A creek in northern Tasmanian known to be home to the endangered giant freshwater crayfish has sustained "serious environmental harm" from land clearing and earthworks, the Environment Protection Agency has advised.

The crayfish is endemic to northern Tasmania and, along with a burrowing crayfish and a species of snail, was threatened by works conducted by Cement Australia at Eastern Creek and Caroline Creek near Railton last year.

In September last year, Tasmania's Environment Protection Authority (EPA) issued a stop work order to Cement Australia for land clearing and earthworks on land owned by a private forestry company a kilometre north of its Railton facility.

The order, an Environment Protection Notice, was published 13 months ago on the state government's land information system

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