JackM wrote:
Going back and reading your comments about Poe Lake, I must acknowledge that I jumped the gun in inferring that you were actually suggesting the lake not be rebuilt. Giving fair read to your comments I see that you were not doing so. Rather, you suggested that IF it wasn't rebuilt, some effort should be made to restore the stream to a coldwater resource.
This brings up the other portion of my "90% comments." While it would be admirable for some group to attempt to assist the stream to recovering it's prior natural state, such action is probably not needed. These elements of the environment have a way of restoring themselves once the unnatural hinderence is removed. Just as with the 90% of wild trout streams I postulated in my example, doing nothing to hinder recovery is probably all that is required.
Just to clarify, I am opposed to the rebuilding of the dam.
The 90% comments are interesting. Allowing natural restorative processes to occur is known in the conservation field as "passive restoration." As you say, in many cases removing unnatural hindrances is required to allow those processes to occur. And at other locations, what is required is the prevention of new unnatural hindrances.
This is all a big part of what conservation is all about. So, it's not DIFFERENT than conservation, it IS conservation, and always has been.
If you hope to achieve these goals, it requires active conservationists to win the political battles necessary to: 1) remove unnatural hindrances 2) prevent new ones. (Case in point, the dam on Poe Creek.)
So, the idea that 90% of streams don't need help is just not so.
Also, passive restoration works in many cases, but there are a great many cases where it does not work. The most obvious example in PA is with acid mine drainage. If you just leave it alone, the streams will in most case stay dead. There are places where mining took place at the time of Roman Empire that are still draining toxic materials into streams today. You either take active steps to fix it, or society will just suffer with polluted streams indefinitely.
In many cases streams that have suffered from severe physical alterations will not self-restore, at least not within what most people would consider a reasonable time frame. In the forested regions of the state, many streams were highly altered, essentially channelized, during the early logging days. Many of these streams have been just out there in the woods in state forests and gamelands for over 100 years. They are not even close to self-restoring themselves and their is little indication that they would do so in another 100 years. There are ways to get more normal habitat-forming processes working again. It would require some effort and some money to get the streams out of their extremely altered structure and into a more normal stream/floodplain configuration, where natural processes could then begin to unfold, and the self-restoration processes could then take place with little to no further intervention or cost.