Rain already caused one weather delay at the 2013 U.S. Open, but Merion Golf Club is holding up well, including No. 11, despite the delay.
The 11th hole sits at the lowest elevation of the course, leading to some concern that Cobb's Creek, which borders the green, would flood. So far, that hasn't been the case.
Flooding hasn't been an issue yet, but there is still a lot of golf to play. If Cobb's Creek does overflow at some point this week, it could cause a major issue.
Matt Shaffer, Merion's director of golf-course operations, said the silt and grit left on the green from flooding makes the surface like concrete. That's if the hole is still playable. If No. 11 remains flooded, USGA Executive Director Mike Davis said players may be shuttled over to the West Course for alternate holes, though that's the ultimate doomsday scenario.