Lefthand Canyon is now closed to cyclists between U.S. 36 and Peak to Peak Highway until May 1 while crews remove major flood debris from the area and continue road re-construction.

The closure will be in place seven days a week, according to a news release from Boulder County.

"Due to unsafe conditions on the roadways such as steep drop-offs along the roadways from washed-away ditches and washed-away roadway shoulders, plus the increased volumes of heavy construction and road maintenance equipment along compromised roadways, so we can remove debris before spring runoff, we ask that cyclists stay out of the canyons if possible," said George Gerstle, Boulder County transportation director, in a statement. "While these conditions are experienced by both motorists and bicyclists, bicyclists are much more likely to have their safety compromised."

Residents who ride a bike for basic transportation purposes can call 303-441-3650 for a permit.

James Canyon remains closed to cyclists as well.

For more information about call the transportation department at 303-441-3900.

Contact Camera Staff Writer Mitchell Byars at 303-473-1329, byarsm@dailycamera.com or twitter.com/mitchellbyars.