San Juan Fishing Forecast
The San Juan in New Mexico behaves like a classic tailwater: cold, predictable releases that stretch the trout season when freestone neighbors run warm or muddy. Anglers target rainbow trout and brown trout across riffles, seams, and undercut banks in this region, with prime dry-fly and nymph windows typically clustering in March through November. USGS gauge 08379500 tracks live flow and temperature for planning wade or float days. Local tactics angle: The San Juan River below Navajo Dam is one of the finest tailwaters in the United States, producing trophy rainbow trout in incredible numbers. Fish counts exceed 15,000 trout per mile. TroutFishing pairs hatch timing with solunar windows so you know when to be on the water—not just where.
Local Knowledge: San Juan
Based on local angler reports · New Mexico · always verify before traveling
A regional note specific to this water: the river's most productive hatches are the ones you read about in books, but the most productive days are the ones you read about in your notebook, and the notebook is the only book that knows the river, and the river is the only river that knows the notebook, and the notebook is the fish the river gives back to those who keep a notebook about the river. the river's most productive hatches are the ones that match the weather, and the weather is the weather the river knows, and the river knows the weather better than the forecast, and the forecast is not the river, and the river is not the forecast, and the fish are not the fish you read about in the magazines. The Provo River in north-central Utah is a tailwater that emerges from the bottom of Jordanelle Reservoir, and the most famous tailwater in the state. The river leaves Jordanelle Reservoir as a constant-temperature discharge, and the water temperature is between 48 and 60 degrees year-round. A guide's private notes: The most popular access is the parking lot at the base of the Jordanelle 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 productive that even the most-pressured runs produce fish on any given day. The river is famous for its midge hatches, which run year-round in the constant-temperature water, and the most productive fly is a size 24-28 Midge Emerger fished on a long 7X leader. Most of the fish you will catch in a lifetime on this river will come from water you walk past the first time; the river does not give up its secrets to the impatient. The river is also famous for its brown and rainbow trout, and the average size is in the sixteen to twenty inch range. The most famous local fly shop is the Provo River Anglers in Midway, and the owner's advice is consistent: fish early, fish small, and stay out of the water when the wind is blowing. angler code 174d587c-373df110. The most productive flies are 4-6 Hare's Ear for the morning mayfly hatch, 12-14 Sparkle Dun for the late summer hopper-dropper, and a Girdle Bug 10-12 a Sculpin for the larger spring fish. The river's personality is one of low-pressure wildness — the fish are wild, the water is clear, and the experience is more like fishing a secret than fishing a river. Stay in Midway or Heber City, eat at the Heber Cafe, and fish the river in two sections — the tailwater below the dam and the lower river above the confluence with the Deer Creek Reservoir. The river's most productive anglers are the ones who do not need to catch a fish; the fish are more willing to be caught by those who do not need them, and the river knows the difference. A 9-foot rod, 4X tippet, and one dry fly is all you need on most days; the river does not reward overcomplicated rigs. The San Juan River in northwestern New Mexico is a tailwater that emerges from the bottom of Navajo Reservoir, and the most productive trout river in the state. The river leaves Navajo Reservoir as a constant-temperature discharge, and the water temperature is between 48 and 60 degrees year-round. Reading between the lines: The most popular access is the parking lot at the base of the Navajo Dam, where the U.S. The river has been fished the same way for a hundred years because the way works; you do not need to reinvent it, you need to learn it. The most famous local fly shop is the San Juan River Anglers in Navajo Dam, and the owner's advice is consistent: fish early, fish small, and stay out of the water when the wind is blowing. angler code 426f7eb3-299b1a61. The most productive flies are 20-22 Zebra Midge for the evening caddis hatch, 14-16 Miracle Nymph for the spring salmonfly hatch, and a Crayfish 8-10 a Leech for the larger wild fish. The river's personality is one of slow, deliberate work — there is no fast water, no big rapids, and no big runs; the river is a long walk through quiet meadow, and the fish are in the slow pools. Stay in Navajo Dam or Bloomfield, eat at the Three Rivers Eatery, and fish the river in two sections — the tailwater below the dam and the lower river above the confluence with the Animas River. Treat it well and it will treat you well; treat it poorly and it will not; the river is honest, and the honest fish are the ones you want to catch. If you can read a river, you can fish any river; if you can fish one river well, you can fish them all.
Constant 69°F water flows through the San Juan at 1 CFS CFS — 5/10 today. Top pick: a Parachute Hopper.
Open year-round
Quality Waters below Navajo Dam. Year-round. Barbless hooks required in Quality Waters section. One trout over 20in
Forecast and on-page guide updated June 21, 2026 (UTC). Open the app for hourly conditions.
Today's Fishing Conditions
Fair
Updated 10:39 PM
69°F
1 CFS
12 PM - 2 PM
Parachute Hopper
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Quick Facts
Rainbow Trout and Brown Trout
tailwater
54°F - 64°F
What Makes the San Juan Unique?
Signature hatch or window
Salmonfly (Stonefly) is a headline hatch to watch in June. Peak activity often tracks 48–58°F water temps.
Distinctive access
Texas Hole: Famous pool below Navajo Dam.
Rules anglers miss
Quality Waters has strict regulations.
June Fishing Tactics
Primary Targets
Recommended Tactics
Prime dry fly season. Evening hatches can be spectacular.
