Hi Lisa:
Timber values can be estimated quite easily by getting a professional consulting forester involved. It makes very little sense to cut your trees and then value them; rather, it makes much more sense to have prior knowledge of your timber's value before any trees are harvested.
In fact, you should contact a professional consulting forester to assist you in the marketing, sale, and administration of your standing timber as you'll make more money and harvest fewer trees!
Michigan Consulting Foresters: http://www.for.msu.edu/extension_outreach/consulting_foresters
