290.18 ft NAVD88
level Reading is unusually high for mid-August.
Reading comes straight from U.S. Army Corps of Engineers Access to Water data (USACE series BlueMarsh.Elev.Inst.30Minutes.0.Rev-DCP) and updates live when you load this page.
Blue Marsh Lake through the year
The band is the lake's own normal: where the level has run on each calendar day, 2011–2026. 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)
- 2017 (wettest on record)
- 2024 (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 | not published by the operator |
|---|---|
| Gauge | USACE series BlueMarsh.Elev.Inst.30Minutes.0.Rev-DCP · U.S. Army Corps of Engineers Access to Water data |
| Datum | NAVD88 |
| Last verified | August 20, 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
How full is Blue Marsh Lake right now?
Blue Marsh Lake is at 290.18 ft (NAVD88) as of August 20, 2026 — Reading is unusually high for mid-August.
Is Blue Marsh Lake full?
USACE Philadelphia District doesn't publish a conservation-pool figure for Blue Marsh Lake, so this page shows the reading against the lake's own seasonal history instead.
What is full pool for Blue Marsh Lake?
USACE Philadelphia District doesn't publish a single conservation-pool elevation for Blue Marsh Lake. The seasonal chart shows the range the lake actually runs instead.