June Hatches
Salmonfly
Stonefly
Giant stonefly hatch, moves upstream as water warms above 52F
Golden Stone
Stonefly
Follows salmonfly hatch, active during midday
PMD
Mayfly
Pale Morning Duns, morning hatches on sunny days
Green Drake
Mayfly
Large mayfly, best on cloudy humid days
Caddis
Caddis
Evening caddis hatches prolific through summer
Scud
Crustacean
Year-round tailwater food source
Year-Round Fishing Guide
| Month | Water Temp | Tactics |
|---|---|---|
| January | 32-38°F | Nymphing, Midges, Small Streamers |
| February | 32-40°F | Nymphing, Midges, Small Streamers |
| March | 36-46°F | Dry Flies, BWOs, Skwala |
| April | 42-52°F | Dry Flies, BWOs, Skwala |
| May | 48-58°F | Dry Flies, BWOs, Skwala |
| June(Now) | 54-64°F | Hoppers, Terrestrials, PMDs |
| July | 58-68°F | Hoppers, Terrestrials, PMDs |
| August | 60-70°F | Hoppers, Terrestrials, PMDs |
| September | 54-64°F | Streamers, BWOs, October Caddis |
| October | 46-56°F | Streamers, BWOs, October Caddis |
| November | 38-46°F | Streamers, BWOs, October Caddis |
| December | 32-40°F | Nymphing, Midges, Small Streamers |
Spawning Seasons
Please respect spawning fish and their redds. Avoid fishing over actively spawning trout.
Brown Trout
Spawn months: October, November
Night spawning common. Males become very dark with pronounced kype during spawn.
Rainbow Trout
Spawn months: March, April
Resident rainbow trout spawn in smaller tributaries and tend to build smaller redds than steelhead.
Access Points & Parking for San Juan
Texas Hole
Famous pool below Navajo Dam.
Kiddie Hole
Quality fishing access.
Upper Flats
Technical fishing in flats.
Baetis Bend
Famous for BWO hatches.
How to Fish San Juan: Tips & Tactics
The San Juan River below Navajo Dam is one of the finest tailwaters in the United States, producing trophy rainbow trout in incredible numbers. Fish counts exceed 15,000 trout per mile.
Best Times of Day
Year-round fishing is excellent. Midge and BWO hatches occur daily. Morning hours offer the best surface activity.
Recommended Techniques
Match the prolific midge and mayfly hatches. Sight fishing to specific trout is highly productive. Fine tippets and small flies essential.
Water Conditions
Cold dam releases create exceptional conditions. Water clarity is excellent. Fish are numerous but can be selective.
Fly Selection
Midge patterns in sizes 20-26 essential. BWO patterns for mayflies. San Juan Worms work year-round.
Local Knowledge
The "Quality Waters" section below the dam is the premier fishing. Fish counts are among the highest in the country. The desert setting is beautiful.
Local Tips
Navajo Dam is the destination. The San Juan is among the finest tailwaters anywhere. Expect technical fishing with numerous fish.
When is the Best Time to Fish San Juan?
Spring
Excellent fishing continues. BWO hatches increase.
Summer
Year-round tailwater stays cool. Fish early morning.
Fall
Outstanding conditions. Less crowded.
Winter
Cold water fishery produces. Midge focus.
Recommended Equipment for San Juan
Rod
9-foot, 4 or 5-weight for technical fishing.
Line
Floating line with long leaders.
Leader & Tippet
12-15 foot leaders, 6X-7X tippet.
Waders
Breathable waders. Cold water year-round.
Essential Flies
San Juan Fishing Regulations
Season
Open year-round.
Limits
One fish over 20 inches in Quality Waters.
Special Regulations
Quality Waters has strict regulations.
Bait Restrictions
Single barbless flies only in Quality Waters.
Notes
New Mexico Game and Fish manages this trophy water.
Always verify current regulations with New Mexico fish and wildlife agency before fishing. Regulations can change annually.
Fly Shops & Guides Near San Juan
Local Fly Shops
- Abe's Motel & Fly Shop - Navajo Dam
- Rizuto's Fly Shop
- San Juan River Lodge
Guide Services
- San Juan River Lodge Guides
- Abe's Guide Service
- Rizuto's Guides
Optimal Fishing Conditions
Optimal Flow
500 - 2500 CFS
Best fishing conditions
Optimal Water Temperature
42° - 55°F
Ideal for active trout
Other Rivers You Might Like
Popular forecasts outside New Mexico—great for trip planning and comparing conditions.
San Juan — frequently asked questions
When is the best time to fish the San Juan?
Prime dry fly season. Evening hatches can be spectacular.
What flies should I bring to the San Juan?
For the San Juan (tailwater), carry: Midge, RS2, San Juan Worm, BWO, Annelid.
What water temperature is best for trout on the San Juan?
On the San Juan, trout hold between 42° and 55°F. Because the river is dam-fed, the temperature stays in this band year-round.
Do I need a fishing license for the San Juan?
Yes — you need a valid New Mexico fishing license to fish the San Juan. Local season: Open year-round.. Daily limit: One fish over 20 inches in Quality Waters..
What hatches should I watch for on the San Juan in June?
Salmonfly is the signature hatch on the San Juan 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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