From the Daily Camera
"The damage has been so significant that our commuting and recreational patterns have been changed dramatically, and we ask that the community be patient as we work to restore access and infrastructure over the next months and years," George Gerstle, Boulder County transportation director, said in a news release.
Also rumor has it that temporary road structures will be setup by the army corp of engineers just to make the routes useable but questionable if recreational usage will be allowed until the permanent structure can be put in place
Hope For Mountain Bikers
From a good source word is Rabbit Mountain will be the first Open Space MTB trail to open in the Boulder area and some other light trails have already opened. See Boulder County announcement