The New Hampshire Division of Parks and Recreation : Proposed Admin Rules
Not sure if anyone else has heard the hubub, but the NH Parks and Rec department is clarifying their rules on horses (don't go on trails <8 ft, pick up your poo) and are accepting comments. I know that the horse people have been very vocal against these rules:
Proposed Park Rules Spur Horseback Riders' Anger | New Hampshire Public Radio,
so mountain bikers should probably have their voices heard. The awesome re-route of lower Hemlock at Bear Brook got post-holed by a horse rider already. I'm not trying to start a whole anti-horse thread here, if you have comments, make them to DRED.
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Thread: Horses and NH state parks