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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.

Pefferlaw Brook near Udora Water Level

Live river level, flow, historical records and forecast for Pefferlaw Brook near Udora in Ontario, ON, Canada, built from official government gauge data.

About Pefferlaw Brook near Udora

Pefferlaw Brook - a vital waterway in Ontario's landscape.

Pefferlaw Brook meanders near Udora, coursing through Ontario's Black River - Lake Simcoe watershed. This river plays a pivotal role in the regional hydrology, connecting local ecosystems and supporting the natural rhythms of spring and summer. With a drainage area of approximately 350 square kilometres above the station, it is integral in managing both surface water flow and local aquatic habitats.

The watershed context

The Pefferlaw Brook is part of a greater network within the Black River - Lake Simcoe watershed, which is home to several fellow waterways such as the Beaver River, Black River, and Holland River East. As part of this network, Pefferlaw Brook experiences a hydrological cycle primarily driven by snowmelt. The spring freshet typically occurs from late April into May, during which melting snow significantly increases water levels. This seasonal influx is crucial for maintaining ecological balance in the surrounding areas. Following this peak, a natural summer drawdown occurs from July to September as evaporation rises and inflow decreases.

Why the data matters here

Monitoring the flow of Pefferlaw Brook is essential for understanding its health and the impact of seasonal changes on the broader watershed. The river is equipped with discharge measurements, allowing for a comprehensive view of its flow patterns and water levels over time. The current reading from the Water Survey of Canada enables stakeholders and locals to compare today's conditions against the median for this calendar day, derived from 39 years of historical record. This insight is invaluable; knowing how present levels stack up against the average provides a clearer picture of the river's behavior within its seasonal context, supporting effective management and conservation efforts in the region.

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