There will be only one lane available in each direction on the Mercier Bridge this weekend.
This is the first of three consecutive weekends of work on the bridge.
As well as the lane closures two ramps will be closed for the weekend; the southbound off-ramp toward Chateauguay and the northbound on-ramp from La Prairie.
Detours will be in place.
The shut downs go into effect at 10 O’clock tonight and will remain until 5 Monday morning.