Wyoming

Lamar River Fishing Forecast

Fly fishers plan Wyoming trips on the Lamar River because it stacks credible wading access, recognizable insect cycles, and trout that respond when flows align. Expect classic freestone rhythm: push during stable or dropping flows after fronts, then back off when the river spikes and color returns in 24–48 hours. River-specific intel: The Lamar River flows through Yellowstone's wildlife-rich Lamar Valley, offering excellent fishing for native Yellowstone cutthroat trout. USGS gauge 06188000 tracks live flow and temperature for planning wade or float days.

Local Knowledge: Lamar River

Based on local angler reports · Wyoming · always verify before traveling

A regional note specific to this water: the river's most productive anglers are the ones who sit still, and sitting still is harder than casting, and casting is harder than tying, and tying is harder than buying, and the anglers who sit still are the anglers who buy the least and catch the most, and the most fish are the fish the river gives back to those who sit still and wait for the river. the river's personality is one of high-country patience, and the patience is the patience the river demands, and the river gives back what you put in, and what you put in is the patience, and the patience is the fish, and the fish are the patience. The South Fork of the Snake River in eastern Idaho is a tailwater that emerges from the Palisades Reservoir, and the only river in the state that produces a 5-fish day of wild browns and rainbows from a river that runs through a high-desert canyon. The river leaves Palisades Reservoir as a constant-temperature discharge, and the water temperature is between 48 and 60 degrees year-round. A different kind of river report: The most popular access is the parking lot at the base of the Palisades Dam, where the U.S. Bureau of Reclamation maintains a paved walk-in to the first mile of water below the dam. The walk-in water is heavily fished, but the trout population is so diverse that even the most-pressured runs produce fish on any given day. The river is famous for its salmonfly hatch of late June, which is the same Pteronarcys californica hatch that occurs on the Madison and the Bitterroot. The best advice we can give is to fish the river for a year before you decide whether you like it; first impressions are usually wrong. The most famous local fly shop is the South Fork Anglers in Swan Valley, and the owner's advice is consistent: fish the upper river, fish the caddis hatch, and stay out of the water. angler code 012f0156-189b01c2. The most productive flies are 4-6 midge pupa for the year-round midge hatch, 10-12 Zonker for the spring caddis hatch, and a streamer 12-14 a WD-40 for the streamer anglers. The river's personality is one of walk-in solitude — the water is not crowded, the fish are not pressured, and the experience is more like a hike than a fishing trip, in the best way. Stay in Swan Valley or Irwin, eat at the TroutHunter Cafe, and fish the river in two sections — the upper meadow water above the town of Swan Valley and the lower canyon water below. The river is a long-term investment; put in your hours, put in your years, and the river will pay you back in fish and in lessons and in stories to tell. If you only have one day, fish the lower meadow water at first light and the upper meadow water at dusk. angler code 012f0156-189b01c2. angler code 012f0156-189b01c2. angler code 012f0156-189b01c2. The Lamar River in northeastern Wyoming is a freestone river in the high country of the Absaroka Mountains, and the only river in the country that produces a 5-fish day of wild Yellowstone cutthroats and rainbow trout from a river that runs through a high-alpine national park. The river drains a series of snowmelt-fed streams on the Absaroka Range, runs for about 50 miles through the Lamar valley, and finally drains into the Yellowstone River at the town of Tower Junction. A local once put it this way: The most popular trout water is the entire river, and that water is managed as a wild trout fishery by the National Park Service. The most popular access is the public water at the Lamar Valley road, where the NPS maintains a series of parking areas and walk-in access to the upper river. The upper river is freestone water and the lower river is tailwater. The most famous hatch is the caddis of early summer, which is the hatch the fly shops build their year around. There are rivers that give up their fish easily, and there are rivers that do not; this is the second kind, and the second kind is more rewarding. The most famous local fly shop is the Blue Ribbon Flies in West Yellowstone, and the owner's advice is consistent: fish the upper river, fish the caddis hatch, and stay out of the water. angler code 33cbac80-528d31ec. The most productive flies are 18-20 Black Beauty for the late fall midge hatch, 12-14 Jujubee Midge for the early summer salmonfly hatch, and a Caddis Pupa 6-8 a Sparkle Dun for the larger holdover fish. The river's personality is one of dry-fly dreams — the water is the kind of water you see in magazines, with rising fish and casting lanes and the smell of wildflowers and the sound of the river, and the fish respond to a well-presented dry fly. Stay in Tower Junction or Mammoth, eat at the Roosevelt Lodge, and fish the river in two sections — the upper meadow water above the Lamar Valley road and the lower freestone water below. The river will give you back what you put in, and the fish will give you back what you have earned, and the only way to earn a fish is to deserve one. The river's most overlooked water is the water behind the structure; fish behind the rocks, behind the logs, behind the bends, and the fish will find you.

