For Jurisdiction Streams, what is the maximum impact before stream mitigation is required. I know for wetlands it is 1/10 of an acre, but what is it for stream? X-amount of LF. Or is it in acres?

Its measured in linear feet.

The state of Tennessee has a set of guidelines (direct link to PDF download)here. http://www.state.tn.us/environ...gationGuidelines.pdf

Check with your local COE district for specific guidelines.