Monday, August 31, 2015

Shanty Brook and Mud Ponds

Nestled into the southeastern corner of the Siamese Ponds Wilderness are two bodies of water called the "Mud Ponds". My 1994 ADK guidebook (Central Region) calls these two remote ponds "jewels in the forest" and the book notes that the ponds were probably named by guides who wanted to deter visitors to favored fishing ponds. That deception is no longer necessary. These ponds are not easy to get to.

The route to the Mud Ponds follows an old path into the Siamese Ponds Wilderness and that path, as described in the ADK guide, is well on its' way to being fully reclaimed by the forest. The route has not seen any trail maintenance in decades and whatever hiker traffic it does receive is barely enough to keep the way open. Past the first couple of miles constant attention is required to avoid losing the path and the last mile to the ponds has deteriorated to the point where it should be approached as straight up bushwhacking.

As mentioned, the trail to Mud Ponds via Shanty Brook is described in the 1994 edition of the ADK Guide to Adirondack Trails - Central Region trail guide. Using TopoView to look at USGS topographic maps of the area I see that the trail all the way to the ponds is not shown on large scale (1:24,000) topographic maps from the 1990s but it does appear on the 1994 edtion of the 1:100,000 Raquette Lake map. The first appearance of the trail is on the 1957 edition of the 1:62,500 Thirteen Lake map. So the trail first appears on a USGS map in 1957 and it is gone from maps published after 1994. But that does not mean that the trail had faded from all current maps. The trail does appear on a current edition of the Trails Illustrated Northville/Raquette Lake map. That map was apparently sourced from the earlier ADK map that came with the ADK guidebook (it replicates minor errors present on that map). Looking at a new and nicely printed map it's easy to make assumptions about the accuracy of the information. Maps, like all documents, fall out of date and sometimes even the best maps are just wrong. Something to keep in mind.    

The route overlaid on a recent USGS topographic map (Bakers Mills, 1997, 1:24000). The red line shows the route I followed and the purple line shows the route I would follow if I went back to try again. This map no longer shows a trail from the brook crossing to the ponds and to reach Mud Ponds you'll need to bushwhack that last mile. 
The first challenge in visiting Mud Ponds is finding the trailhead. If you take Route 8 from Wells the parking area is on the right about ten miles from the place where routes 30 and 8 split. It's a large paved pull off with two entrances so you can't miss it. Except that it looks like an abandoned rest stop and there are no signs. The ADK guide says that you should park in this lot and walk up Rte 8 for a couple hundred yards to a dirt road that leaves the highway on the river side. You certainly can do that, but you can also park on the dirt road itself. There are several primitive campsites and plenty of room for cars to be parked alongside the road.

From the entrance to the dirt road you need go only 30 yards before an obvious path down the steep bank is seen. The guidebook states that two cables were stretched over the river at that point but no cables are present. If you look closely, however, you'll spot a tree with clear marks where a cable previously cut into the bark. When the water is low the river can easily be waded at that point and the trail is clearly visible entering the woods on the far side. Alternatively, if you work your way upstream for 75 yards you'll come to a spot where you can have a go at rock hopping across. You'll need to be nimble to get across with dry feet. And those missing cables? They are lying in a tangle a few feet into the woods on the far side.

The trail is pretty good as far as the first vlei. It's about as remote a spot as you'll find anywhere for a walk of less than two miles.
The first stretch of trail is easily followed but narrow. Just push your way through the trees and shrubs that are rapidly filling in the corridor. You won't go far before you'll encounter the first of the dozens (scores? hundreds?) of downed trees that cross the path. Repeat after me, "over, under or go around; over, under or go around." This is a decision you'll make many times on this route. After a quarter mile the trail comes along side Shanty Brook and opens up a bit. At .6 miles you'll come to an obvious path leaving the main trail on the right (east side). The trail and the brook are separated at this point but you should be able to hear falling water. The side path leads a short distance to an overlook above the first of a series of falls and cascades on Shanty Brook. This falls is quite impressive with a 15 foot vertical drop into a rock walled chasm. The falls is well worth a look and a worthy destination in its' own right. But take care; the side path comes rather abruptly to to a vertical drop near the top of the falls. 

