I hiked to the Northwest summit of Grassy Top which is right above the Hall-Grassy junction at the 2.7 mile point. 
The summit requires some bushwhacking the final 300’ gained in about .25 of a mile after leaving the trail but in mostly open forest with huckleberry understory which later give way to meadows. The best approach is to walk for a few hundred yards toward Hall Mtn until reaching a small meadow on the southwest side of the NW Grassy Top summit and walk through forest for a short distance to more open meadows. I had not studied satellite images sufficiently and took a more direct route from the southeast. Though shorter, this route required more bushwhacking and I only noticed the better approach after the fact. 
The trail has been logged out from Pass Creek Pass and is in good condition other than a few minor brushy areas. The PNTA trail crew has been hard at work on this section and it shows. 

Road report only, didn't hike. Spoke to a ranger on Friday 6/3 and she said that crews had been up that way and said driving up to Pass Creek Pass isn't possible. It should be impassable starting a few miles before the pass. At the "turkey foot" in the road, the snow begins.

Beautiful hike with lots of huckleberries to pick along the way and lots of wildflowers. Gorgeous day for views with puffy white clouds!

The GPS coordinates for the trail head on this website are wrong, the actual coordinates are 48.798204, -117.134023 .

Grassy Mountain is a difficult trail, but the 360 degree views at the top are worth it!  Trail is "difficult" because it's 4 miles uphill, 2200 ft elevation, with the last two uphills steep and with loose rocks.  Trail was dusty in sections, both in forested areas and exposed in some.  Views from the top offered St. Maries, Idaho to the south; and the "chain" lakes to the north.  The chain lakes are on both sides of the Coeur d'Alene River and include Killarny Lake, Black Lake, Swan Lake, etc.  

Trailhead - I-90 to exit 34, Rose Lake/Harrison; 18 miles on ID3, left on Rosemont drive to the end of the road.  Park on side of the road.  

I first hiked a variation on this loop about ten years ago and thought it was about time to return.  Last time I made Gypsy Meadows my start & end point, but this time I decided to make the drive even easier by using lower trailheads.  We went in via the Halliday Trail, accessible less than 1 mile off the pavement on Highway 31, and we finished at the north end of Sullivan Lake, adjacent to a developed campground and therefore on the pavement.  We had a shuttle car, so we were able to skip the road-walk section.  If you don't have a shuttle car, use Red Bluff instead of Halliday and add about 1.5 miles on the road at the end (Sullivan Campground to the Red Bluff TH on the Sullivan Lake Road), and it's basically the same loop.

We started Saturday morning, hiking in on the Halliday Trail.  I have never hiked the entirety of this trail before, so this part was new to me.  The bugs were pretty fierce here, as the trail crosses the Halliday Fen where there's a lot of standing water.  Aside from the mosquitoes, the trail was delightful: pretty forest, several good viewpoints, and a moderate climb.

We met the PNTA crew working on the North Fork Sullivan Creek re-route around the former bridge site, and they have the new trail segment entirely roughed in at this point.  The trail beyond the re-route hasn't been maintained during the trail closure, so once we crossed into the Salmo Priest Wilderness (about 1 mile past the re-route) and started the big climb up to Crowell Ridge, we were frequently having to climb over and under downed trees.  We filled up on water at the last stream before gaining Crowell Ridge, then camped at the dry campsite at the North Fork/Crowell Ridge intersection on Saturday night.  This allowed for exploration of the old Crowell Ridge fire lookout & provided excellent sunset/sunrise views.  This was a tough day with nearly 5,000' elevation gain.

On Sunday we continued out Crowell Ridge to Bear Pasture, stopping a few times to enjoy the views and make a few snow angels.  We were trying to pick out Canadian National Parks across the border (we think we saw three), looking at Gypsy Peak in the foreground, and then looking across to our night's destination on the Shedroof Divide.  The Idaho Selkirks were visible on the horizon.  

Once at Bear Pasture, we descended via Leola Creek.  It's a former trail and roadbed, now choked with alder.  There's no good hiker access down, so we battled our way through.  This is definitely not a beginner-friendly route.

At the bottom, we hiked up the Shedroof Cut-off trail to intersect the Shedroof Divide, and then had to hike longer than we would have liked to get to a decent campsite for the night.  The campsites are few and far between on this route, so this ended up being a theme for our group.  It would be easier with a smaller group, but we needed room for five.

On Monday morning I was awoken far too early by a bear checking me out as I slept!  The others were in tents, but I was sleeping on the ground and must have looked very interesting to the passing bear.  It promptly ran away when I woke up, thank goodness!  Just a curious bear, and my food was several hundred feet away & safely up a tree, so it all turned out well.

We hiked out the Shedroof Divide to Pass Creek Pass, then crossed the road to continue toward Grassy Top.  We turned off on the Hall/Grassy Divide and were hoping for a campsite with water near a stream indicated on the USGS map.  We found neither, and ended up hiking all the way to Noisy Creek before we found a place with room for five backpackers.  This made for a very long day on Monday!

Tuesday was easy: finish out Noisy Creek, then hike the Sullivan Lakeshore trail to our waiting shuttle car.  We were keeping a close eye on the time since we knew Cathy's Cafe in Metaline Falls would be closing at 2pm, and we made it with plenty of time to spare (which also allowed for a quick dip in Sullivan Lake).  Good food & milkshakes to-go!

This full loop is roughly 55-60 miles in total length, with nearly 10,000' elevation gain.  It's tough!  But it's also about the best grand tour of the northeast corner, so well worth the effort.