Ms Hulme warned: "Extreme events in the Gorge where the land slips into the River Severn are not theoretical, they are real, having happened twice in the past 60 years.
"The ground monitoring undertaken in this area is disturbing, showing constant movement, most recently over the winter.”
Significant landslides have been recorded around Salthouse Road since the 1880s.
In 1952, six houses were lost, around 300,000 tonnes of ground moved and the river reduced from 38.1m wide to 24.4m and in 1983 Salthouse Road was swept into the river.
The latest stabilisation project is expected to take two years.
Ground monitoring in Jackfield near the Ironbridge Gorge site in Shropshire, has unearthed "disturbing" findings of constant land movement towards the river as recently as last winter.
An action plan was revealed between Telford and Wrekin and Shropshire councils to stabilise an area covering 7.6 acres of the historic site.
The report reveals for the first time the extent of the work necessary – and the consequences of doing nothing.
Some stabilisation work has already taken place in the area but the report's author says more action is necessary.
Planning officer Valerie Hulme warned the river gorge, visited by hundreds of thousands of tourists every year, could be blocked by a landslide, causing flooding.
The extensive measures are deemed "vital" for the long term survival of residents, business and tourism in the area.
A total of 350 metres along the river at Salthouse Road, rising 250 metres into Jackfield, will be underpinned and roads and footpaths realigned.
A new road, car park and river viewing areas would also be created by the plan, which is recommended to get the go-ahead by planners next week.
Around £12million will be ploughed into stabilising the world-famous Ironbridge Gorge in Shropshire as ground reports suggest the attraction is a risk of landslides.
Telford and Wrekin and Shropshire councils have drawn up an action plan to stabilise 7.6 acres of the historic site.
Some stabilisation work has already taken place but planning officer Valerie Hulme, who reported on ground monitoring work in the area, argued that more action was "absolutely necessary"
A total of 350 metres of land along the river at Salthouse Road, rising 250 metres into Jackfield, will be underpinned and roads and footpaths realigned as part of the works.