Canada Fly Guide
Rivers & Lakes · River

Wild Horse River

A river in the St. Mary River watershed, a tributary of Kootenay River, holding Bull Trout, Kokanee and Westslope (Yellowstone) Cutthroat Trout in provincial fish-inventory records.
Updated July 31, 2026

Wildfire & Access

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Wild Horse River is a river flowing into Kootenay River. Recorded fish: Bull Trout, Kokanee, Westslope (Yellowstone) Cutthroat Trout.

The water

It flows into Kootenay River within the St. Mary River watershed (St. Mary River → Kootenay River). It runs stream order 5 (well down the network, toward river scale; the scale runs from 1 for a headwater trickle to 6+ for a river) and roughly 33 km. Bull Trout, Kokanee, Westslope (Yellowstone) Cutthroat Trout, recorded here in provincial fish-inventory data (8 records). Named tributaries: Boulder Creek, Fisher Creek, East Wild Horse River, Brewery Creek, Tackle Creek, Trail Creek, Wallinger Creek, Victoria Creek, Sunk Creek.

The fishing

As moving water, a tributary of Kootenay River, Wild Horse River fishes the way rivers of its size do: read the runs and seams, fish a dry-dropper through the warm months, and swing streamers or nymph the deeper slots as flows drop. Match the fly box to the season and confirm against a current local report.

water
River
St. Mary River watershed
straighten
Stream order 5
~33 km
set_meal
Bull Trout and Kokanee
8 records
footprint
Not A Casual Float

Conditions

  • Navigability: not a casual float: whitewater or canyon evidence on this water; treat as wade unless a guide says otherwise (median channel width ~21.4 m, wide; median gradient ~2.52%, moderate; peak mean-annual discharge ~2.626 m³/s, low flow; canyon-confined sections with ~178 m walls (DEM)).

Access & the rules

Access for Wild Horse River, meaning the roads in, put-ins and any walk-in or seasonal limits, is worth confirming locally before you commit a day. The drainage map shows how the water sits in its valley.

gavel

Before you fish

Confirm the current BC freshwater fishing regulations (Region 4 – Kootenay) before you go This water is part of the Kootenay River system.. Official synopsis: gov.bc.ca fishing regulations.