🐟 What fish can you catch in Irwin?

Most commonly caught species around Irwin , ID : Cutthroat trout - 534 reported catches Rainbow trout - 334 reported catches Brown trout - 259 reported catches Smallmouth bass - 142 reported catches Brook trout - 77 reported catches .

📢 What are the latest Irwin fishing reports?

The latest Irwin , ID fishing reports are: @kaitlin.weaver reported a nice Largescale sucker at Snake River (Palisades Res. - American Falls Res.) . @GarrisonPinn reported a nice Smallmouth bass . @Rymerr85 reported a nice Brown trout . @brytonlarson reported a nice Largescale sucker . @deaconsaulters reported a nice Cutthroat trout at Teton River . .

Fishing in Irwin, ID

Q: 🎣 Where to fish in Irwin, Idaho?

Anglers in Irwin , ID recommend these top fishing spots: Snake River (Palisades Res. - American Falls Res.) , Snake River , Palisades Reservoir , Trail Creek Pond , Big Elk Creek .

Q: 📅 What is the best time to go fishing in Irwin?

Download the Fishbrain app and see today's Fishing and Weather Forecast for Irwin , ID . We give you weather trends and help you find the perfect window to catch your next personal best. With Fishbrain Pro , you will get the following capabilities: Plan smarter: Get hour-by-hour fishing weather conditions. Fish at peak times: Use BiteTime™ predictions to maximize catches. Stay ahead of the weather: Get hyper-local, real-time updates. .

Q: What's the biggest Cutthroat trout caught in Irwin?

The biggest Cutthroat trout (by length) reported in Irwin , ID was a 2 ft caught by Fishbrain user @kmerrick3928 at Teton River on October 17, 2020 .

Q: What's the biggest Rainbow trout caught in Irwin?

The biggest Rainbow trout (by length) reported in Irwin , ID was a 17 lbs caught by Fishbrain user @harrisonsahm at Snake River (Palisades Res. - American Falls Res.) on July 11, 2024 .

Idaho, United States

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Top fish species in Irwin

Latest Irwin fishing reports

Largescale sucker

Snake River (Palisades Res. - American Falls Res.)

length · weight

Smallmouth bass

length · weight

Brown trout

length · weight

Largescale sucker

length · weight

Cutthroat trout

Teton River

length · weight

Largescale sucker

length · weight

Brown trout

Teton River

length · weight

Rainbow trout

8 in · 6 oz

Mountain whitefish

length · weight

Brook trout

length · weight

More catches in the app...

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Fishing regulations in Irwin

Disclaimer: Always check local fishing regulations, water access rights and land ownership before fishing, regardless of any catches logged in that area by the Fishbrain community. Fishbrain has mapped millions of acres of government-owned land across the USA to help you identify potential fishing access, but you are responsible for ensuring compliance with all legal requirements.

Fishing regulations in Idaho can change throughout the year. Make sure to check this page before fishing for the most up to date rules and regulations for the current season. Local regulations govern when you can fish, the max size of the fish you can keep, how many fish you can keep, and more.

Below you will see fishing regulations for catching Cutthroat trout as of May 11th, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.

Select species

Cutthroat trout

Seasons

Open

Bag limit

Aggregate

Daily bag limits apply to all waters of the Upper Snake Region except as modified in Upper Snake Region Special Rule Waters. The possession limit is 3-times the daily bag limit.All waters open all year except as modified in Upper Snake Region Special Rule WatersFor more information please see https://idfg.idaho.gov/rules/fish p 35-36

Special Rule Waters for the Upper Snake Region

Beaver Creek and tributaries

Trout limit is 6, no harvest of Cutthroat Trout

Becker Pond (Ryder Park Pond)

2 fish any species

Big Lost River and tributariesDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release
whitefish limit is 0, catch-and-release

Saturday of Memorial Day weekend through November 30

trout limit is 6
whitefish limit is 0, catch-and-release

Dry Beds (Snake River)Section: From the Highway 48 bridge upstream to the Great Feeder irrigation diversion headgateMay 1 through March 31

Upper Snake Region general rules apply

April 1 through April 30

it is legal to take fish with dip nets, by snagging or by hand
Upper Snake Region bag limits apply

Fall River and tributaries

Limit is 2 trout, no harvest of Cutthroat Trout

Fish Creek (Harriman State Park)

