London Creek falls under the Perry Creek Classified Water (Region 4-20) rules as a tributary: bait ban, cutthroat and bull trout catch-and-release, brook trout daily quota 20, and a Class II licence when and where the water is open. Non-resident anglers need the St. Mary River classified licence. No fish presence has been confirmed on London Creek itself. Confirm the current synopsis before fishing.

upper St. Mary trend only; London Creek itself is ungauged, with no realtime station of its own

Weather reference: Cranbrook (49.512, -115.769).

London Creek carries an official name in the Kootenay Land District, at 49.511667, -116.064444 (key JARZD). It flows into Perry Creek, which in turn feeds the St. Mary River. Available mapping traces only a short second-order branch (order 2, near the headwater end of a scale that runs from 1 for a trickle up to 6 or more for a full river), and no direct fish observations were found on it.

With no confirmed fish presence, no access information and no guide coverage, there is nothing here to plan a trip around. If the creek does hold fish, treat it as small-water cutthroat habitat first: a light rod, a stealthy approach, and flies sized down for a tiny stream. A small Adams, Royal Wulff or Stimulator up top, and a Elk Hair Caddis, Hare's Ear, Pheasant Tail, Prince or Copper John underneath, cover the same stoneflies, mayflies, caddis, midges, terrestrials, fry and sculpin that the wider Perry drainage sees. None of that is a reason to fish blind water without confirming presence and access first.

No access route, trailhead or parking has been confirmed for London Creek. The nearby St. Mary Angler and Three Bars Ranch operate on the St. Mary and Perry corridor generally, but neither lists London Creek specifically, so treat them as parent-water context rather than proof of access here.