I'm doing a streambank stabilization project in Ohio that will require some tree removal along a riverbank. Some trees must be removed for the work, and others will be removed because of their condition. I'm looking for some criteria for deciding when to remove a generally healthy tree. Generally, our client has been removing trees on the bank that lean more than 45 degrees. However, I think that is a little too arbitrary. I'm more concerned about undermining from the river, etc. It's necessary to remove trees that may soon fall into the river and cause an obstruction. Any input would be appreciated.