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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.

South Nation River near Plantagenet Springs Water Level

Live river level, flow, historical records and forecast for South Nation River near Plantagenet Springs in Canada, ON, Canada, built from official government gauge data.

About South Nation River near Plantagenet Springs

South Nation River - a key tributary in the Lower Ottawa watershed.

The South Nation River near Plantagenet Springs plays an important role in the hydrology of the Lower Ottawa - South Nation watershed. This river, with a substantial catchment area of approximately 3,800 square kilometres, is interwoven with several smaller water bodies, such as Becketts Creek and the Payne River, all sharing the landscape and ecological benefits of this rich region.

The watershed context

The South Nation River serves as a vital stream that captures the seasonal rhythms of Ontario's water systems. This snowmelt-driven river experiences a pronounced spring freshet around late April to May, driven by melting snow, which raises water levels significantly and supports local ecology and hydrological dynamics. As summer approaches, natural drawdowns occur from July to September, marking a typical seasonal pattern where evaporation and reduced inflow decrease water levels. In early winter, as ice begins to form, we can expect a gradual decline in water levels, further influencing the river's flow and ecology.

Why the data matters here

Monitoring the South Nation River is essential for understanding regional water dynamics and ensuring informed management practices. The station provides discharge measurements, allowing stakeholders to track changes in flow patterns over time. Today's reading, compared against the median for this calendar day over nearly 50 years of data provided by Water Survey of Canada, offers insight into changes and trends that impact the river's health and the surrounding ecosystems. This context is invaluable to local cottagers, farmers, and residents who depend on a balanced water supply and ecosystem sustainability.

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