Following heavy rain and high river flows, additional protection will be added at Laxey River.
The Department of Infrastructure says more large rocks will be placed on the existing protection area to help protect banks and walls.
Work is expected to continue until Wednesday December 8, weather permitting, and will be undertaken from the roadside.
An emergency 'no parking order' is in place on a short stretch of Glen Road and is marked by cones.
TT food van needed for trackside car park
Northern roadworks to hinge on Mountain Road reopening
Beer festival to return this week
Dublin to sign friendship agreement with Douglas in summer
Total of 35 properties on council's dilapidated list
Equipment being sold off from popular former bar
Council to object to Summerland site plans
Manx Care still trying to contact dental practice