Trout limit is 6, no harvest of Cutthroat Trout
Fly-fishing only

Golden Lake (Harriman State Park)

Closed to fishing

Henrys Fork (Snake River, North Fork) (see map on page 37) Section: South Fork Snake River/Henrys Fork confluence upstream to Vernon Bridge

Trout limit is 2, no harvest of Cutthroat Trout

Section: From Vernon Bridge upstream to Ashton DamDecember 1 through Friday before Memorial Day weekend

trout limit is 0
catch-and-release only

Saturday of Memorial Day weekend through November 30

trout limit is 2, no harvest of Cutthroat Trout

Section: From Highway 20 bridge upstream to the posted boundary upstream of Riverside Campground

Trout limit is 2, no harvest of Cutthroat Trout

Section: From the posted boundary upstream of the Riverside Campground upstream to the lower Harriman State Park boundary

Trout limit is 0, catch-and-release, no bait allowed, barbless hooks required

Section: From the lower Harriman State Park boundary upstream to the upper Harriman State Park boundary (Harriman Ranch)December 1 through June 14

closed to fishing

June 15 through November 30

trout limit is 0, catch-and-release, fly fishing only, barbless hooks required

Section: From the upper Harriman State Park boundary to Island Park Dam

Trout limit is 0, catch-and-release
No bait allowed, barbless hooks required

Section: From McCrea Bridge upstream to the Henrys Lake OutletDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, only 2 may be Cutthroat Trout, no Cutthroat Trout under 16 inches

Section: From Henrys Lake Outlet upstream to the head of Big Springs

Closed to fishing

All other sections of Henrys Fork including Ashton and Island Park Reservoirs

Upper Snake Region general rules apply

Henrys Fork tributaries (except Warm River, Fall River, and Thurmon Creek)December 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Henrys LakeSection: Those portions of the lake within the posted boundaries of Staley Springs and within 100 yards of Hatchery Creek

Closed to fishing

Remainder of Henrys LakeFebruary 15 through Friday before Memorial Day Weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day Weekend through February 14

trout limit is 2, Brook Trout counted in the trout limit
Fishing must cease after the 2-trout daily bag limit has been retained

Henrys Lake Outlet December 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, only 2 may be Cutthroat Trout, no Cutthroat Trout under 16 inches

Henrys Lake tributariesJuly 1 through March 31

no harvest of Cutthroat Trout
Brook Trout limit is 25, only 2 Brook Trout over 16 inches

April 1 through June 30

closed to fishing

Hatchery Creek

closed to fishing

Horseshoe Lake (Fremont County) - no motors

Trout limit is 2

Jim Moore Pond

Trout limit is 2

Little Lost River and tributaries

Trout limit is 2
Long Lake (an alpine lake in Custer County)
Trout limit is 2, none under 20 inches

Market Lake Wildlife Management AreaMarch 1 through July 15

no boats, rafts or float tubes

McCoy Creek and tributaries

Trout limit is 6, no harvest of Cutthroat Trout

Medicine Lodge Creek and tributaries

Trout limit is 2, no harvest of Cutthroat Trout

Mud Lake (west of the posted boundary which runs north and south from McKenzie Point)March 1 through July 15

no boats, rafts or float tubes

Palisades Reservoir tributaries

Trout limit is 6, no harvest of Cutthroat Trout
No harvest of kokanee

Sand Creek Wildlife Management AreaDecember 1 through Friday before Memorial Day weekend

closed to fishing

Saturday of Memorial Day weekend through July 15

no boats, rafts or float tubes

Saturday of Memorial Day weekend through November 30

motorized watercraft prohibited
Additional closures to protect wildlife may be in effect. Call the Upper Snake Regional Office at 208-525-7290 for the latest information.

