Cold Brook.

Cold Brook is one of several dozen named streams in the Keene drainage — a testament to how thoroughly this watershed forks and splits in the northeastern High Peaks. Without established access data or fishery records, it's likely a tributary feeder that runs high in spring and low by August, threading through mixed hardwood and hemlock before joining a larger flow toward the Ausable system. The name marks the water on older maps, but there's no public trail or known put-in — it's the kind of brook you cross on a bushwhack or hear from a ridgeline without ever seeing it up close. If you're on it, you're probably off-trail.