Gwyn leads the party to about the right spot of the Serpent Gorge, she thinks, and Elissa does not have major corrections, but by it's getting late so you camp for the night under the cover of old forest near the gorge, assigning the guard duty just like the yesternight. Nothing untoward happens during the night, except for the drizzle, which continued up to about the midnight. The morning seems marginally less cloudy than the morning before, which is a good sign, but the morning air is still humid, with even some mist down below. Consequently, the ground is mostly as wet as it was in the evening, maybe a bit less so.
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Mark one other day's worth of supplies as consumed.
If you go down the gorge right now, it's DC 8 Climbing OR Acrobatics, rolled thrice per person, to reach the bottom. Those trained in either can take 10. It might get better by noon (Survival 10 for an informed guess). You can help one another the usual way if you tie yourselves with a rope in whatever arrangement, but if a fail's still a fail after all of the help, all those tied together will suffer the consequences.