Heavy D
Contributor
You know you're near the stairs because the water temp drops about 5 degrees. I guess from the little side stream coming in at that point. We could feel it even from the other side of the river.
That is a good indicator when you are doing the upper. Also in the upper, there is an eye bolt and a piece of rebar near the center of the river right before the stairs. The lights from the park are a good indicator too.
For the lower, the way that I usually tell that I'm getting close to the end is that during my zig-zags, once I run into a wall made out of those stacked bags of cement on the left bank as I'm facing downstream, then I usually surface real quick for a peak to see how far upstream I am still or I just stick to the left bank from that point on. There really isn't a good indicator underwater. There used to be some stuff to cue off of but it has been removed over the years.