The Mount Vernon Trail was clear except for the two overpasses by the airport. It was quite a challenge to ride over the ice/snow without falling--my first time on ice. I thought the 14th Street Bridge would be better from the salt spreaders on the bridge, but it was pretty well coated with ice. There was a six inch clear single track that allowed safe passage, though.
My normal route through the Capitol grounds was closed in preparation for the State of the Union address, so I had to make a short detour.