Onion Brook flows through the southern fringe of the Indian Lake region — a tributary system in country that sees more logging roads than hiking traffic, and more snowmobile routes in winter than paddlers in summer. The name shows up on USGS quads but rarely in trip reports; it's working forest, not High Peaks, and the brook itself is modest by Adirondack standards. No fish data on file, no formal access points, no reason to go unless you're hunting, snowmobiling the Cedar River corridor, or piecing together a bushwhack route between the Moose River Plains and the Cedar River Flow. If you know where Onion Brook is, you probably already know why you're there.
Closest parking lots within range, ranked by walking distance. Accessibility flags come from Google verified-data; surface and capacity from OpenStreetMap. Confirm hours and seasonal closures before you go.
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What to do, where to stay, and what's reopening across the Park as the snow melts and the calendar fills.
A complete planning guide: difficulty by peak, common combo days, seasonal realities, and a sortable, filterable table of every summit.
Overnight, day, and trip camps in the Park — the camp belt, choosing the right fit, costs and financial aid, ACA accreditation, and the questions every parent should ask before they commit.