Great Lakes Timber Professionals Assoc. Share: Non-Profit/Service Organization Great Lakes Timber Professionals Assoc. Visit Website 3243 Golf Course Rd Rhinelander, WI 54501 (715) 282-5828 (715) 282-4941 (fax) LinkedIn Facebook About Map About We've provided proven leadership in the Lake States Forest products industry for over 70 yrs. GLTPA is a non-profit organization proud to represent members in WI & MI. Committed to forest management. What's Nearby? Distance: 5 10 15 20 25 50 mi.