cnynrat
Expedition Leader
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Closing motorized access is usually done for preservation of a resource.
I think there are some occasions when the claimed resource preservation issue is a trumped up excuse to justify closing mechanized access in order to favor one recreational use over another.
A classic example from the past is when the Sierra Club fought against mountain bike access in the early days of mountain biking. At the same time the Sierra Club was working to restrict mountain bike access, they were promoting pack stock trips in the High Sierras. Not just taking the position that use of pack stock was OK, but actually running trips themselves, often encompassing fairly large groups.
I've seen the damage caused by pack stock in the Sierras. I've hiked along trails where the surface of the trail was 2-3' below the surface of the surrounding terrain due to the erosion caused by pack stock. I've hiked in the wake of pack trains with the flies and the stink they leave behind. I've seen the meadows trampled by carelessly tended stock. These impacts easily dwarf any damage caused by mountain bikes.
The Sierra Club justified pack stock trips because they were "traditional". They fought against mountain bikes because it wasn't their chosen form of outdoor recreation.
I have not kept up with the latest Sierra Club positions on mountain bikes - I did not renew my membership over this issue. I suspect their stance may have softened over time as mountain bikes have become more mainstream. But you see the change is not that mountain bikes cause any less damage, it's that Sierra Club members have discovered that they like to ride mountain bikes now.
As a reminder I am a proponent of preservation and our wilderness system - look back through some of my earlier posts in this thread. At the same time though, I can see that in some instances it is not applied in a balanced way, and is used to promote other objectives.