Idaho Fishing Reports ยท Lakes ยท Upper Snake Region
Island Park Reservoir on the Henrys Fork has rainbows, kokanee and brook trout, best fished by float tube or boat in the shallow arms.
Looking for the latest Island Park Reservoir fishing report? This page is updated by the AvidMax fly shop team with current conditions, wind, stocking news and the flies working now at Island Park Reservoir.
Water level
Wind forecast
Island Park Reservoir fishing report
Updated November 7, 2026.
The reservoir is low in fall after irrigation season.
Leeches and small nymphs near the old river channel and inlet arms.
Stocking report
See the Idaho Fish and Game fish stocking schedule for the latest stocking at Island Park Reservoir and other Idaho waters.
Load your fly box
Before you head to Island Park Reservoir, bring: Mini Leech #8-10, Woolly Bugger #6-10, Zebra Midge #14-18, Callibaetis Nymph #14-16, Balanced Leech #10-12, Balanced Bou Leech #10-12, Slump Buster #6-8, Egg #12-14, Scud Bomb #12-16.
Flies working right now
The flies above that we have in stock right now.
Island Park Reservoir lake details
| Access | Ramps at McCrea Bridge, Buttermilk and the dam. |
|---|---|
| Elevation | About 6,300 ft |
| Nearest town | Island Park, Idaho |
| Best season | Late spring through fall |
| Fish | Rainbow and brook trout, kokanee |
| Regulations | Check the Idaho Department of Fish and Game 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 to 12 ft leaders, 4X tippet |
| Ice fishing | Ice fishing in winter. |
| Camping | Buttermilk and McCrea Bridge campgrounds |
| Kids | Partly. |
| Good to know | Low water exposes mud flats in fall. |
Fishing by season
Winter
Ice fishing.
Spring
Ice-out and chironomids.
Summer
Callibaetis and damsels.
Fall
Leeches and low water.
How to get there
From Ashton, take US-20 north to Island Park and the McCrea Bridge road.