The Cockermouth site, which is now part of Marstonís, was 10 feet deep in water at one point and has no power.
But the company says there is enough stock in the supply chain to ensure brands like Cumberland Ale, Sneck Lifter and Cocker Hoop are available to trade customers throughout the disruption. But it is not yet clear when Jennings will be able to resume brewing.
Marstonís Beer Company managing director Steven Oliver said the business would play an active role in the townís clean-up work following the unprecedented weather. More than a foot of rain fell in the area within the space of 24 hours.