The A5086 partially blocked due to flooding between A595 / Howbank Road (Egremont) and A66 (Cockermouth Roundabout, Cockermouth).
Motorists are being advised to approach the road with care.
There are various stretches of the road affected as well as a number of minor routes through Frizington, Wath Brow, and Cleator Moor.
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LHG Live, organiser of the upcoming Olly Murs concert, says it's re-examining all security measures and making adjustments.
The project begins in July, to repair the main route to the West Cumberland Hospital.
Here's a list of road closures and speed restrictions that will be in place over the event.