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Pennsylvania

Allegheny Reservoir

Set in McKean County, Allegheny Reservoir gives Pennsylvania anglers a 12,222-acre largemouth fishery that shifts with season and weather.

Surface
12,222acres
Primary species
Largemouth
§ 01Today on the water · Allegheny Reservoirvia Open-Meteo · 08:30 local
Air temp
70.4°F
Barometric
29.95″
↓falling 24h(-0.12)
Wind
7mph
from SSW
Moon
Waning Gibbous
day 19.4 · 77% lit

Air conditions sampled near the lake center, not measured on the water · refreshed ~15 min

§ 03Next 3 daysvia Open-Meteo · interpretation
  1. 1
    sepTue

    Stable window

    hi 85° · lo 69°

    Anytime through the day. Quiet weather day; lean on seasonal pattern and structure.

    ── light sw wind · settled

  2. 2
    sepWed

    Stable window

    hi 86° · lo 70°

    Anytime through the day. Quiet weather day; lean on seasonal pattern and structure.

    ── light s wind

  3. 3
    sepThu

    Tougher window

    hi 84° · lo 65°

    Pick the calmest hour and stay flexible. Conditions push hard today; bite likely shrinks. Plan around the calmest gap.

    ── heavy precipitation · bite likely shrinks

§ 04Field notesPennsylvania

Where it is

Allegheny Reservoir sits in McKean County, Pennsylvania, covering about 12,222 acres. The fish move with the calendar, and the productive water moves with the fish.

Seasonal pattern

Spring. Allegheny Reservoir's northern-Pennsylvania spring builds slowly; McKean County largemouth stage on cove mouths as the upper layers warm, spawning later than the state's southern waters.

Summer. Across 12,222 acres, summer fish leave the bright banks by mid-morning for deeper edges and shade; early light on the shallows is the dependable stretch.

Fall. A genuine highlight — cooling water concentrates bait in the coves and the bass feed hard before the highlands cool for good.

Winter. Hard cold settles in; fish sit deep and the reservoir fishes slow until spring.

Key structure

  • Creek and cove mouths that funnel fish and bait
  • Weed edges and the clean lines along them
  • Inside turns where a bank changes angle
  • Submerged wood, brush, and laydown cover

The calendar decides which of these is worth time on a given day.

Forage

Forage on Allegheny Reservoir centers on baitfish and panfish; largemouth follow those schools across cover and depth changes.

Access

Access to Allegheny Reservoir is generally public; check water levels and conditions before launching.

Regulations

Check current state and local regulations before fishing; limits and seasons can change.

§ 05Sources & field guides

Field guides

Data & references

  • Today's conditions — Open-Meteo, refreshed every ~15 min
  • Moon phase — local astronomical calculation, no external API
  • Lake area, depth, structure — Identity, surface area, coordinates and county/state are from the ProjectD canonical waterbody index (snapshot conus-20260518-v1, group gnis:01217454). Maximum depth and regulation links were not available from an acceptable source and are intentionally omitted.
  • Regulations — verify current state and local regulations before fishing

Last revised · Back to Lake Guide