Efforts are being made to repair or replace the pipe which discharges whey out into Douglas Bay.
It's hoped work can be completed before TT fortnight.
Water and Sewerage Authority Chairman Graham Cregeen MHK says they're trying to work out what's happened to the pipe:
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Road closures in place following incident in Hillberry area
Police response ongoing with Little Mill Road, Cronk-ny-Mona and Creg Ny Baa affected