James Fraser, director of the Norfolk Yacht Agency, said the issue is affecting businesses like his, and putting people off keeping their boats in the Norfolk Broads.
He said some people have got stuck on the wrong side of the bridge and now have to pay to moor elsewhere.
The company organises boating trips along the coast or further afield to Holland and beyond, and recently had to cancel a planned trip to Southwold.
Fraser said: “For years now, we have been losing boats from the Broads. People are packing up because they are exasperated about having their plans ruined.”
He said the Royal Yachting Association estimates a moored boat is worth about £25,000 a year to the local economy.