Falls on Shanty Brook. Looking down from the top.

The route beyond the falls continues to be easy to follow and at about 1.3 miles the path crosses Shanty Brook. Crossing the brook could be difficult in times of high water but few will actually face that challenge. If crossing the brook will be difficult then crossing the Sacandaga East Branch will be a much more significant challenge. 

At just under two miles you reach a large open vlei. This a pretty spot and it too could stand as a worthy destination. Past the vlei the path generally stays close to Shanty Brook as it meanders through a valley where many generations of beaver have dammed the stream. The path through this stretch remains generally easy to follow and in places where it fades a bit of searching should get you back on track. Someone has tied orange marker tapes to tree branches in a few places; perhaps to help them find their way back.

Looking across the first vlei towards the Blue Hills.


Past the first vlei the route stays close to the edge of Shanty brook. Recent beaver activity has backed up the stream in several places flooding the banks. Yes, that is the path disappearing into the muck. This is one of many places where you'll need to work around an obstacle and then try to pick up the path again on the other side. 

If you are aiming to visit the Mud Ponds you'll reach the critical juncture about 2.7 miles from the start. I didn't realize it at the time but when you reach the place where the path passes close to a solid looking beaver dam (at the lower end of another large vlei) you have reached the turning point. I continued northwest following a faint trail along the east side of the vlei. After a few minutes of walking, however, all traces of the trail faded away. This, along with the fact that I was bearing due north --not the expected direction-- led to the realization that this could not be the correct way. I knew that the route to Mud Ponds makes a 90 degree turn from northwest to southwest about 2.7 miles from the trailhead and I had clearly gone too far. Making my way back to the previously mentioned beaver dam it dawned on me that the beaver had flooded the place where the path crossed the brook and turned to the southwest. Crossing the brook below the dam I searched along the west edge of the vlei until I found a faint path emerging from the pond. That path looked promising but it soon reentered an area flooded by past beaver activity and was lost.

According to my map it's just over a mile from the turning point to the outlet of the upper pond (the point between the two ponds). I worked my way through the tangled forest mostly within sight of the stream/mud flats/vlei/beaver ponds for over an hour to reach a point where I could just see the lower pond through the trees. This route passes through a young second growth forest with a particularly dense (and annoying) understory. Looking towards the ponds all I could see was more tangled and swampy terrain so I called it a day and turned around. Whatever path once existed has been fully reclaimed by the forest and I make that statement with confidence because I expended considerable energy searching up and down the slopes trying to pick the up the path (with the hope of easier going). And you can find faint remnants of a path. There are several places where a distinct footpath can be found and followed. But in each case the trail is soon lost in tangles of blow down or where beaver activity has flooded the way. So, despite what you might see on a map, there is no trail from the stream crossing to the Mud Ponds.

I may go back some day and the knowledge of what to expect will make it much easier to reach the ponds. I'll probably climb up the slope of Blue Hills Mountain a short ways and head straight for the outlet of the upper pond. Contouring around the shoulder of the mountain will add some climbing but it will reduce the distance and it will (hopefully) avoid the worst of the tangles.  Treat this section of the route as pure bushwhacking and pick the path of least resistance. Attempting to follow the old trail requires extra effort for no significant benefit.

Sunday, August 9, 2015

The Pine Orchard: You Know When You Are In It

The Pine Orchard is a well known stand of old growth White Pine and Hemlock near Wells (NY). If you read this blog you know that I'm always on the look out for the big old trees, so a visit to the Orchard was long overdue. I'd read that the Pine Orchard contains trees up to seven feet in diameter but, I have to admit, I was skeptical. I wondered if trees, like fish, get bigger with each telling of the tale. I was prepared to be underwhelmed by the Pine Orchard. Happily, I was wrong. The Pine Orchard is impressive and these may very well be the largest and oldest trees in the southern Adirondacks.

