Chasing a favorable forecast, hardy hiker spouse and I bit off the 6-hour drive from Issaquah to finally hike the boundary trail from Iron Gate through Horseshoe Basin to Cathedral Lakes. Due to the late season we lucked out and hit the peak of the wildflower season (and, unfortunately, the mosquito season too) along the hike. It's definitely worth the drive!
The drive mostly followed highway 97 up the westside of the Columbia and then along the Okanogan River. First time up there and we were amazed at the lush extent of the orchards! In Tonasket we turned left on 4th street, then left on highway 7 which turned into Loomis-Oroville Road. Passing through Loomis (don't blink!) we drove along a lovely reservoir and side valley, then turned left on Toats Coulie road which alternated (bumpy but patched) pavement and (washboardy) gravel several miles to a sign on the right for 'Iron Gate Trailhead'. Shortly after the sign, FR 500 cuts off - the infamous Iron Gate access road. It lives up to its reputation with a very narrow track, lots of rocks and deep runoff-ruts. Still, our passenger car was able to make it just fine going slow and aiming precisely to avoid getting high-centered. I would not want to do this with a low-clear car, but 4WD is not required (at least not during dry weather). After climbing steadily about 30 minutes on 500 we rounded a corner and there was the trailhead parking area, with three horse trailers and about 8 cars - UH OH!! Crowds? Horse piles? Still, we resolutely loaded up and set out at 2:05 PM on the trail which was clearly marked at the northwest corner of the parking area, along an old abandoned roadbed.
The trail started in lodgepole pine-fir forest and proceeded that way for about a mile, passing the junction to the Deer Lake and Windy Pass/Clutch Creek trail crossing, before passing into a very large burn which continued for nearly 5 miles almost to Sunny Pass. Skeleton trees but very vigorous regeneration of lodgepole and fir seedlings underneath, and lots of fireweed and lupine. The first 5 miles climbed gradually, then more aggressively, up successive steps first to a field of large picturesque white boulders and finally rounding a bend into the expanse of Sunny Pass with great views south and also north to Albert peak and Horseshow Basin meadows. A couple of lovely camps just before the pass. The junction for the Windy Pass loop (back to Iron Gate via Clutch Crk trail) cut off right at the top, though there was no sign for the pass. Continuing straight we arrived at Horseshoe Pass 2.5 hours and 6.4 miles later. Again no sign for Horseshoe Pass, just a sign for Goodenough Mountain trail going right. Meadow expanses in all directions and a very nice camp just up to the right of the junction, where we met some women who had come with horses and offered us some fresh cherries from their trees - thanks ladies!
Turning left there to continue on the boundary trail, we crossed a creek and more meadows and found Louden Lake on the flank of Rock Peak about a mile past Horseshoe Pass. Footpaths everywhere but no obvious camps - you really have to look! Someone had found a camp up above the lake to the right, and we wound around behind the lake on the left to find a couple of nice camps, choosing one to pitch our tent. Few good options to hang food, a consistent situation throughout this hike, as were the swarms of mosquitoes, but great views and I really enjoyed the evening sitting on the hill looking out over the lake.
The next morning we set out with Scheelite Pass as our objective. The trail rounds Rock Peak with views far north into Canada, descending slightly before passing around a small tarn and climbing up and south onto the shoulder of Haig Mountain. Once at the top the views really opened up to the south and west and we could see not only Windy Peak towering to the south but also Remmel Mountain and distant peaks of the North Cascades crest. The forest type throughout the high country was a fascinating and lovely mix of subalpine fir, lodgepole pine, whitebark pine, spruce (Englemann?) and lovely freshly-flushed subalpine larch, very open and interspersed with grassy meadows and white boulders as well as charred snags. The trail rounded Haig Mountain, descended and then climbed slightly traversing back into creek drainages and then back out around the shoulder of Teapot Dome (you only know you're there when you can look up and see the black-streaked dome above you). Some very nice camps heading up to and around TEapot Dome, with plenty of water throughout, at least this time of year.
From a high point on the side of Teapot Dome the trail descended to Scheelite Pass at about 18 miles from the trailhead, a broad flat spot covered in lodgepole pine with many very nice camps. Few if any good camps between Loudon and Teapot Dome though you might be able to find a small flat spot between rocks in the meadows if in dire need (but that would be poor 'leave no trace' practice!). We crossed water often along this section but not clear how many of the streams last through the dry season.
Because of the very flat trail we made excellent time to Scheelite, arriving there at about noon. AFter a snack we headed on with a plan to camp 3 miles further on, at Tungsten mine, where several other hikers said they had camped. The trail descended steeply from Scheelite (the steepest elevation change on the whole trip) and then continued to traverse with slight ups and downs around the south facing slopes until we came upon the Tungsten cabins, and slightly downhill from them, the junction with the Tungsten creek trail to Chewuch creek (8 miles down). We found a large, though swampy and buggy, camp just beore the cabins, checked out the mining debris and cabins (apparently maintained, just barely, by the boy scouts) and the outhouse with brand new hardwood toilet seats!
Our original plan had been to reduce our total mileage to and from Cathedral Lakes by making a loop out via Tungsten Creek, down to Basin Creek, and back up and out via Windy Pass and Clutch Creek trail. However, having checked out the depth of the drop to the valley bottom we decided to make a base camp at Tungsten, go out and back to Cathedral lakes with daypacks, and then retrace our steps along the boundary trail instead.
The third morning, we donned our daypacks for a short (40 minute) modest climb to Apex Pass (no camps along this section, though previous trip reports and indicated there were camps). Based on strong recommendations from other hikers we cut south up the ridge and made the easy climb to the top of Apex Peak for jaw-dropping 360-degree views including Glacier Peak to the southwest and Mount BAker-Shucksan to the west, plus the glory of the (still snowy) North Cascades. To make the climb, go just barely over the crest of Apex Pass and cut south across the open (boggy) meadows through the larch, aiming for the bouldery ridge to your right to avoid the cliffs. The high point had a small canister marking the spot.
Descending from the peak we headed on down from Apex Pass, around and back up, traversing to Cathedral Pass. Still a snowfield to cross multiple times as the trail switchbacked up to the pass, but mushy so safe with our poles. I would not want to have to cross it without poles.
From Cathedral Pass it would have been an easy scramble up to the top of Cathedral Peak but we decided to get a snack overlooking the lakes (barely melted below) and then head back so that we could get a ways back toward the Basin for our third night's camp. By then we had the idea that we could make great mileage on this gentle trail so hoped to be able to get out a day early. As expected we made it to Scheelite by about 3PM and took one of the nice camps there. We made a 6:20AM start the next morning and were able to make our way the 18 miles back to the car by 12:30PM.
Saw very few people, and the trail was extremely well maintained. Though this trail is obviously used by pack animals they did not have the extreme negative impacts of some heavily used pack trails and their impact was minimal overall. Our only suggestion would be that there be more formal camps established along the route to protect the meadows. Bring your 100% DEET!!