Wednesday, November 30, 2011

Bridge Three Stream Course Change

GNC Bridge Three
This is our newest bridge at Gorman.  It replaced the old one which was washed down stream between one and two years ago.  It is also our longest bridge with support in the center as you can see.  The stream is interesting to me.  It changes course WHEN IT WANTS TO.  I don't know who does the bridge.  I am sure that they are volunteers and it is a wonderful service to all of us who walk the trails.  I have watched them try to change the course of the stream as they work.  They dug, I suppose by hand, a new channel when they built this bridge.  The channel they dug was the one on the right in this shot.  It has recently closed and the new channel goes to the left of the bridge support in this shot.  That is now the primary channel.  

Another thing they did when they built this bridge was to divert the channel to the back of the photographer in this shot.  Previously, it made a large loop out of the forest and into the meadow and returned to the forest.  They cut that loop out and tried to divert the stream in a more direct path on its way down stream.  So far, that loop is still not being used.  It started behind and to the right of the photographer in this picture.  There is a sharp bend at that point and it is being eroded more each time we have lots of rain.  I predict that the stream will eventually go back around that loop though it may take several months or years.  


As I said earlier, the stream goes where it will.  I find it interesting to observe what it does.  It does not look very formidable in this shot but it can be a raging torrent when the rains are heavy.
 

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