Mamquam South Mainline
Sea To Sky Natural Resource District
Distance
8.98 km
Last Road Report
Jul 01, 2026
Closures
No Posted Closures
Location
Mamquam South Mainline
Permit Holder
Northwest Squamish Forestry Ltd.
Waypoints
Distance
8.98 km
Avg. Gradient
0%
Ascent
0m
Descent
0m
Last Road Report
Jul 01, 2026
Closures
No Posted Closures
Location
Mamquam South Mainline
Permit Holder
Northwest Squamish Forestry Ltd.
Waypoints
Conditions
Start to 5.2 km
Somewhat Degraded
2d ago
5.2 to 6.5 km
Somewhat Degraded
286d ago
6.5 to 8.7 km
Impassable
305d ago
8.7 to 9.0 km
Somewhat Degraded
685d ago
Description
No description.
Road Bulletins
Road in good to 5 km shape, looks like they’re actively working.
Mamquam South Mainline in good condition for any car up to the junction with Emain, about km 26 (posted signs on road). No point in driving further if going up to the Dunkeld peak area.
Similar as the last post very overgrown and has a washout that is at the time currently passable and then the section of bridge with the sink hole.
Overgrown and rough from 5km to 6.3km. Sinkhole with wobbly tree logs at 6.3km. Might loose your car if you go further
Drivable for pretty much any vehicle to the bridge at 1.3 km, which requires a bit of clearance. Decent condition all the way to the E Main turn off.
Drivable snow. My car was stopped by the depth of snow ruts about 1km from E-100. Vehicles with higher clearance had driven up E-100 to around 1000m.
Decent condition up to the E-Main/E-100 turn off. Afterwards the road closes in and looks quite narrow
Driveable (4wd) with some potholes to turnoff between 3.5km and 4km. Past that it's still driveable for a few hundred metres with some mild pinstriping and rocky sections.
There is a washout at the 4.5km mark that will stop all vehicles except quads/bikes. There are two more washouts at 5km and 5.8km. Past around 5.8km alders will stop any off road vehicle.
There is a washout at the 4.5km mark that will stop all vehicles except quads/bikes. There are two more washouts at 5km and 5.8km. Past around 5.8km alders will stop any off road vehicle.
Road is drivable by a 4WD, SUVs or even 2WD up until the spur to Seed Peak. Only after this point is when it is heavy cross ditched and access is extremely difficult - as per earlier reports.
The road is for the adventurous. The start is a little overgrown but not much. There is one deep ditch passable in a short to medium wheel base 4x4. I did it in a stock 3rd gen 4runner. Then there is one half bridge, half logs and half dirt. After the just a few rough spots up to Dunkeld trail head.