Spring Creek · Limestone · Pennsylvania, US

Falling Spring Branch

Falling Spring Branch terrain map

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

Today · Slow going — pick your moments
Hopper
Forecast · Today
Slow going — pick your moments
Slow going — pick your moments and do not force it.
90% projected
Today's fly
Hopper
Hopper
Conditions on the water · Today
Proxy gauge
Level
Falling
Proxy
via Spring Creek
Water temp18.3°C
ClaritySlightly coloured
Weather25°C
WindN 9 km/h
Pressure1019 hPa
Rain · recent0.1 mm
Rain · ahead7.8 mm

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

Water temperature for Rainbow Trout
Warm — slow
18°C est.ideal 10–18°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
Excellent — water temperature is right today, though insect activity could be better.
Likely species
Mayflies
Caddisflies
terrestrials
Hatch timeline · todayPeak at 12pm

12pm(now) — Grasshopper (Eastern)

Stage: Terrestrials on topApproach: Dry flyActivity: 85%
Also:Reed Smut46%Trico (Eastern)40%
Peak emergence windowWeather boostDegree-days at peak5 food groups active

Peak activity at 12pm — Grasshopper (Eastern) (Grasshopper (Eastern), Peak emergence window)

Sub-surface · on the nymphunder the surface

Hatch predictions

See the full sub-surface read with Pro.

Start free trial

14-day free trial. Cancel anytime.

Beyond the hatch · worth watchingambient prey(1)

Hatch predictions

Top prey shown — see all 4 with Pro.

Start free trial

14-day free trial. Cancel anytime.

Evidence
Records-basedModerate confidence

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

Through the year
0–3 scale · September 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
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
Brook trout · Brown trout
Big Hunting Creek
38 km
Brook trout · Brown trout
Letort Spring Run
49 km
Brown trout
Yellow Breeches Creek
50 km
40
Brown trout · Rainbow trout
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 Rainbow Trout · confidence 90%
How the 83 is built — score × weight = contribution
Temperature100 × 28%28.0
Flow80 × 22%17.6
Clarity85 × 18%15.3
Feeding Time70 × 13%9.1
Pressure75 × 7%5.3
Insect activity63 × 12%7.6
Conditions total= 83
Can you trust it?
Water temperatureair-to-water estimateestimated
Level / flowproxy via Spring Creekproxy
Prey activitymodelled from regional profilemodelled
Directions
Apple MapsGoogle Maps
Seasons & zones
  • Trout 1 January → 31 December
Related guides
Euro Nymphingsubsurface methods
Booking & contacts