If memory serves, the boat ramp was on the wider part that was straight and I don't know if that was 'crystal clear' or not. I think we were in a canoe or small rowboat, can't remember back that far. When we entered the windy water with cows it was shallower and VERY 'crystal clear' with big fish running from our lures. Would love to toss a dry fly in there some day.
I'm thinking it was the boat ramp looking thing just off northeast end of Agency lake which looks like it joins Wood River also. That's definitely the area.
You guys are the 'man', to pick an area out from a faily spotty description at best. haha. Maybe I'll fish that area someday...