But how big --exactly-- are the pines in the Pine Orchard? I measured a few trees and the largest one I found has a diameter of 51 inches; just over four feet. I took this measurement by stretching a cord around the tree four and a half feet above the ground. The distance on the cord measured 161 inches and dividing that by 3.14 yields the diameter: 51 inches. That's not the six to seven feet that some have reported but I might not have measured the very largest trees. And while measuring the diameter at four and half feet is standard practice in forestry circles, others might have done it differently.

I'm interested in the history of the Adirondack forests and the large old trees have stories to tell. So I look for them when I hike. Over the past several years whenever I've spotted a large tree I've noted the location and estimated the size. Now that I've refined my measurement technique I see that my past estimates may have tended towards the high side (No, Dad, this does not apply to fish I've caught in the past). I carry an old ski pole as a walking stick and I've used the pole as a gauge for estimating tree diameters. I now see that this technique is insufficiently precise. In the Adirondacks, trees with diameters of 36-40 inches are found in many places. Trees of that size will typically be more than 125 years old and a stand containing many trees of that size may have been passed over, or selectively logged, in the first wave of industrial logging. That first wave took place after 1850 and continued into the early part of the 20th century. You can also find trees with diameters larger than 40 inches scattered about in the Adirondacks, but these are much less common. These trees were almost certainly standing before 1850. The really big and old trees, with diameters of 44 inches or larger, are rare. The Pine Orchard contains a number of trees in the 44-48 inch range and estimates that I've seen place the age of the stand at over 200 years. (Note: the correlation between tree size and age varies with species and growing conditions).

Image One: A large White Pine near the point where you first reach the Pine Orchard Stand. The strand of yellow yarn is one foot in length.

The Pine Orchard: Old Growth Forest


The Pine Orchard is old growth. At 200 years without external disturbance the forest has reached the climax stage in terms of ecological succession. For this location, and given whatever circumstances protected it originally, that means mature White Pine with some Hemlock and a few old hardwoods mixed in. Stands of old growth pine are often compared to a cathedral and that description applies to the Pine Orchard. The forest floor is blanketed with a deep layer of pine needles that absorbs sound and this is an airy, quiet, place. I was there on a very warm day and it was pleasantly cool under the cover of the large trees.


Image Two: The cathedral in the pines. The forest floor is covered with a two century accumulation of pine needles. Smaller trees are mixed in but the canopy is dominated by the large White Pines.

The Trail and the Hike


The route I followed leaves the Pumpkin Hollow road at the Murphy Lake trailhead. As with the the trail to Wilcox Lake this route is marked and maintained as a snowmobile trail. The 1994 ADK guide to Trails of the Southern Region described this trail as indistinct and hard to follow. That Guide advised that this route should be attempted only by hikers skilled with map and compass and it went so far as to say that the trail was not recommended for parties of fewer than three people. 
Image Three: From Google Earth. The entire route covering 5.9 miles each way.

That guide was written over 20 years ago and much has changed. I don't know whether the warning was justified when the book was written, but it is not true today. The route generally follows old woods roads and it for pleasant walking. There are a couple places where arrows (signs) point the way. Not because the trail is indistinct but because multiple old woods roads intersect and it could be difficult to pick the correct route. Interestingly, the warning from the ADK guide was carried over to a much newer map. My favorite trail maps these days are the "Trails Illustrated" Topographic Maps produced by the National Geographic Society. The Northville/Raquette Lake map covers the southeastern Adirondacks and that map restates the warning about parties of "at least three persons" word-for-word.

