My nephew Peter (the mid-western mountain goat) and I did a 3-day hike up to Whatcom Pass and back.
8/24/07 After picking up our backcountry camping permit at the Glacier station, we left the Hannegan camp trailhead at 10:40 a.m. The hike up to Hannegan pass was straightforward, though the last part is pretty steep. We arrived in time for a nice, long lunch in the shade at 1 p.m.
We took our time on the descent to Boundary Camp, Copper, and arrived at U.S. Camp around 5 p.m. The afternoon sun was wonderful filtering through the trees. The camp was empty when we arrived, and we had the best tent site we've had in all our years of backpacking - flat, solid, sandy soil, slightly elevated above the surrounding ground, with a nice protective covering of branches of old growth trees above us.
The next morning we slept in. After breakfast when we hit the trail with a single light pack, it was already 9:40. Crossing the Chilliwack via cable car (what fun!) left the Chilliwack River trail and began to ascend the Brush Creek trail, hiking past Graybeal camp and up towards Whatcom Pass. Although the Green Trails map lists a camp at Tapto Creek, we never found it, but instead ate lunch along the banks of the Tapto, and watched the clouds move rapidly from west to east along the ridge on the other side of Brush Creek. Although there were occasional showers, the hiking was very pleasant.
Arriving at Whatcom Pass just before 3pm (the trail turned steep after Graybeal camp), we spent a pleasant hour on the knoll just south of the pass. We contemplated a jaunt up to the Tapto Lakes, but the way (and presumably the lakes) were completely socked in by clouds. We had an occasional glimpse of the Challenger Glacier, but the peak itself, and Whatcom peak were obscured by clouds. The way east towards Camp Stillwell and Beaver pass were clear and glorious though, and we could easily make out peaks on the far side of Ross Lake.
Returning down to U.S. Camp, the rain picked up in intensity, particularly after Graybeal, and was pretty much steady through the night. Our tent held up well - soaked on the outside and bone-dry inside!
When we broke camp on 8/26, it was clear that our tent site was perfect. No water had seeped under our tent. Hiking out, we had rain on and off on the way to Hannegan Pass and then hard rain non-stop from the pass to the trailhead.
Let me briefly praise the folks who maintain these trails - we met a Job Corps crew actively maintaining the Brush Creek trail. They have done a super job. The trails are in splendid shape, and with one very brief exception, clear of brush all the way to the pass. Even in the rain, the trails held up extremely well.
This is a wonderful route, with a fair amount of vertical. If I were to do it again, I'd ask for one more day, so we could camp at the Tapto Lakes, and for better weather, so we could see all of the peaks.