I've also got a call into the school district of the elementary school around the corner where we vote. The school across the street is one of those "last chance inns" for juveniles and I will walk across in the morning and talk to someone personally.
I would just be sick if something happened and I (or law enforcement) hadn't warned them. Even if NOTHING happens, I'm one of those "better safe, than sorry" types.
You're doing the right thing, and I also think you're very brave.