There is also a meaningful discrepancy in the length of this route as stated on signs and as printed in various guides. As measured using GPS my hike covered a total of 11.8 miles. This included a bit of wandering around so the sign board at the road which states the distance to the Pine Orchard as 5.6 Miles is reasonably accurate. The 1994 ADK Guide lists the distance at 6.6 miles one way. And a third distance, derived by adding up distances seen on signs along the way, yields a total of 4.2 miles. Applied to the round trip, the difference between the shortest and longest mileage is over four miles. That's a serious lack of accuracy.

There are two apparent sources for the uncertainty. The first is that there is no distinct point or boundary to mark your arrival at the Pine Orchard. The lack of a clear "here it is" location accounts for a tenth mile or two of the discrepancy. This is a question of precision. Lacking a distinct end-point it's difficult to measure the distance to the tenth of a mile precision typically used on trail signs. The second consideration is that over the past 30-40 years the trail has been re-routed, probably more than once. The 1994 ADK Guide alludes to this noting that the trailhead had been moved to avoid a crossing of private land. This is also evident in an old sign seen at the junction with the Flatters trail. The sign says that it is 2.6 miles to the "Willis Lake Road" but the trail doesn't go to the Willis Lake Road. That was probably the original starting point. If the sign stated the distance as "a few miles" it would be more accurate but not very precise. As it sits, it is neither.   

Image Four: Stanton Miles: When our children were young we would take them hiking and the first thing they wanted to know was; "how far is it?" To which I would respond "a couple of miles." It took only a few outings for them to realize that my "couple of miles" could be anything from two to five miles. That answer is accurate but not very precise and my scale became known in the family as "Stanton Miles." If you use Stanton Miles the difference between what appears on the sign and the actual distance of four miles is accounted for.

Uncertainty, Accuracy and Precision


Measuring the diameter of a tree is pretty easy. And collecting measurements from many trees is a straightforward process:
  • Measure the tree
  • Record the location
  • Record the species
  • Note unusual or complicating factors
  • Repeat
That sounds easy enough, and it is easy. Which is why I am continually surprised by all the different ways that uncertainty creeps into the data. Part of it comes from doing this work in the Adirondack Biting Insect Preserve. During the warm months you encounter many many small complications and distractions and for the rest of the year your fingers will be numb making it difficult to write out notes. But sometimes I run into more specific issues:
  • Diameter: What about double-trunk trees? Or trees in difficult locations? What if there is a branch or some other oddity at the 4.5 foot height where I want to measure?
  • Location: Assuming that the accuracy level of your GPS device is good enough, and assuming that you have a good signal from several satellites, and assuming that you correctly note which location goes with which tree, it nothing more than the push of a button.
  • Species: I'm familiar with most tree species seen in the Adirondacks, especially the species that get to be big. Still, when I have gone back and looked at the same trees a second time I've found that I get some of the them wrong.
  • Notes: Some days I do a good job of recording the unusual or complicating factors and some days not so good. And this information often turns out to be important when trying to draw conclusions from a body of data.
On one point I have no doubt. All non-trival data contains errors and considerations of precision and accuracy are relative to the intended use. These are the sources of uncertainty.

A Couple of Miles: I was just being accurate


As often happens, the use of a tool under less than ideal conditions leads to a deeper understanding how the tool works. Using GPS to record locations and to record the tracks I've follow has given me a deeper understanding of how the system works. I'm going to return to this topic in the future but a few key points go right along with the theme of this post. First, take a look at image five. The lines show a short section of the track captured by my GPS receiver on the hike to the Pine Orchard and back. The line on the left was from the inbound leg of the trip and the line on the right is from the return trip. I walked the same path both ways so it's odd that the the lines are so far apart. To get to the bottom of this you need to know something about how I hike.

