A day later, the number rose.
"I'm 120 percent committed," the Miami Monsignor Pace High running back said with a chuckle on Monday night.
"Right now, I'm committed to Iowa and that's what I'm looking forward to," Johnson said. "I'm not visiting Minnesota."
Scout.com rates Johnson as a two-star recruit on its five-star scale. The 5-foot-8, 210-pound back rushed for 1,100 yards rushing with 10 scores as a junior. He'll miss this season, his senior year, after tearing his ACL.
Johnson said he can bench 315-pounds, squat 410 and get 39-inches on his vertical jump. He claimed a 3.5 core GPA and a 920 on the SAT.
Johnson called the Iowa coaches on Sunday to tell them he wanted to be a Hawkeye.
"I called them after their practice," he said. "I talked with Coach (Rick) Kaczenski and I told him. He was happy. He ran downstairs to the other coaches to tell them."
Johnson took his official visit to Iowa City the weekend of Sept. 18. Before coming to town, he said he might commit on the spot. After his trip, he said he wanted to hold off, despite really liking everything he saw on the visit.
"I really wanted to get home and sit down with my family and talk about it," Johnson said. "We just looked at it. We researched a little bit. We talked about how I could deal with being away from my family and stuff like that. We looked at the academics and it felt like the best place for me."
Johnson visited Iowa on the same week Fort Lauderdale running back James White took his official. They were told by the Iowa coaches that the program would be taking just one more at their position in this class having already secured a commitment from Marcus Coker.
Johnson said that news did not factor into his decision.
"Not at all," he said. "I just felt like the time was right for me. I wasn't really thinking about losing the scholarship offer. I was just doing my research on all the schools that I had offers from, looked at the rosters and decided this was the place for me. This is the type of offense I like. I hope to have a big effect on their program."
A Miami surgeon will repair Johnson's ACL on Oct. 7.
"Two weeks after surgery I'll be able to walk without crutches," he said. "In three months, I'll be able to run, but no cutting. In about eight months, I should be ready for football."
Johnson hopes to get to Iowa City early next summer to work with trainers and learn the Hawkeye system.
"I'm just going to go up there and give it all I've got and compete for a spot," he said. "I'll only be a true freshman, so whatever it takes I'm willing to do."
Johnson said that he's leaning toward majoring in business at Iowa.