I wouldn't count on it being open for rush hour, but you never know. WSSC says that repairs to the 8500 block of River Road in Bethesda, MD are nearly finished. They replaced 80 feet of pipe and even after the road opens they will still be working in the area so they will have flagmen that may temporarily stop traffic.
River road has been closed for 9 days by this water main break. This is a pretty important commuter road so I am glad it happened around Christmas when many people are taking days off. I found a video of the reconstruction that was taken on Christmas Eve.
[where: Bethesda, MD]
[where: Montgomery County, MD]