We ended up capturing 45 salamanders on Monday night, putting us over 100 for the year.
The animals in the video (sorry for the zoom, I underestimated the quality of the non-zoomed picture) below got to breeding shortly after I released them. All of the individuals are actually males here, but females soon joined the action and a decent swarm formed eventually. Notice the individual who stops and shuffles his hips back in forth; these behaviors are not well-studied, but he may be searching for spermatophores from other males to cover with his own. Also notice the tail-waving, this may be to disperse his scent through the water.
There should be eggs in there pretty soon!