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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.

Rio Guayanilla near Guayanilla Water Level

Live river level, flow, historical records and forecast for Rio Guayanilla near Guayanilla in PR, United States, built from official government gauge data.

About Rio Guayanilla near Guayanilla

Rio Guayanilla - A Rainfall-Driven Waterway.

The Rio Guayanilla flows near Guayanilla, Puerto Rico, carving through the landscape of Southern Puerto Rico. This river serves as an essential artery within its watershed, characterized by conditions shaped by the island's tropical climate. Tropical island hydrology leads to a dynamic and responsive watercourse, where rainfall can drive rapid changes, including the potential for flash floods.

The watershed context

The Rio Guayanilla is part of the Southern Puerto Rico watershed, draining roughly 48 square kilometres (approximately 18.9 square miles) above the USGS gauging station. This region features several nearby water bodies, including the Aes Intake Canal and various segments of the Canal de Juana Diaz, all of which share the characteristics of a watershed heavily influenced by rainfall. Given this tropical environment, rainfall patterns are critical, with significant precipitation capable of leading to swift rises in water levels. During hurricane season and tropical weather events, the river and its tributaries can experience dramatic fluctuations, necessitating close monitoring.

Why the data matters here

Daily observations from the USGS gauge at the Rio Guayanilla provide vital information about the river's current status. Today's reading can be understood better when compared to the median data for this calendar day across the station's historical record of over 45 years. This comparison is key to recognizing the dynamics of the river over time and understanding its behavior in response to rainfall events. Such insights are invaluable for local communities, enabling them to prepare for potential flooding or changes in water availability. As inhabitants of this rainfall-driven region, staying informed through our water intelligence platform can aid in navigating the specific challenges posed by the Rio Guayanilla's hydrology.

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