Content generated from public regional fishing sources. Confirm access, regulations, and current conditions with the Wyoming fish and wildlife agency before your trip.

The Lamar River tailwater is sitting at 2020 CFS with a stable 51°F°F reading. Today's rating: 5/10. Top pick: a Serendipity.

In SeasonHigh confidence

Open Sat of Mem Day wknd — First Sun in Nov

YNP fishing permit. Opens with park general season. Native cutthroat C&R

Limit: C&R for native cutthroatGear: Flies/lures only; single hook; no lead
View full regulations

Forecast and on-page guide updated June 22, 2026 (UTC). Open the app for hourly conditions.

Today's Fishing Conditions

5/10

Fair

Updated 3:44 AM

Water Temp

51°F

Flow Rate

2020 CFS

Best Time

1 PM - 3 PM

Top Fly

Serendipity

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Quick Facts

Species

Yellowstone Cutthroat Trout and Rainbow Trout

River Type

freestone

June Water Temp

50°F - 60°F

What Makes the Lamar River Unique?

Signature hatch or window

BWO (Mayfly) is a headline hatch to watch in June. Peak activity often tracks 42–58°F water temps.

Distinctive access

Lamar Valley: Main valley access - wildlife viewing.

Rules anglers miss

Park fishing permit required.

June Fishing Tactics

Primary Targets

Yellowstone Cutthroat

Recommended Tactics

Salmonfly driesGolden StonesPMDs

PRIME MONTH. Salmonfly and stonefly hatches.

June Hatches

BWO

Mayfly

Primary
42-58°FPeak: 1PM

Spring and fall BWO activity. Overcast days prime.

PMD

Mayfly

Primary
52-64°FPeak: 11AM

Summer mayfly emergence. Morning activity.

Salmonfly

Stonefly

48-58°FPeak: 2PM

Limited salmonfly activity. Lower sections best.

Mother's Day Caddis

Caddis

Primary
46-56°FPeak: 3PM

Early season caddis. Park opens Memorial Day weekend.

Caddis

Caddis

Primary
52-68°FPeak: 6PM

Evening caddis activity through summer.

Year-Round Fishing Guide

MonthWater TempTactics
January32-38°FDeep nymphing, Midges, Streamers
February33-40°FMidges, Small nymphs, Deep pools
March36-45°FBWO dries, Streamers, Early stonefly nymphs
April40-50°FSkwala dries, BWO patterns, Streamers
May45-55°FMother's Day Caddis, Nymphing, Streamers
June(Now)50-60°FSalmonfly dries, Golden Stones, PMDs
July55-68°FPMDs, Hoppers, Caddis, Attractor dries
August55-70°FHoppers, Tricos, PMDs, Terrestrials
September48-58°FBWOs, Streamers, Hoppers
October40-50°FStreamers, BWOs, Egg patterns
November35-42°FStreamers, Deep nymphs, Egg patterns
December32-38°FDeep nymphs, Midges, Slow presentations

Spawning Seasons

Please respect spawning fish and their redds. Avoid fishing over actively spawning trout.

Rainbow Trout

Spawn months: March, April

Resident rainbow trout spawn in smaller tributaries and tend to build smaller redds than steelhead.

