If you look at the time lapse for the camera I posted to, you can see the fire started at the dam itself (camera operators @ SCE zoomed in). The fire is burning up canyon to the northwest, the trail to Cogswell dam runs east out of that canyon to Azusa. People who might be in danger are anyone on the north side of the reservoir. I'm not sure if you are allowed to fish out of the reservoir. As for Azusa canyon, I'm sure it's a zoo on a hot holiday like this. The dam is some distance from highway 39 though. Fortunately they'll be able to evacuate both down the canyon, and they will almost certainly open the gate at the closed section @ Angeles Crest Hwy to let people out of the top of Azusa canyon/Crystal Lake.