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Lake Insights is for informational and planning purposes—not official forecasts, navigation charts, or emergency guidance.

Not a substitute for on-site conditions, local rules, or your own judgment on the water.

Lake Ontario Overview | Lake Insights

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Quick Lake Info

Surface Area: 4,701,270 acres
Max Depth: 802 ft
Shoreline: 712 mi
Long-term avg: 246.1 ft
Type: U.S. Army Corps of Engineers / Environment and Climate Change Canada

Overview
Lake Level
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Gear & Essentials

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Lake Ontario lake and shoreline

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Lake Ontario

Lake Ontario

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Water level

247.33 ft

Updated: 1 hr ago • Source: NOAA / U.S. Army Corps of Engineers (coordinated network)

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At-a-glance

Air temp

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Current

Lake level

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Forecast

Forecast

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Wind

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Pressure

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Barometric

Overview

Lake Ontario is the easternmost Great Lake, downstream of Niagara Falls. Levels are regulated on the St. Lawrence but reported in IGLD 1985 as coordinated lake-wide means, not as a fixed full pool.

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On the Lake

Find key access points and services around Lake Ontario.

Boat Ramps
Bait & Tackle
Lodging

Lake Ontario Resources

Kidde Fire Extinguisher for Boats, Single-Use 5BC

Safety • Boating

Combats Marine Fires: Stop basic fires common to boats: flammable liquids and gases (Class B) & electrical equipment (Class C)

Available onamazon

Explore Lake Ontario resources→

Nearby Lakes

Within 50 miles

No other lakes with locations within 50 miles.

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About this data

Source: NOAA / U.S. Army Corps of Engineers (coordinated network)
Freshness: Last reading 1 hour ago. Agency feeds can be delayed or revised.
Use: Informational only—not official forecasts, navigation charts, or emergency guidance.

Learn how we select sources and label datums on our Data sources & methodology page. Editorial standards are on Editorial standards.

Report incorrect data for this lake