Freestone · Limestone Influenced · Pennsylvania

Penns Creek

Penns Creek venue image

Pennsylvania's most famous wild-trout river and the home of the Green Drake circus — for a week or two at the turn of May into June, Ephemera guttulata hatches in numbers that draw anglers from across the country, and the big browns lose their heads over the duns and the Coffin Fly spinner fall.

Marginal · Brown Trout
Slate Drake · 10-14
Marginallive now
Slow going — pick your moments
River temperature is the limiting factor today, not the flow. Fish dawn or dusk if you go at all, and handle everything with extra care.
80% confidence
What moved it
  • Level0.50 mLast reading 13h ago
  • Water temp19.2°C
  • ClarityClear
Today's fly
SD
Slate Drake10-14
Proven pattern for this period
Conditions on the water
Live gauge
Level
Steady
0.50 m
Last reading 13h ago
Water temp19.2°C
ClarityClear
Weather21°C
WindSW 15 km/h
Pressure1014 hPa
Rain · recent0.0 mm
Rain · ahead0.0 mm

Live readings — water temperature is an estimate where the gauge does not record it.

Water temperature for Brown Trout
Warm — slow
19°C est.ideal 1016°C
0°14°28°
How to fish it · for Brown 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 19.2°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 5 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 2 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
Quill GordonHatch
2
2
Blue QuillHatch
2
3
2
HendricksonHatch
2
2
Eastern March BrownHatch
2
2

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

Ranked for today
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • Class A wild and C&R fly-only special-reg sections
What's coming
Plan ahead
5-day outlook
Water here around 19°C. Nothing cooler within range — carry a thermometer.
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

Pennsylvania's most famous wild-trout river and the home of the Green Drake circus — for a week or two at the turn of May into June, Ephemera guttulata hatches in numbers that draw anglers from across the country, and the big browns lose their heads over the duns and the Coffin Fly spinner fall. The rest of the year it's a superb, big, walk-in limestoner freestone with sulphurs, slate drakes and serious streamer water.

Under the surface

Penns Creek rises from the great limestone spring at Penns Cave in central Pennsylvania and runs down through a wooded valley as the state's most famous wild-trout river — limestone-fertile up top, freestone-wild as it tumbles into its forested lower gorge below Coburn. It is best known for one thing: the Green Drake, the giant mayfly whose hatch and spinner fall each late May draws fishermen from half the country and turns the river, for a week or two, into a circus of big rising browns and frustrated anglers. The bed is limestone-and-sandstone cobble and ledge; the water is clear, the lower river boulder-strewn and remote where the rattlesnakes outnumber the road crossings. Wading is rocky freestone work, slick in the gorge. Penns is a river of two characters — fertile spring creek and wild mountain freestone — and it rewards the angler who understands which one he's standing in.

Wading: Slick boulders in the remote lower gorge

  • Limestone influenced
  • Partly confined
  • Pool riffle
  • Step pool
Water quality · US Clean Water Act
  • Aquatic lifeSupporting
What this classification means

EPA ATTAINS assessment unit 'Penns Creek-54966927' (PA-SCR-54966927), 2024 Integrated Report. Aquatic Life use: Fully Supporting. 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-54966927

The full read · show the working · for Brown Trout · confidence 80%
How the 33 is built — score × weight = contribution
Temperature36 × 28%10.1
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity67 × 12%8.0
Conditions total= 66
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowon-river gaugeobserved
Prey activitymodelled from regional profilemodelled
What would change the calculation
Cooler water — back toward the 10–16 °C ideal band — would lift the score and ease welfare.
The dawn and dusk windows score higher than the midday lull.
Directions
Seasons & zones
  • Trout1 January31 December
Related guides
Booking & contacts