Not in front of me, but I do know it's a Level 2 version of the Black Dragon in the Monster Vault. It only had 144 HP.
My group of 5 almost trounced it. Fortunately, the bolt holes gave it a mobility advantage. The tables turned pretty drastically in one round. At one point, two characters were dying. But they pulled through.
What started off as a shockingly lame encounter turned into the memorable one I had hoped for.