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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.

Aux Sables River at Massey Water Level

Live river level, flow, historical records and forecast for Aux Sables River at Massey in Canada, ON, Canada, built from official government gauge data.

About Aux Sables River at Massey

Aux Sables River - a vital tributary of the Spanish River.

The Aux Sables River flows through the heart of Ontario, showcasing the dynamic interactions of river systems within the Spanish watershed. This stretch, measured at Massey, plays an important role in capturing the seasonal rhythms dictated by the surrounding environment. With a drainage area of approximately 1,340 square kilometres upstream, the river feeds into a larger network that ultimately converges into the Spanish River.

The watershed context

As part of the Spanish River watershed, the Aux Sables River becomes a crucial conduit for water and nutrients as it meanders through varied terrain. This river's health and flow are influenced by the annual snowmelt that defines the region's seasonal cycles. During late April and May, the spring freshet brings a surge of water, replenishing the ecosystem and supporting aquatic life.

The river also experiences natural declines during the summer months, from July through September, due to evaporation and reduced inflow. As autumn sets in and the temperatures cool, the river sees early-winter declines, coinciding with the formation of ice on its surface. These seasonal changes are not only important to the river itself but also to the flora and fauna that rely on its waters throughout the year.

Why the data matters here

Current measurements from the Aux Sables River at Massey provide key insights into its health and stability. Today's reading can be compared against the median for this calendar day, calculated from the historical data over the past 49 years. This approach offers a more reliable perspective on the river's condition than pure elevation figures, as it contextualizes current water levels within a larger framework of historical trends.

The Water Survey of Canada monitors and provides critical data for this station, allowing local residents, anglers, and ecologists to stay informed about fluctuations in river flow and the broader health of the watershed. Understanding these patterns is essential for appreciating and maintaining the Aux Sables River's ecosystem and its relationship with the Spanish River.

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