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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.

Mad River at Avening Water Level

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

About Mad River at Avening

Mad River - a dynamic waterway of the Nottawasaga watershed.

The Mad River flows gracefully at Avening, Ontario, as part of the vibrant Nottawasaga watershed. This river, which is significant in the region's hydrology, benefits from a substantial drainage area of approximately 245 square kilometres. With its flowing waters, the Mad River supports various local ecosystems and plays a vital role in the regional water cycle.

The watershed context

The Nottawasaga watershed is characterized by its seasonal rhythms, driven largely by snowmelt, which leads to a spring freshet typically occurring from late April to May. This period brings increased water levels as melting snow contributes to the river's flow. As summer approaches, natural drawdown occurs from July to September, influenced by evaporation and reduced inflow. Early winter brings a declining water level as ice begins to form, creating a distinct seasonal pattern that affects not only the river but also the ecosystems supported by its waters.

Nearby, rivers and creeks such as the Boyne River, Coldwater River, and Hogg Creek are part of the same watershed complex, contributing to a rich network of aquatic habitats. This interconnectedness enhances the ecological integrity of the region and offers various recreational opportunities for those who visit and live nearby.

Why the data matters here

Understanding the hydrological data for the Mad River at Avening is crucial for local stakeholders, including residents, farmers, and outdoor enthusiasts. The river's current status provides insights into its health and guides water management practices. The gauge also measures discharge, offering an important perspective on water flow dynamics in the area.

Today's reading can be compared to the historical median for this date, which helps in assessing whether levels are above or below normal for this time of year. The Water Survey of Canada, which maintains this gauge, allows residents and users of this river to monitor conditions effectively, ensuring sustainable use and management of this vital waterway.

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