Follows road number 19 from Oberwald in the Rhone valley
and then deviates at Gletsch from this road
to take road number 6 up to the Grimselpass.
Until Gletsch there are a few moderately steep (5-7%) kilometers through the forests,
followed by a steeper passage (8-9%) of 1.5 km through a narrow part of the Rhone valley.
Gletsch is about halfway in terms of elevation meters,
with another 400 meter to go.
These take place on a treeless slope
and are done in seven hair pin turns.
The first few hundred meters after Gletsch (10%) are the steepest part of the climb.
The road is quite busy before Gletsch but calmer beyond.
The landscape is beautiful
but I have no opinion about the terminal part,
where I only saw fog.