Spring Creek · Limestone · Pennsylvania, US

Falling Spring Branch

Falling Spring Branch venue image

A jewel-box limestoner famous for its trico hatch — clouds of tiny spinners on August mornings over wild browns sipping in flat, clear water.

Prime · Brown Trout
Blue Winged Olive · 18-22
Primelive now
About as good as it gets
River steady at a fishable height. On the feed top to bottom — start on the rises with a dry, drop a nymph if they stay down.
90% confidence
What moved it
  • LevelProxyvia Spring Creek
  • Water temp13.7°C
  • ClarityClear
Today's fly
Blue Winged Olive
Blue Winged Olive18-22
Proven pattern for this period
Conditions on the water
Proxy gauge
Level
Steady
Proxy
via Spring Creek
Water temp13.7°C
ClarityClear
Weather9°C
WindN 24 km/h
Pressure1023 hPa
Rain · recent0.8 mm
Rain · ahead0.0 mm

No gauge on this water — conditions are inferred from Spring Creek. The trend transfers, the absolute level does not.

Water temperature for Brown Trout
Ideal
14°C est.ideal 10–16°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
Excellent — water temperature is right today, though time of day could be better.
Likely species
Mayflies
Chironomids
Gammarids
Hatch timeline · todayQuiet day

Hatch predictions

Today's headline hatch shown — see all 3 active hatches hour by hour as a supporter.

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Sub-surface · on the nymphunder the surface

Hatch predictions

Supporters see the full sub-surface read.

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Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 3 as a supporter.

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Evidence
Records-basedModerate confidence

Based on species-occurrence records, not local invertebrate surveys.

Through the year
0–3 scale · October 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
Brown Trout fly box
Permits & access
Permit required — see local rules.
  • C&R fly-only special-reg section
What's coming
Plan ahead
5-day outlook
Other water nearby · 4
Big Spring Creek
33 km
83
Brook trout · Brown trout
Big Hunting Creek
38 km
83
Brook trout · Brown trout
Letort Spring Run
49 km
83
Brown trout
Yellow Breeches Creek
50 km
83
Brown trout · Rainbow trout
Gallery · 1
  1. Terrain map of the venue
    Terrain map
About this water

A jewel-box limestoner famous for its trico hatch — clouds of tiny spinners on August mornings over wild browns sipping in flat, clear water. Battered by development over the years and clawed back by restoration, it remains one of the great small-fly tests in the Cumberland Valley.

  • Limestone
Water quality · US Clean Water Act
  • Aquatic life: Supporting
  • Recreation: Impaired
What this classification means

Recreation: Bacteria/pathogen advisory — mind wading cuts and immersion.

EPA ATTAINS assessment unit 'Falling Spring Branch-49472900' (PA-SCR-49472900), 2024 Integrated Report. Aquatic Life use: Fully Supporting. Listed impairment causes: Pathogens. 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-49472900

The full read · show the working · for Brown Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity95 × 18%17.1
Feeding Time55 × 13%7.2
Pressure80 × 7%5.6
Insect activity61 × 12%7.3
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Spring Creekproxy
Prey activitymodelled from regional profilemodelled
What would change the calculation
The dawn and dusk windows score higher than the midday lull.
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Booking & contacts