Cleator Moor Road is also closed this week at the Whitehaven end: Cumbria County Council will be carrying out resurfacing at a cost of £185,000, along a mile-long stretch of the B5295.
Copeland Pool and Fitness Centre, which is on Cleator Moor Road, said it will remain open but asked users to set off early in case of tailbacks.
Around 500 people a week use the pool for lessons and general sessions. The school summer holidays are one of their busiest times.
Cumbria County Council's Cabinet member for Highways, said the resurfacing works had been timed to take place during the summer holiday period to minimise disruption.