Cooper Creek has no individual entry in the Region 4 synopsis. The nearest listed bucket, Duncan Lake's tributaries (4-27), carries bull trout release; Region 4 stream defaults apply everywhere else (no fishing Apr 1 to Jun 14, trout/char catch-and-release Nov 1 to Mar 31, single barbless hook year-round). Apply those defaults at minimum and confirm the exact bucket with Region 4 before fishing; do not assume Duncan River or Lardeau River mainstem exemptions carry over to this creek.

Cooper Creek stretches roughly 21 km and runs stream order 5 (well down the network toward river scale, on a system that runs from 1 for a headwater trickle up to 6 or more for a full river). Provincial fish-inventory data credits it with 39 recorded observations: 16 bull trout, 9 rainbow trout, 3 kokanee, 3 mountain whitefish, 3 general sculpin, 3 slimy sculpin and 2 burbot. That is a real fish signal, and bull trout carry it: a 2013 Kootenay Lake bull trout monitoring appendix lists historic redd counts of 64 on Cooper Creek itself, 53 on McKian Creek and 17 on South Cooper Creek. Those are spawning-survey numbers from the past, not a promise of current abundance or catch rates.

The same monitoring report rated Cooper poor as a repeat index stream despite its high habitat density, because crews need a helicopter to get in and still face poor visibility, real danger and high cost once they're there. That reads as backcountry conservation water first, not a roadside creek.

With bull trout carrying most of the recorded signal, this is char water above all else, backed by a smaller run of rainbow trout, kokanee, whitefish and burbot. If you fish it, and only where it is legal and the fish aren't spawning or staging, keep it to small-creek dry-dropper searching for resident trout on the margins, and cautious sculpin or fry streamer work well away from redds. The Goat Range Park management plan flags critical fish values on this system, including Gerrard rainbow spawning ground and provincially listed bull trout, which is the same conservation-first framing the monitoring data points to.

The practical food model runs on kokanee and fry, sculpin, slimy sculpin, juvenile trout, whitefish and burbot for the heavier layer, with mayflies, caddisflies, stoneflies and terrestrials filling in the lighter trout diet. Where it is open and ethical to swing a fly, Elk Hair Caddis, Adams, Stimulator, Royal Wulff, Prince Nymph, Hare's Ear and Pheasant Tail cover the trout, and a small Woolly Bugger, sparse sculpin or fry streamer, or a smaller Dolly Llama profile covers the char. No fishing guide lists Cooper Creek specifically; treat nearby Duncan and Lardeau operators as regional context, not creek-specific service.

No official trailhead, road status or parking area has been confirmed for Cooper Creek. The Goat Range Park management plan treats the upper creek as wilderness recreation-zone country, where conserving the natural environment takes priority over developed access, and it references a historic route linking Cooper Creek to Wilson Creek along with backcountry use around Mount Cooper and Meadow Mountain. Confirm current road, trail, tenure, bear and weather conditions before planning any trip here.