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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.

Mindemoya Lake Water Level

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

About Mindemoya Lake

Mindemoya Lake - A natural hub in the heart of Manitoulin.

Mindemoya Lake, located in the picturesque Manitoulin region of Ontario, serves as a vital ecological and recreational resource for the surrounding communities. With its expansive catchment area of approximately 156 square kilometers, the lake plays an essential role in the local hydrology, supported by the natural rhythms of the seasons.

The watershed context

Mindemoya Lake is nestled within the Manitoulin Islands watershed. This area is characterized by snowmelt-driven seasonal hydrology, leading to a spring freshet that typically occurs from late April through May. The inflow during this season replenishes the lake, providing essential water levels before the natural summer drawdown begins in July and continues through September. As summer progresses, evaporation and reduced inflows contribute to the lake's declining levels. In early winter, the onset of ice formation further contributes to a seasonal decline in water levels, marking the annual cycle of this region's hydrology.

Why the data matters here

Monitoring data from stations such as Mindemoya Lake is crucial for understanding the water body's characteristics and its ecological health. Today's reading from the lake, measured against the median for this calendar day across 18 years of historical data, allows us to gauge current conditions' alignment with typical seasonal variations. The Water Survey of Canada provides this data, enhancing our ability to respond to fluctuations that may affect local ecosystems, recreational activities, and water quality in this significant natural resource.

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