The two courses at Whistling Straits were designed by Pete & Alice Dye.
The Straits Course replicates the ancient seaside links courses of the United Kingdom and the Republic of Ireland. Nestled along a two-mile (3 km) stretch of Lake Michigan, the course features vast rolling greens, deep pot bunkers, grass-topped dunes and winds that sweep in off the lake. At 7,514 yards, it is the second longest course to host a major.
The seventeenth named "Pinched Nerve", the unofficial signature hole, is the most difficult par-3 on the course. At 223 yards, with towering sand dunes and the lake to the left leaves golfers with no option but to go straight for the green.
The course also features two miles (3 km) of shoreline on Lake Michigan, eight holes hugging the lake, a flock of Scottish Blackface sheep, elevation changes of approximately and three stone bridges at holes 9, 10 and 18.
Although the Straits Course duplicates British and Irish links layouts, its original state was not linksland. Before the course was built, the property was a more or less featureless abandoned airfield called Camp Haven (1949-1959) , with a stream running through the middle. Its one saving grace, from a golf standpoint, was its two miles (3.2 km) of lake frontage. Kohler Company CEO Herbert Kohler signed up Dye as course architect, giving him a basically unlimited budget. During construction, the original landscape of the Straits Course alone was covered with about 800,000 cubic yards (610,000 m³) of dirt and sand. Until recently, the amount of earth moved would have been considered extreme for a golf course, but this amount has been dwarfed by that required by several other courses, most notably Shadow Creek in Las Vegas, where 25 million cubic yards (19.1 million m³) of earth were moved.
Having served as a PGA Championship host site, the Straits course has more notoriety. However, the editors of the noted independent golf travel newsletter, Golf Odyssey, view the Irish Course as much more difficult to play as it is trouble-filled with forced carries, gnarly rough, ponds, streams and ravines. that set the table.
Along with these obstacles, the Irish Course is laden with tremendous waste bunkers — tremendous in size and number — which are minimally maintained to let the elements shape and reshape them. The strength of the Irish course, along with its three sister courses, led Golf Odyssey to denote Kohler as "the best 72 holes of golf in the world".