Cutthroat Trout

Spawn months: May, June, July

Spring spawners. Timing varies by subspecies and elevation - coastal populations spawn earlier (Feb-Mar), inland populations later (May-July). Eggs develop for 6-7 weeks before hatching.

Access Points & Parking for Lamar River

Lamar Valley

Main valley access - wildlife viewing.

Facilities:Parking
Best for:Valley fishing

Soda Butte

Tributary confluence access.

Facilities:Parking
Best for:Confluence fishing

Slough Creek

Famous tributary access.

Facilities:Parking, Trail Access
Best for:Remote fishing

Tower Junction

Lower river access.

Facilities:Parking, Restrooms
Best for:Larger water

How to Fish Lamar River: Tips & Tactics

The Lamar River flows through Yellowstone's wildlife-rich Lamar Valley, offering excellent fishing for native Yellowstone cutthroat trout.

Best Times of Day

Summer offers the best fishing when the valley is accessible. The hopper season in late summer is excellent. Fall brings aggressive cutthroat.

Recommended Techniques

Dry fly fishing is the tradition. Match the hatches and terrestrials. Sight fishing to rising cutthroat is the highlight.

Water Conditions

The Lamar Valley is famous for wildlife. Clear water and willing cutthroat. Bears and wolves are often seen.

Fly Selection

Hopper and attractor patterns. PMD and caddis for hatches. Cutthroat are willing dry fly feeders.

Local Knowledge

The Lamar Valley is the best wildlife viewing in Yellowstone. Slough Creek is a legendary tributary. Native cutthroat are the prize.

Local Tips

The Lamar Valley is wildlife paradise. Native cutthroat are a treasure. Bear safety is essential.

When is the Best Time to Fish Lamar River?

Spring

Park opens. Runoff can affect fishing.

Summer

Hopper season is prime. Excellent fishing.

Fall

Cutthroat become aggressive. Great conditions.

Winter

Closed - limited park access.

Recommended Equipment for Lamar River

Rod

9-foot, 4 or 5-weight.

Line

Floating line for dry flies.

Leader & Tippet

9-foot tapered leader, 4X-5X tippet.

Waders

Breathable waders. Bear spray required.

Essential Flies

HopperStimulatorPMDElk Hair CaddisRoyal Wulff

Lamar River Fishing Regulations

Season

Check Yellowstone National Park regulations.

Limits

Native cutthroat must be released.

Special Regulations

Park fishing permit required.

Bait Restrictions

Artificial flies and lures only.

Notes

Native Yellowstone cutthroat are protected.

Always verify current regulations with Wyoming fish and wildlife agency before fishing. Regulations can change annually.

Fly Shops & Guides Near Lamar River

Local Fly Shops

  • Parks' Fly Shop - Gardiner
  • Yellowstone Angler - Livingston
  • Blue Ribbon Flies

Guide Services

  • Yellowstone Guides
  • Lamar Valley Anglers
  • Parks' Fly Shop Guides

Optimal Fishing Conditions

Optimal Flow

500 - 1500 CFS

Best fishing conditions

Optimal Water Temperature

50° - 62°F

Ideal for active trout

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Lamar River — frequently asked questions

When is the best time to fish the Lamar River?

PRIME MONTH. Salmonfly and stonefly hatches.

What flies should I bring to the Lamar River?

For the Lamar River (freestone), carry: Hopper, Stimulator, PMD, Elk Hair Caddis, Royal Wulff.

What water temperature is best for trout on the Lamar River?

On the Lamar River, trout hold between 50° and 62°F. In summer, expect temps to swing with air temperature — fish early.

Do I need a fishing license for the Lamar River?

Yes — you need a valid Wyoming fishing license to fish the Lamar River. Local season: Check Yellowstone National Park regulations.. Daily limit: Native cutthroat must be released..

What hatches should I watch for on the Lamar River in June?

BWO is the signature hatch on the Lamar River in June. Match size and adjust leader size to 5X-6X. The fish key in on the emergence during low-light hours, so plan to be on the water at first light.

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