No Fan Creek-specific exception appears in the checked Region 4 synopsis, so the regional defaults apply: streams are closed Apr 1 to Jun 14, trout and char must be released outside the general open season, and only a single barbless hook is permitted in streams. Confirm the current synopsis before you fish.

Fan Creek's mouth sits at 50.54984, -116.47655. It runs stream order 3 (low on the 1-to-6+ scale where 1 is a headwater trickle and 6+ a river), a narrow channel with a median width of roughly 2.6 m, dropping at a very steep median gradient near 38.55%, with a peak mean-annual discharge of about 0.077 m³/s (very low flow). That combination, narrow, steep, low-volume, reads as a classic headwater tributary rather than a stream built for a day of fishing.

No fish records turn up for Fan Creek in the provincial stream data covering the Horsethief Creek watershed, and no guide, report or online log names it specifically. That is not proof of an empty creek, small steep headwater tributaries are routinely under-surveyed, but it does mean Fan Creek is honestly a regulation-and-access check rather than a confirmed fishery. If it does hold coldwater fish, the character of the wider Horsethief system points toward small-stream basics: caddis, mayfly and stonefly imitations with summer terrestrials, but that is a hypothesis carried over from the surrounding watershed, not a record from Fan Creek itself.

No named trailhead, road access point or put-in has been confirmed specifically for Fan Creek. It sits within the wider Horsethief Creek drainage in the Columbia Valley, part of the tributary network feeding the upper Columbia system around the Radium-Invermere corridor, but the exact route in remains unconfirmed.