Lake Ontario Water Level
Current level
247.17ft
+1.11 ft vs long-term average
Since last reading
Down 0.03 ft
Latest movement · prior daily summary
7-day trend
Gear
Ask
Dock
Talk
Ask anything about Lake Ontario.
Water Level History
Elevation (ft) IGLD85 · MSL
Level breakdown & datum
- Long-term avg
- 246.06 ft
- Chart datum (LWD)
- 243.3 ft
- Current Level
- 247.17 ft
- Difference
- 1.11 ft
- DatumVertical reference for published pool and stage elevations at this lake (from the lake catalog).
- IGLD85
- Elevation reference
- MSL
- Source
- NOAA / U.S. Army Corps of Engineers (coordinated network)
Level thresholds
Published elevations from lake operators when provided by the data service.
- Flood stageNot available
- Full poolNot available
- Winter poolNot available
Gear & Essentials
· curated for Lake OntarioAs an Amazon Associate, Lake Insights earns from qualifying purchases.
7 & 30 day trends
7-day change
7-day trend: Falling
8 daily readings in the last 7 days · Hover for date and level
30-day change
31 daily readings in the last 30 days · Hover for date and level
Daily level summary
Jul 10, 2026
247.22 ft
-0.03 ft
Jul 9, 2026
247.25 ft
+0.01 ft
Jul 8, 2026
247.24 ft
-0.01 ft
Jul 7, 2026
247.25 ft
+0.01 ft
Jul 6, 2026
247.24 ft
-0.04 ft
Jul 5, 2026
247.28 ft
-0.06 ft
Jul 4, 2026
247.34 ft
+0.01 ft
| Date | Level (ft) | Change (ft) |
|---|---|---|
| Jul 10, 2026 | 247.22 | -0.03 |
| Jul 9, 2026 | 247.25 | +0.01 |
| Jul 8, 2026 | 247.24 | -0.01 |
| Jul 7, 2026 | 247.25 | +0.01 |
| Jul 6, 2026 | 247.24 | -0.04 |
| Jul 5, 2026 | 247.28 | -0.06 |
| Jul 4, 2026 | 247.34 | +0.01 |
| Jul 3, 2026 | 247.33 | +0.03 |
| Jul 2, 2026 | 247.3 | -0.01 |
| Jul 1, 2026 | 247.31 | +0.05 |
| Jun 30, 2026 | 247.26 | +0.01 |
| Jun 29, 2026 | 247.25 | -0.05 |
| Jun 28, 2026 | 247.3 | -0.03 |
| Jun 27, 2026 | 247.33 | 0 |
Lake Ontario water level — common questions
- What is the current water level at Lake Ontario?
- The current water level at Lake Ontario is 247.17 ft (updated 5 hours ago). See the live chart and daily history on this page for trends.
- How often is Lake Ontario lake level data updated?
- Readings are refreshed when NOAA / U.S. Army Corps of Engineers (coordinated network) publishes new gauge data — typically daily for most reservoirs. The timestamp above the chart shows when the latest observation arrived on Lake Insights.
- How does the current level compare to the long-term average at Lake Ontario?
- Lake Ontario is currently +1.11 ft vs long-term average relative to its long-term average elevation on Lake Insights.
Lake level glossary
Definitions for pool targets, datums, and how elevation readings are labeled.