does anyone have an updated phone number? or is this one not working because of the cyber attack?

There isn't an office or phone for this location. If you need to get ahold of someone, the USDA forest service office in Winona, Missouri might be your best option.

Greer crossing is a bridge over the eleven point and a conservation campground. No phone, me service there either. It's first come first serve, bathrooms and a water spicket at bathrooms.