Water Sports Second to None. Lake Koocanusa is by far the “Best kept secret in the United States”. A 90 mile long lake that extends outside of Libby Montana and into Canada, offers a water enthusiast paradise. If one can keep their mind and sight focused off the beauty of the surrounding mountains, he or she might enjoy fishing,boating,sailing or swimming on this pristine lake. Lake Koocanusa ends at the Libby Dam, where a 422 foot tall dam with a visitor center is a must see attraction. From this dam, the Kootenai River is formed that offers some of the best fishing in the world. This Blue Ribbon stream is home to the world record Rainbow Trout weighing in at 33 !/2 pounds. The Kootenai River has miles of float fishing and relaxation for all to enjoy. Are you ready to break that world record? Please enjoy the pics below. Click on the photo to pop up an enlarged version.