Silver Lake (Harriman State Park)

Closed to fishing

Snake River Section: Gem Lake Dam to Osgood Diversion Dam

Trout limit is 6, only 2 may be Cutthroat Trout

Section: Osgood Diversion Dam upstream to the confluence of Henrys Fork (North and South Fork)

Trout limit is 2, no harvest of Cutthroat Trout

South Fork Snake River

No harvest of Cutthroat Trout
Brown Trout limit is 2
No limit on Rainbow Trout or trout hybrids

South Fork Snake River tributaries

No harvest of Cutthroat Trout
No limit on Rainbow Trout or trout hybrids

June 1 through June 30

closed to fishing

Teardrop Lake (Snow Creek Pond)

Trout limit is 2

Teton River

No limit on Rainbow Trout or hybrids
No harvest of Cutthroat Trout

Teton River tributaries

No harvest of Cutthroat Trout
No limit on Rainbow Trout or hybrids

June 1 through June 30

closed to fishing

Thurmon Creek (Harriman State Park) Closed to fishingWarm River and tributariesSection: Within the posted boundaries from the state highway 47 bridge downstream (approx. 350 yards) to the next bridge near the mouth of Robinson Creek

Closed to fishing

All other sections of the Warm RiverDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release

Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Willow CreekDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release

Saturday of Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Willow Creek tributariesNo harvest of Cutthroat TroutNo limit on Rainbow Trout or hybridsJune 1 through June 30

closed to fishing

For more information please see https://idfg.idaho.gov/rules/fish (see Pages 35-36 for details)

Trout includes Brown Trout, Golden Trout, Lake Trout, Splake, Arctic Grayling, Cutthroat Trout, Rainbow Trout, and trout hy- brids (e.g. Tiger Trout)

• Trout limit is 6, all species combined

Does not include Bull Trout and Brook Trout which are listed separately

For more information please see https://idfg.idaho.gov/rules/fish

Oncorhynchus clarkii

Special Rule Waters for the Upper Snake Region

Beaver Creek and tributaries

Trout limit is 6, no harvest of Cutthroat Trout

Becker Pond (Ryder Park Pond)

2 fish any species

Big Lost River and tributariesDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release
whitefish limit is 0, catch-and-release

Saturday of Memorial Day weekend through November 30

trout limit is 6
whitefish limit is 0, catch-and-release

Dry Beds (Snake River)Section: From the Highway 48 bridge upstream to the Great Feeder irrigation diversion headgateMay 1 through March 31

Upper Snake Region general rules apply

April 1 through April 30

it is legal to take fish with dip nets, by snagging or by hand
Upper Snake Region bag limits apply

Fall River and tributaries

Limit is 2 trout, no harvest of Cutthroat Trout

Fish Creek (Harriman State Park)

Trout limit is 6, no harvest of Cutthroat Trout
Fly-fishing only

Golden Lake (Harriman State Park)

Closed to fishing

Henrys Fork (Snake River, North Fork) (see map on page 37) Section: South Fork Snake River/Henrys Fork confluence upstream to Vernon Bridge

Trout limit is 2, no harvest of Cutthroat Trout

Section: From Vernon Bridge upstream to Ashton DamDecember 1 through Friday before Memorial Day weekend

trout limit is 0
catch-and-release only

Saturday of Memorial Day weekend through November 30

trout limit is 2, no harvest of Cutthroat Trout

Section: From Highway 20 bridge upstream to the posted boundary upstream of Riverside Campground

Trout limit is 2, no harvest of Cutthroat Trout

Section: From the posted boundary upstream of the Riverside Campground upstream to the lower Harriman State Park boundary

Trout limit is 0, catch-and-release, no bait allowed, barbless hooks required

Section: From the lower Harriman State Park boundary upstream to the upper Harriman State Park boundary (Harriman Ranch)December 1 through June 14

closed to fishing

June 15 through November 30

trout limit is 0, catch-and-release, fly fishing only, barbless hooks required

Section: From the upper Harriman State Park boundary to Island Park Dam

Trout limit is 0, catch-and-release
No bait allowed, barbless hooks required

Section: From McCrea Bridge upstream to the Henrys Lake OutletDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, only 2 may be Cutthroat Trout, no Cutthroat Trout under 16 inches

Section: From Henrys Lake Outlet upstream to the head of Big Springs

Closed to fishing

All other sections of Henrys Fork including Ashton and Island Park Reservoirs

Upper Snake Region general rules apply

Henrys Fork tributaries (except Warm River, Fall River, and Thurmon Creek)December 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Henrys LakeSection: Those portions of the lake within the posted boundaries of Staley Springs and within 100 yards of Hatchery Creek

Closed to fishing

Remainder of Henrys LakeFebruary 15 through Friday before Memorial Day Weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day Weekend through February 14

trout limit is 2, Brook Trout counted in the trout limit
Fishing must cease after the 2-trout daily bag limit has been retained

