Sulphur Creek is a useful upper-Bull entry because it has direct westslope cutthroat records and a clear tributary family. Dooley Creek, East Sulphur Creek and Olivia Creek give the drainage shape, but the angling confidence drops as you move into the inferred branches.
The water itself
The index maps about 17 km of Sulphur Creek. It is an upper Bull River tributary, so the practical questions are access, cold water, and which small reaches can handle angling pressure.
The fish
Westslope cutthroat are directly recorded. The model also carries the broader upper-Bull trout, char and whitefish signal, but this profile should stay conservative until field notes improve it.
How it is fished
Start with Adams, Royal Wulffs, Elk Hair Caddis, small Stimulators, beetles, ants, Hare's Ears and Prince Nymphs. Keep casts short and avoid turning headwater pockets into a numbers game.
Do not over-read the branches
Guides and access
No dedicated Sulphur Creek guide page was found. Bull River Adventures is the operator context for upper Bull tributaries; confirm current access and whether the creek is appropriate to fish.
Sources & further reading: Upper Bull River tributaries source note; BC Freshwater Fishing Regulations, Region 4 (2025-2027); Kootenay Fly Shop; St. Mary Angler; Bull River Adventures; local FWA/FISS beat model.