/ Corvus then Cams Crag ridge
I something like this in the Spring, although we descended to Cam Crags, we weren't aware of the ridge so just came down a gully. It may add several extra miles, but they are for the most part in Langstrath, so that's no bad thing. Was dry when we did it, but I wouldn't have though Corvus would be much harder in the wet. There were a lot of new fences about up there, but the way was pretty well trod and I think there were styles from memory. Good day out we thought.
If the forecast is right then you'll probably want to descend as soon as you possibly can!
I think that you'd be better off ascending Cam Crag Ridge and then dropping down Combe Door in to the start of Corvus.
You can pretty much contour around, to the top of Cam Crag, once you've finished Corvus... I take it that you are aware that Cam Crag ridge is Grade 1 scrambling? Depending on the route that you take, it also has a few moves of Grade 2 thrown in there, too. You'll need to be careful descending it if it's wet. That said, it's usually possible to skirt the scrambling if necessary.
This site has some good photos of what to expect if you decide to descend alongside Combe Gill from Combe Door, to the start of Corvus, rather than tackle Cam Crag Ridge in descent:
From what I can remember the ground between the top of Corvus and the top of Cam Crag Ridge can be fairly heavy going, boggy in quite a lot of places with little in the way of distinct tracks. I went up Cam Crag Ridge and descended in to Combe Ghyll one dryish summer and still had difficulty finding a way that was dry underfoot.
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