Highlands and Islands MSP Donald Cameron has called on the Scottish Government to resolve the closure of the Dun Carloway broch.
Mr Cameron has acted as public concern continues to grow at the impact the prolonged closure is having on the island’s tourist industry.
In his message to tourism minister Fiona Hyslop, Mr Cameron said some coach tours were considering pulling out of the Western Isles because of the continued uncertainty.
He said: “The Broch, which is the direct responsibility of the Scottish Government through its agency Historic Environment Scotland, is a major part of the tourist offering on Lewis.
"Its prolonged closure, combined with a failure to adequately consult with local stakeholders, is causing consternation in the area.
“This follows a summer when ministers have failed to get to grips with a series of transport disruptions affecting ferries and flights to and from the Western Isles.
“I am very concerned that these continued problems could drain confidence from the business community and unsettle people who are considering investing in the islands.
"That would make it even harder for us to retain our young people here.
“Fiona Hyslop now needs to intervene and show that she understands the gravity of the situation.”
Councillor Ranald Fraser (Scottish Conservative - Uig and North Lochs ward) said: “The broch at Doune Carloway is one of our island's major landmarks and is vital for our islands tourism and general economy.
“In my view it is ridiculous for Historic Scotland to have closed this monument without there being any precise information on the nature of the problem or any timescale given to rectify.
“What is the problem? We have not been told. I strongly request Historic Scotland to start communicating with the local estate trust to resolve this matter urgently.”
Photograph: Donald Cameron MSP (left) with Councillor Ranald Fraser