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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.

Rideau River below Manotick Water Level

Live river level, flow, historical records and forecast for Rideau River below Manotick in Canada, ON, Canada, built from official government gauge data.

About Rideau River below Manotick

Rideau River below Manotick - A vital stretch of the Rideau system.

The Rideau River below Manotick is an essential section of the Rideau River, serving both ecological and recreational roles in the region. As part of the broader Rideau watershed, this stretch of river is influenced by the seasonal rhythms typical of Ontario's climate, notably the snowmelt-driven hydrology.

The watershed context

Draining roughly 3,140 square kilometres above the station, the Rideau River below Manotick draws on a diverse landscape that includes agricultural land, urban areas, and natural forests. This section of the river is connected to numerous tributaries and neighboring waterways, including the Kemptville Creek near Kemptville and the Tay River in Perth. These connections create a network of waterways that contribute to the ecological health of the region, providing habitats for various aquatic species and supporting local biodiversity.

Seasonally, water levels in the Rideau River exhibit notable changes, with the spring freshet typically occurring from late April to May as snowmelt raises water flow substantially. During the summer months, from July to September, natural drawdowns are expected as evaporation and lower inflows take hold, reflecting the river’s dynamic nature. As winter approaches, particularly in early winter, the river sees a decline in levels coinciding with ice formation.

Why the data matters here

Today’s readings from the Rideau River below Manotick are particularly significant as they offer insights into the river's current health and flow conditions. This data is not only crucial for flood monitoring but also essential for understanding how environmental factors impact recreational activities like fishing, boating, and waterfront enjoyment. By comparing today's measurement against the median for this calendar day drawn from a historical record spanning over 45 years, residents and visitors alike can gain a better perspective on the river’s current state in relation to its typical conditions. The operating agency responsible for these measurements, the Water Survey of Canada (WSC), ensures that these insights are readily available for all stakeholders involved.

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