No Gainer Creek-specific exception appears in the checked Region 4 table. It falls into the broader Trout Lake tributary bucket, where bull trout are catch-and-release. Default Region 4 stream rules otherwise apply: closed Apr 1 to Jun 14, trout and char catch-and-release Nov 1 to Mar 31, single barbless hook year-round. Confirm the current synopsis before you fish.

NRCan's Geographical Names database lists Gainer Creek as an official Kootenay Land District name at 50.661944, -117.348889. It runs stream order 4 (mid-range on a scale that runs from 1 for a headwater trickle up to 6 or more for a full river) and stretches roughly 11 km before joining Lardeau Creek. BC Geological Survey Bulletin 45 groups Gainer with Lardeau and Ferguson creeks as the largest streams draining the Ferguson map sheet, cutting steep valleys between high peaks on their way down to Trout Lake.

The local fish-record extraction found zero direct observations on Gainer Creek. What it inherits is an inferred sportfish context from the wider Lardeau system, where bull trout are the known, conservation-sensitive species. That inference is a working hypothesis, not a catch record, and it should not be read as a promise of fish in this specific drainage. Confirm fish passage, gradient and lower-reach access before planning a trip around it.

If a legal, fish-bearing reach turns up, small attractor and searching patterns fit high-country scout water: Stimulator, Elk Hair Caddis, Adams, Royal Wulff, Prince Nymph, Hare's Ear, Pheasant Tail and a small Woolly Bugger-style streamer for any sculpin or juvenile-fish water. Likely food, if a lower reach proves fish-bearing, follows the small-stream pattern of the wider valley: mayflies, caddisflies, stoneflies, summer terrestrials, tiny sculpin and juvenile fish.

No named trailhead, parking area or confirmed public access point has turned up for Gainer Creek. The Ferguson mining country it drains carries old roads and workings tied to the Mohican and Index-area prospects, so plan any visit as backcountry routefinding and confirm land tenure before you go. No guide coverage of Gainer Creek was found.