Convention of Scottish Local Authorities transportation spokeswoman Alison Magee said the huge figure stemmed from decades of under-investment.
Addressing the first meeting of COSLA's transport members network, Ms Magee said the problem was aggravated by an imbalance in resources between central and local government.
'Scottish councils have responsibility for 93% of Scotland's roads but get only 60% of road maintenance spending, while the Scottish Executive, with just 7% of roads, gets 40% of that budget.
COSLA finance spokesman Craig Robertson said: 'This is yet another area where local government's role in delivering essential services to the public has to be recognised by the Scottish Executive when they make decisions on allocating the£3.4bn from the chancellor of the exchequer announced last month. We believe local government should receive at least£1.2bn over the next three years.'