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Nibi Metrics

Real-time water levels, forecasts, and alerts for lakes and rivers across Canada and the US. Built on official government data.

Nibi Metrics turns raw gauge readings from official hydrometric networks into something a person standing on a dock can actually use: is the water high or low for today, which way is it moving, and how unusual is this? This page explains where every number on the platform comes from and what we do to it along the way.

Water Stories

The flood of record that was overtaken

For five years, spring 2019 was the mark every Lake Muskoka decision answered to. In April 2026 the lake went two centimeters higher - and the official books have not caught up yet.

Why the Assiniboine floods every spring

Inside the freshet cycle that puts Manitoba shorelines at risk each year - and why 2026 broke the script.

How snowpack becomes summer water

The science of snow water equivalent and why it drives the season ahead.

Reading a staff gauge like a hydrologist

What the numbers on the measuring stick actually tell you.

Flash Flood Alley: how Texas rivers rise in hours

Why Central and South Texas rivers go from gravel beds to fifty-year records in an afternoon - including July 2026 on the Nueces.

What a "100-year flood" actually means

One percent, every year, forever - unwrapping hydrology's most misunderstood phrase, and how it differs from our own percentiles.

Shawanaga Lake Water Level

Live lake level, flow, historical records and forecast for Shawanaga Lake in Parry Sound, ON, Canada, built from official government gauge data.

About Shawanaga Lake

Shawanaga Lake - A central feature of the Magnetawan watershed.

Shawanaga Lake is a significant water body in the Parry Sound region of Ontario. Nestled among a network of lakes and rivers, it forms part of the Magnetawan watershed, connecting through various tributaries to the larger water system. With a drainage area of approximately 71.5 square kilometers feeding into its waters, it plays a pivotal role in the local hydrology.

The watershed context

Shawanaga Lake is surrounded by several notable peers, including Ahmic Lake, Doe Lake, Lake Bernard, Lake Cecebe, and the North Magnetawan River near Burk's Falls. This network not only contributes to the ecological diversity of the area but also influences water quality and availability throughout the seasons. The region experiences a typical snowmelt-driven seasonal hydrology, with spring freshet occurring in late April to May, followed by a natural drawdown during the summer months from July to September. As winter approaches, the lake enters an early decline phase as ice begins to form.

Why the data matters here

Monitoring the water levels and flow rates at Shawanaga Lake is essential for understanding its impact on both the surrounding ecosystems and human activities. Water levels can fluctuate significantly with seasonal changes, making it important for cottagers, anglers, and local farmers to stay informed. Today's water level is measured against historical data from the Water Survey of Canada, providing a current reading in relation to the median for this date based on over 18 years of records. This comparison is crucial as it offers insights into hydrological trends and helps gauge the lake’s health and potential variability across the seasons.

How this page is built

Readings come from official government gauges and are rolled into daily records: the daily mean, high and low for every day on record. Each calendar day gets its own baseline from the full history, so the level you see is compared against what this specific date usually looks like rather than an annual average.

How Nibi Metrics works · Water stories