235.00 ft NGVD29
level Reading is typical for mid-August.
Reading comes straight from U.S. Geological Survey National Water Information System (USGS gauge 14219950) and updates live when you load this page.
Lake Merwin through the year
The band is the lake's own normal: where the level has run on each calendar day, 2017–2026. 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, driest on record)
- 2020 (wettest 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 | USGS gauge 14219950 · U.S. Geological Survey National Water Information System |
| Datum | NGVD29 |
| 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 Lake Merwin right now?
Lake Merwin is at 235.00 ft (NGVD29) as of August 19, 2026 — Reading is typical for mid-August.
Is Lake Merwin full?
PacifiCorp (Merwin Dam) doesn't publish a conservation-pool figure for Lake Merwin, so this page shows the reading against the lake's own seasonal history instead.
What is full pool for Lake Merwin?
PacifiCorp (Merwin Dam) doesn't publish a single conservation-pool elevation for Lake Merwin. The seasonal chart shows the range the lake actually runs instead.