices set up side by side. Maybe by the time you get here the water level will come down some.
It's dangerous so don't attempt to cross the creek.
Good luck and have fun.