Tailwater · Sandstone Shale · New York

Upper Main Stem Delaware River

Upper Main Stem Delaware River terrain map
Marginal · Rainbow Trout
Trico Spinner · 20-24
Marginallive now
Slow going — pick your moments
River high but settled. Slow going — pick your moments and do not force it.
90% confidence
What moved it
  • Level1.87 mLast reading 16h ago
  • Water temp18.5°C
  • ClarityClear
Today's fly
TS
Trico Spinner20-24
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
1.87 m
Last reading 16h ago
Water temp18.5°C
ClarityClear
Weather21°C
WindSW 15 km/h
Pressure1012 hPa
Rain · recent2.5 mm
Rain · ahead0.0 mm

Live readings only. Trends shown where the gauge supports them.

Water temperature for Rainbow Trout
Warm — slow
18.5°Cideal 1018°C
0°14°28°
How to fish it · for Rainbow Trout
When
Nymphing can work through most of the day.
Where
Cover mixed depths.
Method
Start with tight-line nymphs and adjust if fish rise or drift higher.
Kit
9 ft #4 rod, floating line, 12 ft tapered leader to 4–5 lb fluoro tippet.
Why this works
Water at 18.5°C — above the brown trout caution line (18°C). Fish dawn or dusk only. Land it fast, wet hands, no air shots.
Hatch timeline · todayPeak at 6am

Hatch predictions

Today's headline hatch shown — see all 4 active hatches hour by hour with Pro.

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Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

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Beyond the hatch · worth watchingambient prey

Hatch predictions

Top prey shown — see all 3 with Pro.

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Evidence
ModelledModerate confidence

Modelled from regional ecology — no survey or occurrence data for this water yet.

Through the year
0–3 scale · July highlighted
J
F
M
A
M
J
J
A
S
O
N
D
Trout seasonSeason
1
2
2
2
2
2
2
2
2
2
2
1
SulphurHatch
2
3
2
Trico (Eastern)Hatch
2
3
3
2
Eastern Blue-Winged OliveHatch
2
3
3
3
3
3
3
3
2
Eastern Summer BWO (Drunella)Hatch
2
3
3
2

Numbers are intensity 0 (none) to 3 (peak) — a guide, not a guarantee.

Ranked for today
Rainbow Trout fly box
Local fly shops: Dette Flies·Beaverkill Angler
Beats · 3 · 1 reaches

The main stem is big NY/PA border water below Hancock — a New York or Pennsylvania license is valid, with the Delaware border-water trout regulation (April 1–Oct 15, one trout daily; Oct 16–Mar 31 catch-and-release, artificial lures only). It runs through the Upper Delaware Scenic and Recreational River corridor, with NPS and NY/PA public access points, but much of the frontage is private and the river has deceptively fast water, steep drop-offs and cold-water hazards — this is mostly a drift-boat river. The hard truth in summer is temperature: the main stem can be too warm for trout even when the flow looks perfect, so the cold branch releases at Hancock are the refuge, and the lower reaches become a smallmouth fishery in the heat. Confirm current NY DEC / PA FBC regulations before you go.

Main Stem · 3 beatsDay rods
Hancock to Lordville, Lordville to Callicoon, Callicoon to Narrowsburg
The 3 beats
Hancock to LordvillePublic
NY/PA border water — NPS corridor, NY DEC / PA FBC
The upper main stem just below the Hancock junction — buffered cold by the two branch releases and the strongest wild-trout reach of the big water, excellent in the right thermal window. A drift-boat river with NPS and public access points; the bank is largely private.
Border water — NY or PA license valid; Delaware border-water trout regulation applies. Strong water-temperature override: trout fishing collapses as it warms, and fish stack at the cold branch confluences — fish the refuge, don't crowd it. Fast, hazardous big water; public water does not mean public bank.
Lordville to CallicoonPublic
NY/PA border water — NPS corridor, NY DEC / PA FBC
Big-water trout in the wild-trout-to-smallmouth transition — excellent in spring and the cool shoulders, but the summer heat risk climbs as you go downstream. A drift-boat reach through the scenic corridor with public access points and mostly private frontage.
Border water with the Delaware trout regulation. Thermal risk rises downstream — trout fishing becomes a temperature question and the reach turns toward smallmouth in the heat. Fast big water; public water, private bank between access points.
Callicoon to NarrowsburgPublic
NY/PA border water — NPS corridor, NY DEC / PA FBC
The warmer lower reach of the upper Delaware — primarily a smallmouth-bass fishery through much of the season, with trout only a realistic target when the water stays cool. Public boat ramps and access through the scenic corridor; treat trout here as conditional, not the headline.
Border water; the Delaware trout regulation still applies, but this reach warms enough that it's smallmouth-dominated in summer — surfaced as informational for trout, not a trout recommendation in the heat. Fast big water with cold-water and current hazards; public water, private bank between access points.
Permits & access
Permit required — see local rules.
  • NY/PA border tailwater-fed main stem
What's coming
Plan ahead
5-day outlook
Cooler water nearby · 1
Water here at 18.5°C — the fishing's alive, but these are cooler if you'd rather rest the warm water.
Water quality · US Clean Water Act
  • Aquatic lifeNot assessed
  • Fish consumptionImpaired
What this classification means

Fish consumption: Consumption advisory (Mercury) — fish for sport, not the table.

EPA ATTAINS assessment unit 'Delaware River-25868582' (PA-SCR-25868582), 2024 Integrated Report. Aquatic Life use: not assessed. Listed impairment causes: Mercury. This is a Clean Water Act assessment-unit classification (the US analogue of WFD), not a live reading.

Status is for the Clean Water Act assessment unit covering this reach.

EPA ATTAINS (Clean Water Act) · PA-SCR-25868582

The full read · show the working · for Rainbow Trout · confidence 90%
How the 37 is built — score × weight = contribution
Temperature84 × 28%23.5
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time65 × 13%8.5
Pressure75 × 7%5.3
Insect activity68 × 12%8.2
Conditions total= 78
Can you trust it?
Water temperaturelive gauge readinggauge
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout1 January31 December
Related guides
Booking & contacts