Update: 7:04 p.m., Aug. 5
DriveBC reports that the multi-vehicle crash is clear at Porteau Cove Provincial Park.
"Expect delays to remain due to congestion," the post on X reads.
Fire Chief Rob Nicholls says that Britannia Beach Volunteer Fire Department (BBVFD) responded to the crash, with three vehicles and a dozen firefighters.
“BBVFD first responders extricated one person from a vehicle and provided medical care to several others, Nicholls said in an emailed statement.
RCMP and BC Emergency Health Services were also on scene, in stages, with multiple ambulances.
The most serious injury was transported by Air Ambulance to hospital.
Total, three people were transported to the hospital, according to Provincial Health Services Authority.
Meanwhile, DriveBC is also now reporting a landslide blocking Highway 99, 38 kilometres south of Lillooet, north of Duffey Lake.
"Crew and emergency services en route. Possible long closure: please consider using an alternate route," the post reads.
Update at 5:22 p.m., Aug. 5
A media spokesperson with the Provincial Health Services Authority says that three people were transported to the hospital due to this multi-vehicle crash at Porteau Cove.
These first responders were called to the crash at 4:27 p.m. today.
The spokesperson says that three BC Ambulance Service vehicles with paramedics were on the scene: two primary care ambulances and one advanced life-support ambulance.
An air ambulance was also at the crash.
DriveBC says on X that the exit ramp to Porteau Cove is currently closed, and highway lane closures are in place.
"Watch for crews and pass with caution. Expect major delays due to congestion."
—Original story at 5:02 p.m.—
DriveBC is reporting a vehicle incident affecting traffic on Highway 99 in both directions at Porteau Cove Provincial Park.
The accident happened at about 4 p.m. BC Day.
There is no word on number of vehicles involved or if there are any injuries.
Drivers heading to the area are asked to "drive with caution," and expect major delays.
Squamish News Buff, who is a local who monitors scanner traffic in the area and posts under the handle @SquamishAlerts, reports on X that firefighters and ambulances are on the scene.
Posters on Facebook's Sea to Sky Road Conditions report multiple ambulances and say the crash is right at the entrance to the provincial park.
Reports are that traffic is slowed northbound, but getting through. Southbound is said to be stopped.
The Squamish Chief has reached out to authorities for confirmations and more details. We will update this story if and when we hear back.