"I didn't look at a leaderboard," Webb said. "I just wanted to get into position. That is my usual plan over the first two rounds. "The difference today was that I didn't make as many putts as I did in the first round."
Webb managed just one birdie in her outward 35 but missed another chance when she had three putts at the 264-yard ninth after driving the green.
Three more putts cost Webb her first bogey of the championship at the short 13th, but she had a birdie at the 11th then hit a four-iron to three feet for a two at the short 15th.
Johnson, out in 35, dropped a shot at the 10th, where she drove into sand, but had birdies at the next two. Another birdie, at the 15th, saw her move to within two strokes of Webb, only to fall back with a bogey at the 16th.
"My putter was a bit cold today," Johnson said. "I had 33 putts but it felt like 43."
Nancy Lopez slipped as she was leaving the 10th tee and hurt her arm. The American, runner-up to Alison Nicholas in the US Open last month, had a 79 to finish on 156, missing the cut.Reuse content