No Farnham Creek-specific exception appears in the Region 4 regulations synopsis, so default Region 4 rules and in-season notices apply. Confirm the current Region 4 synopsis before fishing, and keep in mind that fish presence here itself is unconfirmed.

The creek's confluence sits at 50.46695, -116.52210, within the wider horsethief creek tributary group that also includes Stockdale Creek, Paulding Creek, Bruce, Law, McDonald, Red Line, Gopher, Andreen, Haultain and Fan creeks. It drains toward the columbia river by way of Horsethief Creek. It 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) across 97 mapped channel segments. The channel geometry reads as a moderate-width, moderate-gradient mountain tributary: median width ~11.6 m (moderate, wider than most of its Horsethief cousins but well short of driftable size), median gradient ~2.15% (gentle to moderate), and peak mean-annual discharge ~2.401 m³/s (low to moderate flow).

With no confirmed fish records, Farnham Creek is a scouting water rather than somewhere to plan a trip around. If you do explore it, and only once legal access is confirmed, keep it to light small-stream gear on the chance a resident population turns up: an adams or royal wulff on top, an elk hair caddis or stimulator for any surface activity, and a hares ear nymph or pheasant tail nymph worked underneath. Likely forage, if fishable habitat exists, follows the regional small-stream menu of caddisflies, mayflies and small stoneflies, with summer terrestrials adding hoppers and ants where the water is fishable. The wider Horsethief family carries kokanee, bull trout, mountain whitefish and westslope cutthroat trout downstream, but none of that is confirmed for Farnham itself.

There is no confirmed public access route, trailhead or put-in on record for Farnham Creek. The wider Horsethief Creek country mixes Crown and private land, so confirm legal access and current land status before making the trip.