Communities bypassed following the building of three bridges continue to suffer more than 20 years after the structures opened, it has been claimed.
Reay Clarke, who suggested bridging the Moray, Cromarty and Dornoch firths in the 1960s, said more had to be done to help towns and villages to recover.
The farmer and Highlands MSP Jamie Stone said central Sutherland was the area hardest hit.
The pair were interviewed for BBC Radio Scotland's No Going Back series.
AFFECTED COMMUNITIES
He said: "Dingwall lost its status.
"With the regionalisation of local government Dingwall lost the headquarters of Ross and Cromarty County Council which was a big blow to it and everything now has moved to Glen Urquhart Road in Inverness.
"One or two communities really have pulled through. Beauly seems to have a bit of a buzz about it.
"The two hit in a really bad way are Bonar Bridge and Ardgay. Shops have closed, people have moved out, there are no new houses being built.
"If you drive through you get a sense of deterioration and lack of growth."
Mr Clarke added: "Though they spent a huge amount of money on the bridges, very little was spent trying to help the bypassed communities."
Mr Stone said efforts had to be made to encourage tourism to the affected communities.
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