Police have closed the A592 closed from Windermere Marina to Newby Bridge due to flooding.
Vehicles are also stuck near the Hill of Oaks Caravan Site.
Motorists are being told to avoid the route.
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Wet and windy weather is causing widespread disruption across Cumbria and the south of Scotland, with more flooding expected today.
Sharon Grierson died in hospital from a lack of oxygen after a breathing tube was accidentally put into her oesophagus.
The boys, all aged under 16 and from west Cumbria, have been on trial at Carlisle Crown Court during the past fortnight.