I live in Oregon and some kids found a snake that's about 2 feet long, about a 2 inch circumference at its thickest point. It's primarily black, black bellied, with bluish green markings on its back. It doesn't look like any snakes found in this area, and is not a garder or ribbon snake. I'm hoping to find out what it is quickly. I'd post a pic but dont have a digital at the moment. Any help is appreciated.

Thanks.