Crews broke ground this week to replace an almost century old water main along Main Street in downtown Missoula.
The work is scheduled to last almost six weeks, but Mountain Water Company officials say the work would take even longer if it weren't for a new technology they're using called pipe bursting.
Instead of digging a trench the entire length of Main Street, crews dig a hole at each end of a block and pull the new pipe through the old one.
Work started at Woody Avenue on Monday, and crews work their way down Main Street, a block a week, until they reach Madison Avenue.
Traffic will be pushed to one lane on the block crews are working on, and most businesses there will have to endure one day without water.
Mountain Water is holding a public meeting each Monday in the MSO Hub at 9:30 a.m. where officials will give an update on the work.