ROADWORKS MAP: Year of disruption looms on Burnley roads
The project, which has already begun, will affect main routes into the town centre, along Westway and Trafalgar Street, part of Manchester Road, Finsley Gate and Parliament Street.
Contractors will replace 18 miles of old metal pipes with new plastic ones.
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Hide AdOther roads affected by work include Barden Lane, Holden Road, Padiham Road, Brunshaw Road, Kiddrow Lane, Cardigan Avenue, Sycamore Avenue and Waddington Avenue.
Bosses at the utilities company said they will try to keep disruption to motorists to a minimum and work with businesses to keep routes open.