1328.70 ft NAVD88
level 0.7 ft above full pool — on the high side for late September
Reading comes straight from U.S. Geological Survey National Water Information System (USGS gauge 03012520) and updates live when you load this page.
Is Allegheny Reservoir full?
Yes, and then some — 0.7 ft above full pool as of September 24, 2026
How full is Allegheny Reservoir? Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.
Allegheny Reservoir through the year
The band is the lake's own normal: where the level has run on each calendar day, 2015–2026. The summer drawdown — and how this year sits in it — shows up without reading a single number.
This year vs the years that matter
This year's trace against last year and the driest and wettest years on record — the drought-context question every lake regular asks.
- 2026 (this year)
- 2025 (last year)
- 2018 (wettest on record)
- 2016 (driest on record)
Full pool, datum, and the gauge
"Full pool" here means the conservation pool — the level the lake is designed to hold for water supply and recreation, not the flood-control space above it. The full explainer covers flood pool and dead pool too.
| Full pool | 1328.00 ft NAVD88 · per USACE Pittsburgh District (LRP) full-pool reference |
|---|---|
| Gauge | USGS gauge 03012520 · U.S. Geological Survey National Water Information System |
| Datum | NAVD88 — The gauge reads NAVD88 while the 1,328 ft summer pool is quoted on NGVD29 — about 0.6-0.7 ft apart here — so the lake sits nearer summer pool than the raw gap suggests. |
| Last verified | August 15, 2026 |
LakeDates reports lake level, not ramp status. Whether a given ramp or marina is usable at this level varies ramp by ramp — call the marina before you tow.
Quick answers
What is the lake level for Allegheny Reservoir today?
Allegheny Reservoir is at 1328.70 ft (NAVD88) as of September 24, 2026 — 0.7 ft above full pool — on the high side for late September.
Is Allegheny Reservoir full?
Yes and then some — at 1328.70 ft on September 24, 2026, Allegheny Reservoir is 0.7 ft above its full pool of 1328.00 ft (NAVD88), using flood storage.
How full is Allegheny Reservoir?
Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.
What is full pool for Allegheny Reservoir?
Full pool (the conservation pool) for Allegheny Reservoir is 1328.00 ft NAVD88, per USACE Pittsburgh District (LRP) full-pool reference. Levels above it use flood storage; levels below it are drawdown.