Idaho Fishing Reports · Upper Snake Region
Below Mesa Falls, the Henrys Fork runs through a canyon and then a long float from Warm River to Ashton, with good rainbows and browns.
Looking for the latest Henrys Fork (Warm River to Ashton) river report? This page is updated by the AvidMax fly shop team with live flows, current conditions, hatches and the flies working now on the Henrys Fork (Warm River to Ashton).
Current flows
Wind forecast
Henrys Fork fishing report
Updated November 7, 2026.
Flows are steady and clear for fall, with BWOs on cloudy days.
Streamers and nymphs work well from a drift boat, and the lower river near Ashton fishes year-round.
Load your fly box
Before you head to Warm River to Ashton, bring: Woolly Bugger #4-8, Pat', s Rubber Legs #6-10, Pheasant Tail Nymph #14-18, Zebra Midge #18-22, Parachute Adams #16-20, Elk Hair Caddis #14-16, RS2 Emerger #18-22, JuJu Baetis #18-22, Black Beauty #20-24, Egg #14-16, Squirmy Wormie #12-14, PMD #14-18.
Flies working right now
The flies above that we have in stock right now.
Henrys Fork details
| Access | Warm River boat ramp, Stone Bridge and the Ashton Reservoir area. |
|---|---|
| Elevation | About 5,200 ft |
| Nearest town | Ashton, Idaho |
| Best season | Year-round |
| Fish | Rainbow and brown trout |
| Regulations | Check the Idaho Department of Fish and Game seasons and rules before you go. An Idaho fishing license is required for anglers 14 and older, plus a steelhead or salmon permit where those fish are targeted. |
| Leaders and tippet | 9 ft leaders, 3X to 5X tippet |
| Camping | Warm River Campground |
| Kids | Partly. Easy access near Warm River. |
| Good to know | Lower Mesa Falls is upstream. Do not float above Warm River. |
Fishing by season
Winter
Midges and nymphs.
Spring
Mother's Day caddis and BWOs.
Summer
Salmonflies in late May and June, then caddis and PMDs.
Fall
BWOs and streamers for browns.
How to get there
From Ashton, take State Highway 47 (Mesa Falls Scenic Byway) to Warm River.