El Capitan Cave

I’ve been hearing about El Capitan Passage from various friends in town so I bugged Jim to include it in our plans.  Located on the northwest side of Prince of Wales Island, this passage is a protected short cut for fishing boats and other commercial traffic, ending up in Sea Otter Sound at the southern end.  Near the northern entrance is a large marble mine, still active.  el cap passage map

A segment of the passage at the north end was dredged through rock, well-marked with navigational aids, but narrow and just a little bit exciting to navigate through, particularly at dead low tide.  Why is it that we always seem to be in “interesting” rocky passages at low tide?20150610 6329 el capitan passage dredged channel r20150611 6391 el capitan pass granite dome rWe anchored in one of the little bay-lets between dredged sections called Dry Strait anchorage, and the view was very interesting – there were a lot of granite domes like this one – rather different terrain than on some of the other islands in the Alexander Archipelago that make up Southeast Alaska.

We didn’t realize that there are a lot of karst formations – limestone caves in the area, and that the Forest Service offers tours of the largest one, El Capitan Cave in the summer months.  We called the Forest Service on the sat phone and made arrangements for a tour – what an unexpected bonus!

We launched the dinghy and traveled about 2 miles to the Forest Service dinghy dock where we met up with our excellent guides – a pair of geology undergraduate students.  Everyone was given a helmet and headlamp, and Matt and Anna gave a running narration about the forest and area as we trudged up the 370 steps, climbing 1100 feet in elevation to the entrance to the cave.  The steps themselves were interesting: built from yellow cedar 20 years ago, they have survived extremely well in the thick rainforest with virtually no rot.

20150611 6335 el capitan cave sign rDiscovered in the 1980s, the El Capitan Cave is the largest (so far) cave in Alaska, with over 2 miles of passages that have been mapped.  Animal remains, including black and brown bears have been found in the cave, some dating back to over 11,000 years ago.  I thought it was interesting when one of the geologists pointed out that this cave is karst – limestone dissolved by water; limestone is calcium carbonate.  Marble is quarried nearby and it’s also calcium carbonate, but formed under different temperature and pressure than limestone.  The north end of Prince of Wales Island is dotted with karst formations.

20150611 6338 exploring el capitan cave rThe helmets turned out to be a necessity, as I whacked my head on the ceiling not far into the cave’s entrance.  (I whacked my head in the exact same spot on the way out.)  This is a “wild” cave, in its natural state and not “enhanced” by paved walkways or hand railings.  Part of the main passage was clearly a streambed, but the walls had all manner of flowstone formations, dragon scales, nodules, crystallized seams, and water droplets that seeped down from the muskeg over a long period of time.20150611 6361 el capitan cave flow stone r20150611 6360 jim in cave with flow stone samples r20150611 6337 el capitan flow stone rThis is a cross-section of some flowstone from the cave that was cut and polished to show what it looks like inside.

What’s fascinating about this cave and the numerous others in the area are that they were only just discovered in the last 30 years or less, yet so many of them contain animal bones that are 8,000-12,000 years old, and in some cases the bones are from animals that are no longer found on Prince of Wales Island.

We were expecting rocks, mountains and sea otters, but not caves and paleontology – what a great surprise!20150611 6385 jim at el capitan cave sign r

Summer Cruise – First Stop

After spending a little time with friends in Petersburg and one last ride Out the Road (where we saw a number of porcupines, deer, and a grouse hen with her chicks), we cast off the lines for the summer’s cruising.  Our first stop was the little community of Point Baker, located at the very top of Prince of Wales Island. petersburg to point baker mapDid you know that Prince of Wales Island is the 3rd largest island in the United States?  Do you know what #1 and #2 are?  (#1 is Hawaii’s Big Island, and #2 is Kodiak.)  As large as Prince of Wales (or POW, for short) is, the settlement at Point Baker is tiny – about 25 residents.20150609 6297 point baker inlet rThe community is a scattering of houses perched on the craggy shores of POW and on some islands separated by narrow rocky channels.  We were hoping to see a friend from Petersburg who was fishing in the area, but he did so well fishing the day before that he had left already.  The locals didn’t have much to say to us, though they would answer questions if we asked.  I guess people who want to live in an outpost community aren’t very sociable.

The state dock was mostly full of scruffy boats and borderline derelicts, and there was a tiny store, bar, and cafe on a float right next to it.  The store is open from 12-2 most days, and it primarily stocked beer, soda, and chips, along with a few other necessities.  The bar didn’t seem to be open, and the cafe wasn’t open yet – they said that maybe they would serve some food in the bar at some point.  20150609 6316 point baker dock and community ctr r20150609 6301 point baker fire department rThe red building in the photo is the combination Post Office, Community Center, and Fire House – all in one 100′ long floathouse.  The Community Center had a table and some bookshelves, and in the back corner was the firemen’s gear.  The fire boat is sticking out of the end of the red building.  At low tide it might be impossible to get close to some of the houses if there was a fire.

Despite the lukewarm reception from the humans, Point Baker had fantastic sea life – due to the straight-through passages for the tide to run, and the proximity to the open ocean.  There were lots of sea otters and seals, and the anemones were plentiful and quite large.  I was able to kayak out the western channels at the end of the ebb tide and I found walls of small anemones just waiting for the tide to return, hanging gelatinous blobs kept company by a starfish or two.20150609 6310 starfish and dry anemones vertical rIn the deeper water, where they would remain immersed at any tide level, the plumose anemones were the size of my arms – yowza!  And here and there along the rocky shoreline were my little friends, the mink.20150609 6251 running mink r20150609 6292 point baker seaplane arrival rA seaplane landed with some supplies and a few people, but the postal plane didn’t make a landing while we were there.  The Postmistress was out on the seaplane dock with some mail bags and boxes, and the plane circled twice, but flew on.  Mail comes and goes on it’s own timetable in places like this.

We left Point Baker and cruised a few miles down to neighboring Port Protection, another small outpost community, but again the dock was mostly full of scruffy boats and there wasn’t any room for us.  We decided to keep going and begin our exploration of El Capitan Passage.