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.
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.
Open Sat of Mem Day wknd — First Sun in Nov
YNP fishing permit. Opens with park general season. Native cutthroat C&R
Forecast and on-page guide updated June 22, 2026 (UTC). Open the app for hourly conditions.
Today's Fishing Conditions
Fair
Updated 3:44 AM
51°F
2020 CFS
1 PM - 3 PM
Serendipity
Free forever • No signup required • Hourly updates
Quick Facts
Yellowstone Cutthroat Trout and Rainbow Trout
freestone
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
Recommended Tactics
PRIME MONTH. Salmonfly and stonefly hatches.
June Hatches
BWO
Mayfly
Spring and fall BWO activity. Overcast days prime.
PMD
Mayfly
Summer mayfly emergence. Morning activity.
Salmonfly
Stonefly
Limited salmonfly activity. Lower sections best.
Mother's Day Caddis
Caddis
Early season caddis. Park opens Memorial Day weekend.
Caddis
Caddis
Evening caddis activity through summer.
Year-Round Fishing Guide
| Month | Water Temp | Tactics |
|---|---|---|
| January | 32-38°F | Deep nymphing, Midges, Streamers |
| February | 33-40°F | Midges, Small nymphs, Deep pools |
| March | 36-45°F | BWO dries, Streamers, Early stonefly nymphs |
| April | 40-50°F | Skwala dries, BWO patterns, Streamers |
| May | 45-55°F | Mother's Day Caddis, Nymphing, Streamers |
| June(Now) | 50-60°F | Salmonfly dries, Golden Stones, PMDs |
| July | 55-68°F | PMDs, Hoppers, Caddis, Attractor dries |
| August | 55-70°F | Hoppers, Tricos, PMDs, Terrestrials |
| September | 48-58°F | BWOs, Streamers, Hoppers |
| October | 40-50°F | Streamers, BWOs, Egg patterns |
| November | 35-42°F | Streamers, Deep nymphs, Egg patterns |
| December | 32-38°F | Deep 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.
Soda Butte
Tributary confluence access.
Slough Creek
Famous tributary access.
Tower Junction
Lower river access.
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
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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