Lower canyon: Hyrum to the Left Hand Fork
The Blacksmith Fork leaves the mountains through a canyon that opens at Hyrum, southeast of Logan. Utah 101 turns up the canyon from town and follows the river the whole way, with the first pull-offs, a small hydro diversion dam and the USGS gauge on this page all in the lower canyon. This is where most of the catchable rainbows the Division of Wildlife Resources plants each summer are caught, and it holds the river's wild browns as well. There is no reservoir on the Blacksmith Fork; Hyrum Reservoir is on the Little Bear River, the next drainage south.
Main canyon to Hardware Ranch
About 14 miles of the canyon lie inside Uinta-Wasatch-Cache National Forest, with campgrounds and dozens of pull-offs along the highway, and the Left Hand Fork joins partway up. The road ends at Hardware Ranch Wildlife Management Area, the state elk feeding ground. The whole reach is pocket water and short pools that wade easily at normal flows and are not floatable.
Above Hardware Ranch
Beyond the ranch the river continues as a smaller stream with forest road and trail access. Native cutthroat become more common in these upper reaches and the tributaries, and the water stays cold through late summer when the lower canyon warms.
Brown trout
Wild browns are the main fish of the Blacksmith Fork and the reason the state gives the canyon a bonus brown trout limit. They hold in the undercut banks, log jams and boulder pockets, rise to the late spring salmonfly and golden stone hatches and to caddis on summer evenings, and are most aggressive in October before spawning.
Rainbow and cutthroat trout
Rainbows are hatchery fish (DWR planted catchable rainbows in the Blacksmith Fork in June 2026) and are caught mostly near the stocking points in the lower canyon. The native cutthroat here are Bear River cutthroat, the lineage the Utah Cutthroat Slam counts for the Bear River drainage even where old signs still say Bonneville; they live in the upper canyon and tributaries and take attractor dries.
Season and regulations
Utah's season is year-round, and the Blacksmith Fork is a common winter choice in Cache Valley because it stays open and low. From the first Utah 101 bridge at the canyon mouth to the headwaters the 2026 guidebook sets a limit of 1 fish over 15 inches and a bonus limit of 4 brown trout, for a total of no more than 8 trout if at least 4 are browns; there is no gear restriction. Runoff usually peaks in May and early June. The wading range local sources give for this gauge is about 60 to 250 cfs, and the river is too small to float at any level. Check the current Utah DWR fishing guidebook before you go.