South Toby sits at 50.24011, -116.48663, running stream order 3 (low on a scale from 1 for a headwater trickle to 6 or more for a full river) across roughly 39 mapped channel segments before joining
Toby Creek. Government fisheries work on the broader Toby/Jumbo system found
bull trout throughout Toby Creek and cutthroat concentrated in the middle and lower Jumbo Creek reaches, and flagged the family's smaller tributaries as flashy, glacial-influenced water with limited winter habitat and low nutrient productivity. Nothing in that work singles out South Toby as either a confirmed fishery or a barren stream; it simply was not surveyed directly, and the only signal carried over for it is an inferred dolly varden presence.