work zone sign

​​​​​​Below is information regarding lane closures and detours impacting the City of Thornton.

Quebec Street Closure

Quebec Street will be closed between 120th Avenue and Riverdale Road from 2/6/2018 through mid October 2018. 

The detour route for northbound traffic is northeast on Riverdale Road to 128th Avenue, then west on 128th Avenue to Quebec Street; or southeast on Riverdale Road to 112th Avenue, west on 112th Avenue to Holly Street, north on Holly Street to 120th Avenue, then east on 120th Avenue to Quebec Street.

The detour route for southbound traffic is west on 120th Avenue to Holly Street, south on Holly Street to 112th Avenue, then east on 112th to Riverdale Road; or east on 120th Avenue to Brighton Road, south on Brighton Road to 104th Avenue, west on 104th Avenue to McKay Road, then north on McKay Road to Riverdale Road.

The closure is for reconstruction of Quebec Street between 120th Avenue and Riverdale Road as part of the Mayfield subdivision project on the southwest corner of 120th Avenue and Quebec Street.

Holly Street Closures

Holly Street between 112th Avenue and 119th Avenue, 119th Avenue between Holly Street and Jasmine Street, and 112th Avenue between Holly Street and Riverdale Road will have periodic lane closures.

These closure are part of the Xcel Substation project. More information on construction updates and schedule for the Xcel Substation project can be found at To submit questions and provide feedback, call the project hotline at 844-551-6281 or email the project team at

Lafayette Street Closure

Lafayette Street between 128th Avenue and 126th Avenue will be closed from 9/5/2018 to 9/15/2018.

The detour route for eastbound 128th Avenue traffic is to go east on 128th Avenue to Claude Court, then south on Claude Court to Eastlake Avenue, then west on Eastlake Avenue to Lafayette Street.

The detour route for westbound 128th Avenue traffic is to go west on 128th Avenue to Washington Street, then south on Washington Street to 126th Avenue, then east on 126th Avenue to Lafayette Street.

The detour route for northbound Lafayette Street is to go west on 126th Avenue to Washington Street, then north on Washington Street to 128th Avenue, then east on 128th Avenue to Lafayette Street.

This closure is part of the 128th Avenue Waterline Rehabilitation Project. 

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