He might not have known it at the time, but Dave Genz was making ice fishing history in 1980 when he built the first flip-top portable ice fishing shelter in the garage of his Twin Cities-area home.

The sprawling 150,000-square-foot new headquarters of Clam Outdoors off busy I-94 in Rogers is light years away from Dave Genz's garage, where he started hand-making "Fish Trap" portable ice shelters ...