Bertha is a steam-powered boat built in 1844 to remove silt from the Port of Bridgwater in Somerset, England.

[3] The boat was built, of riveted iron,[4] in Bristol by Lunnel, G & Co copying a design, by John McLean,[5] developed by Isambard Kingdom Brunel to deal with silt in the Floating Harbour.

[2] It is a bed leveler or plough dredger, with a large metal blade, which could be lowered at the stern of the boat, below the water similar to a bulldozer on land.

[7] She was then taken to the Exeter Maritime Museum, where she was shown working with the help of John Selby (welder and fabricator in Spaxton, Somerset).

The Eyemouth Maritime Museum closed and Bertha is now in Bristol, but not on public display.