Henrys Lake Outlet December 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and- release

Saturday of Memorial Day weekend through November 30

trout limit is 6, only 2 may be Cutthroat Trout, no Cutthroat Trout under 16 inches

Henrys Lake tributariesJuly 1 through March 31

no harvest of Cutthroat Trout
Brook Trout limit is 25, only 2 Brook Trout over 16 inches

April 1 through June 30

closed to fishing

Hatchery Creek

closed to fishing

Horseshoe Lake (Fremont County) - no motors

Trout limit is 2

Jim Moore Pond

Trout limit is 2

Little Lost River and tributaries

Trout limit is 2
Long Lake (an alpine lake in Custer County)
Trout limit is 2, none under 20 inches

Market Lake Wildlife Management AreaMarch 1 through July 15

no boats, rafts or float tubes

McCoy Creek and tributaries

Trout limit is 6, no harvest of Cutthroat Trout

Medicine Lodge Creek and tributaries

Trout limit is 2, no harvest of Cutthroat Trout

Mud Lake (west of the posted boundary which runs north and south from McKenzie Point)March 1 through July 15

no boats, rafts or float tubes

Palisades Reservoir tributaries

Trout limit is 6, no harvest of Cutthroat Trout
No harvest of kokanee

Sand Creek Wildlife Management AreaDecember 1 through Friday before Memorial Day weekend

closed to fishing

Saturday of Memorial Day weekend through July 15

no boats, rafts or float tubes

Saturday of Memorial Day weekend through November 30

motorized watercraft prohibited
Additional closures to protect wildlife may be in effect. Call the Upper Snake Regional Office at 208-525-7290 for the latest information.

Silver Lake (Harriman State Park)

Closed to fishing

Snake River Section: Gem Lake Dam to Osgood Diversion Dam

Trout limit is 6, only 2 may be Cutthroat Trout

Section: Osgood Diversion Dam upstream to the confluence of Henrys Fork (North and South Fork)

Trout limit is 2, no harvest of Cutthroat Trout

South Fork Snake River

No harvest of Cutthroat Trout
Brown Trout limit is 2
No limit on Rainbow Trout or trout hybrids

South Fork Snake River tributaries

No harvest of Cutthroat Trout
No limit on Rainbow Trout or trout hybrids

June 1 through June 30

closed to fishing

Teardrop Lake (Snow Creek Pond)

Trout limit is 2

Teton River

No limit on Rainbow Trout or hybrids
No harvest of Cutthroat Trout

Teton River tributaries

No harvest of Cutthroat Trout
No limit on Rainbow Trout or hybrids

June 1 through June 30

closed to fishing

Closed to fishing

All other sections of the Warm RiverDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release

Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Willow CreekDecember 1 through Friday before Memorial Day weekend

trout limit is 0, catch-and-release

Saturday of Memorial Day weekend through November 30

trout limit is 6, no harvest of Cutthroat Trout

Willow Creek tributariesNo harvest of Cutthroat TroutNo limit on Rainbow Trout or hybridsJune 1 through June 30

closed to fishing

For more information please see https://idfg.idaho.gov/rules/fish (see Pages 35-36 for details)

Regulations for

43°23′47.4″N 111°16′19.6″W

Regulations in the map

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FAQ about Irwin fishing

Anglers in Irwin, ID recommend these top fishing spots: Snake River (Palisades Res. - American Falls Res.), Snake River, Palisades Reservoir, Trail Creek Pond, and Big Elk Creek.

Most commonly caught species around Irwin, ID:

Cutthroat trout - 534 reported catches
Rainbow trout - 334 reported catches
Brown trout - 259 reported catches
Smallmouth bass - 142 reported catches
Brook trout - 77 reported catches

The latest Irwin, ID fishing reports are:

@kaitlin.weaver reported a nice Largescale sucker at Snake River (Palisades Res. - American Falls Res.).
@GarrisonPinn reported a nice Smallmouth bass.
@Rymerr85 reported a nice Brown trout.
@brytonlarson reported a nice Largescale sucker.
@deaconsaulters reported a nice Cutthroat trout at Teton River.

Download the and see today's Fishing and Weather Forecast for Irwin, ID. We give you weather trends and help you find the perfect window to catch your next personal best. With Fishbrain Pro, you will get the following capabilities: