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The Tamar barge can be either a single and double masted vessel. It can carry up to 32 tonnes. Tamar barges were manufactured in the 19th Century in the Tamar Valley by boatbuilders such as James Goss of Calstock and Frederick Hawke of Stonehouse, Plymouth.
There are only two surviving Tamar barges, both have been almost completely restored. Normally one, Shamrock, is open to visitors at Cotehele Quay and the other, Lynher, is privately owned and moored at Cremyll.
Shamrock is currently under going extensive repairs due to lack of maintenance which had led to mould and rot spreading throughout the timbers. The National Trust has launched a fundraising campaign to pay for the repairs to the historic vessel.