Idaho Fishing Reports ยท Southwest Region
The Middle Fork Boise River flows from the Sawtooths toward Arrowrock Reservoir, with rainbows and cutthroat and hot springs along the road.
Looking for the latest Middle Fork Boise 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 Middle Fork Boise River.
Current flows
Wind forecast
Middle Fork Boise River fishing report
Updated November 7, 2026.
Water is low and cold.
Nymphs and attractor dries in the pools.
Load your fly box
Before you head to Above Arrowrock, bring: Stimulator #10-14, Elk Hair Caddis #14-16, Pheasant Tail Nymph #14-16, Parachute Adams #14-18, Zebra Midge #18-22, RS2 Emerger #18-22, JuJu Baetis #18-22, Black Beauty #20-24, Egg #14-16, Squirmy Wormie #12-14, Scud Bomb #14-16.
Flies working right now
The flies above that we have in stock right now.
Middle Fork Boise River details
| Access | Middle Fork Road from Arrowrock to Atlanta. |
|---|---|
| Elevation | About 3,300 to 5,000 ft |
| Nearest town | Idaho City, Idaho |
| Best season | Summer and fall |
| Fish | Rainbow, cutthroat and bull 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, 4X to 5X |
| Camping | Forest Service campgrounds along the road |
| Kids | Partly. |
| Good to know | Washboard gravel road. |
Fishing by season
Winter
Snow.
Spring
Runoff.
Summer
Dries.
Fall
Low water.
How to get there
From Boise, take State Highway 21 and the Middle Fork Road past Arrowrock Dam.