spending a week in squamish in august. other than the grand wall, what are some 4-8 pitch 5.9-5.12 multipitch ultraclassics I need to do while I'm there? If its a 5.12 preferably only one pitch in that grade as I can't climb 4 .12 pitches in a row.

Freeway!

Grand Wall
Freeway
Alaska Highway

Not perhaps as hard as you might like, but I enjoyed these.

Rock On (10a 6 pitches) to Squamish Buttress (10c). Squamish buttress has one good pitch the rest is just ok.

Ultimate Everything (5.9) is a great moderate way to go bottom to top.

Angels Crest (10.c 14 pitches) feels pretty alpine but was my favorite climb of the trip.

Sunblessed is a great rest day 3 pitch 10 ish route way up on the backside of the Chief. Dont skip the last pitch flare!

Enjoy!

Calculus Crack 5.9

The Snake on the Apron is a 5 pitch 9 that I thought was super fun. Snake

Two newer possibilities:

Milk Road on Chief 9p 10d A0

Right Wing on Slhanay (Squaw) 6p 10c

Topos, etc here:

jeremyfrimer.com/Climbing_Routes.html

I very, very highly recommend both Borderline and Blazing Saddles.

Supposedly there is a way to link Borderline into Angel's Crest (via dirty ledges?), which you could then link into High Plains Drifter, which would be a helluva day.

If you're really game for 5.12, Daily Planet looks sweet.

Angels Crest is really cool! It starts with a tree climb! You can end it with High Plains Drifter which is spectacular; solid 5.11 but only 2 pitches.

cruel shoes > grand wall

stairway to heaven

I hear the grand wall is choss

Millenium Falcon (5.11)! I've also climbed Squamish Buttress, Angels' Crest, Europa, Sunblessed, Calculus Crack, and for long, multipitch routes, Millenium Falcon was my favorite.
Sunblessed has a terrific crack pitch, but has only three pitches.

The new guidebook has a Top 100 list, and this is a good place to start. Some of the routes mentioned above are great choices, while others .... not so much.

Consider the following:

Centrefold
Angel's Crest
Grub Street Complex
Great Game
Cruel Shoes
Milk Road
Right Wing
Grand Wall
Freeway