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Try using the search function on this forum. Lots of good information is available if you are willing to put some effort into it. You are not the first person looking for this info.
Grouse numbers in my area have been dismal for years, might be the same where you are hunting also!
Here is what I recommend: Drive over Chinook Pass ,SR 410, down to Morse Creek and drive over the bridge,take the first left(forest rd 462)drive to the old mining area at the end of the road. Climb up into the thick brush and hit the old cat tracks and trails up to the Norse Peaks Wilderness and you will surely find the grouse. You should have a open choke or modified and be quick on the shot as they will flush wildly even with a dog. If you are a tough and a young guy you can climb up to the ridge and get into the Norse Peak Wilderness as there are plenty of grouse up there,too and not so heavy cover. Bring water and don't expect to see anyone as I have never ran into anyone up there. I seen so many big bucks one time that I wondered who hunts them as they didn't seem concerned with my closeness and I had a dog with me, too. I also picked many low bush huckleberry's up on the meadows and mushrooms close to the road. There are great sights and vista's to enjoy as you enjoy a lunch break such as Fife Peak, M.Rainer,Adams and even M.St.Helens if you climb high enough.
I suggest you buy a map of the MT. Baker/Snoqualmie National Forest and a copy of the WA Atlas & Gazetteer. By doing some exploring with those tools, you will find grouse. I would look in the Skagit county areas for a day hunt.
This is all great information! But a wise ole man gave me advise once on grouse....."Grouse are not where they are suppose to be, grouse are where you find them".....that ole man was right more than once, thanks dad........ The problem with this time of year is, there's food everywhere! Everything's ripe! Grasshoppers are plenty! Food sources are tough, but water and grit are a must.