B.C.'s Highway 12 is re-opened between Lillooet and Lytton after transportation crews blew up a massive boulder that tumbled into the middle of the road.

In a video posted by the Ministry of Transportation, you can hear a countdown before the charge was detonated.

"Oh, that was good!" yelled a crew member after the boulder crumbled into small rocks.

Officials with the Ministry of Transportation said the boulder landed on the road near the seven mile marker, about 10 kilometres north of Lytton on Sunday.

A geotechnical engineer assessed the situation on Monday morning.

Lytton Mayor Jessoa Lightfoot says she's seen plenty of rock slides in the area, but says it's unusual for a large boulder to fall without more debris and that might be why the route has been shut down.

"I think the one lane is clear, but I imagine the scare of additional falling debris is keeping it closed," she said on Monday morning.

The closure affected many people who commute between Lillooet and Lytton for work and school, said Lightfoot.

"There will be a number of people on school buses today that won't be able to get into town, to get into work. Hopefully they'll be able to clear it by the end of the day."

Earlier this month a crash in the area on Highway 99 north of Lillooet killed two people and injured three others, leading to calls for improvements on the route.

Drivers can check DriveBC for updates.

Google Maps: Highway 12, B.C.

Instagram: B.C. Ministry of Transportation