The temporary bridge to replace Pooley Bridge near Penrith, which was washed away in December's floods, should be in place by Easter.
Cumbria County Council confirmed the plans while showing off the latest stage of the work.
A temporary metal structure is being moved into place, where the historic stone bridge used to be.
But just a few miles away, at Eamont Bridge, there's anger that the work there is moving too slowly. It appeared to start last week, but was halted almost immediately.
The Yanwath Gate Inn nearby says it's had to lay off five of its seven staff because the prolonged closure of Eamont Bridge means there are too few customers.
People trying to travel from one side of the bridge at the other have to undertake a diversion of several miles along narrow country roads.
In all 14 major bridges in Cumbria are still closed. They stretch right across the county, with six unable to be used in South Lakeland, four in Allerdale and four in Eden.