The Lancaster Canal has seen the most bridge strikes across the whole of the Canal and River Trust's 2,000 miles of waterways in England and Wales, the charity has said.
Over the last two years it has paid out more than £500,000 to repair more than 10 bridges - many of which are Grade II Listed - which cross the 41-mile long canal.
One of the bridges - the humpback Stone Chimney Bridge near Preston - has been hit by a vehicle 11 times in five years.
The trust has appealed for motorists to take more care when driving on rural, narrow roads in Lancashire.
The most recent Stone Chimney Bridge crash happened just weeks after repairs had been completed and the bridge reopened following an earlier lorry strike.
Bill Froggatt, heritage advisor with the Canal and River Trust, said: "Humpback bridges such as these are an iconic part of Britain's canal network.
"This latest strike on Stone Chimney Bridge has caused significant structural damage to the masonry, which will once again require vital conservation and repair work.
"All these bridges are part of the canal's special character and heritage, and each time one is hit a small piece of history is lost."
The Canal and River Trust looks after about 2,800 historic canal bridges in England and Wales.
Most were built in the 18th and 19th Centuries, long before the advent of modern vehicles, making them vulnerable to strikes by wide or speeding traffic.
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