How to go fish the Diamond Creek (Idaho)

The months we list for the Diamond Creek (Idaho) are July, August, September. October is outside that window, so this brief is written for July, the next month we list.

July

No USGS gauge is mapped to this river.

Flies to tie — July

Caddis#14-18
Elk Hair Caddis
Pale Morning Dun#16-18
PMD Sparkle Dun
Ant (Terrestrial)#14-16
Foam Ant

Access

Diamond Creek Guard Station
42.701, -111.199parking
Diamond Creek below USFS boundary near Henry (USGS 13062650, historic)
42.773, -111.251parking

Regs — check current rules before you go

Idaho fishing license required. Blackfoot River drainage special rules (IDFG 2025-2027): May 1 through June 30 closed to fishing; July 1 through April 30 trout limit is 6, no harvest of Cutthroat Trout, no bait allowed. Verify current IDFG rules before fishing.

Pack list

A current state fishing licence
Waders and boots you have already leak-tested
Net, nippers, forceps
Floatant and desiccant
Tippet in the sizes the chart asks for
Water, sun cover, polarised glasses

Generic gear. Anything specific to this water is above.

Full hatch chart, access map and live gauge on the Diamond Creek (Idaho) page →