I took much longer to complete the trip to the Pine Orchard then I did on the return and this is typical for me. And this was not because of the terrain. The route crosses a couple of small ridges but there is very little difference between the elevation at the turn around point. It's counter intuitive, but I typically travel at a slower pace on the way in because I'm fresher. On the way in I stop to record measurements, I take photos and I generally take more time to enjoy the forest the scenery. On a hike of this distance by the time I'm half way back to the car I'm starting to get tired. And this is the counter-intuitive part, I tend to walk faster and I move along without stopping. On this particular day, it was hot and by the time I reached the area shown in image five I'd been hiking for over five hours. It was also into the early afternoon and I was I not hiking alone. I was traveling with dozens of new (and now really annoying) friends that I'd made along the way. Deer flies, midges, mosquitoes and a few too-stupid-to-just-give-up-and-die black flies. The bug spray that had been mostly effective earlier in the day was no longer working. 

Image Five: GPS Accuracy 
The lines in the image show a short segment of the track captured by my GPS receiver on the hike to the Pine Orchard and back. The line on the left was from the inbound leg of the trip and the line on the right is from the return trip. I was walking on the same path for both legs of the journey, so you might expect the lines to be very close to each other. (Map Image from Google Earth)

A GPS track like the one shown in the image is recorded as a series of points. Every second or so (this will vary based on the device) the GPS receiver calculates your location and stores the coordinate pair representing that location.  When you stop the receiver gets extra time to correct for errors so stopping periodically improves the accuracy of the track overall. This is especially true when walking through a dense forest where the strength of the signals is reduced by foliage. In image five I added a note to a place where it looks like I took a short side trip off the trail. But I know that that never happened. What did happen is that the GPS recorded a couple of points with much lower accuracy and those points became part of my route. If I was planning to use this track as data I would need a method to clean up these kinds of errors. 

There are many factors that limit the best case accuracy of GPS. A GPS receiver captures signals sent by satellites orbiting the earth and when the receiver has signals from at least three of these satellites it can calculate your location. The U.S. GPS system uses a constellation of 32 satellites positioned so that there should always be at least three satellites above the horizon and "visible" to a GPS receiver located anywhere on the earth. Under good conditions a typical consumer GPS receiver can fix your location to within about 10 yards -30 feet- using signals from three satellites (four are required to also calculate your elevation). At that accuracy level you use the coordinates calculated by the receiver and place a point on a map. Then you draw a circle with a diameter of 30 feet around the point. Your actual location lies somewhere in that circle. 

Depending on what you are trying to do that may or may not be accurate enough and it's usually possible to get much more accurate data. For instance, it's common for there to be more than the minimum of three satellites available to your receiver. Modern GPS receivers including the ones found in most smart phones, use the "extra" satellites to average out some of the errors that otherwise limit GPS accuracy. For example, when I save a waypoint (the coordinates for a single location) using my Garmin GPS it tells me how accurate the fix will be based on the set of satellites available to it. The use of additional satellites and averaging commonly improves accuracy into the ten to twenty foot range. On the other hand, dense foliage, cliffs, mountains and other obstructions reduce accuracy or prevent the receiver from getting any fix at all.

The point is that data taken from measurements is always uncertain to some degree and the level of uncertainty varies based on the specifics of how you gather the data and your intended use. You have to ensure that your data is accurate enough for the intended use and you have to avoid mis-representation by overstating the level of precision. When I use a cord to measure the circumference of a tree, if my measurement is accurate to within one inch then I can state the diameter in inches. Dividing the circumference by Pi to get the diameter will almost always yield an answer with a remainder, something like 45.3. But the .3 must be thrown away. The accuracy level of my measurement does not support that level of precision. If a trail sign states a distance as 2.6 miles, then assuming typical rounding to the nearest tenth we can say that it's accurate if the actual distance is between 2.55 and 2.65 miles. Assuming, of course, that it's the correct sign for the trail you are on. My GPS gives me coordinates with 6 decimal places of precision. That's precise enough to separate locations that are just inches apart. But the device is not nearly that accurate and the last digit (and maybe the last two) should be discarded. The extra precision is meaningless at best and misleading at worst. Whenever we take measurements there is uncertainty and the level of precision we use should not overstate the accuracy of our technique. 

You see kids, when I said it was a "couple miles" I was giving you the most accurate answer that I could.