The 2006–07 season added the Ohio Junior Blue Jackets as an expansion team.
The 2007 Clark Cup playoffs featured all twelve teams playing in division-based seven-game series in the opening round, followed by a quarterfinal round-robin where the winners of the opening round play each other team once.
The semifinal match-ups were made by pitting the top teams in the two round-robin series against the second-place team from the opposite division in a single-elimination game with the two victors meeting in a single-game championship match.
Final standings[2] Note: GP = Games played; W = Wins; L = Losses; OTL = Overtime losses; SL = Shootout losses; GF = Goals for; GA = Goals against; PTS = Points; x = clinched playoff berth; y = clinched division title; z = clinched league title [3] The first two rounds are restricted to intra-division matchups.
Waterloo Black Hawks vs. Chicago Steel Waterloo wins best-of-seven series 4 games to 1 Cedar Rapids RoughRiders vs. Ohio Junior Blue Jackets Cedar Rapids wins best-of-seven series 4 games to 0 Indiana Ice vs. Green Bay Gamblers Indiana wins best-of-seven series 4 games to 0 Omaha Lancers vs. Des Moines Buccaneers Des Moines wins best-of-seven series 4 games to 1 Tri-City Storm vs. Sioux City Musketeers Tri-City wins best-of-seven series 4 games to 3 Lincoln Stars vs. Sioux Falls Stampede Sioux Falls wins best-of-seven series 4 games to 0 Round-Robin Indiana advances as the top seed from the east with Waterloo as the second seed Round-Robin Des Moines advances as the top seed from the west with Sioux Falls as the second seed [4] [5] [6] [7] [8]