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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.

Kemoo 5 Reservoir, Oahu Water Level

Live lake level, flow, historical records and forecast for Kemoo 5 Reservoir, Oahu in HI, United States, built from official government gauge data.

About Kemoo 5 Reservoir, Oahu

Kemoo 5 Reservoir - A pivotal water source on Oahu.

Kemoo 5 Reservoir lies at the heart of Oahu's intricate hydrological landscape, serving as a crucial reservoir in this rainfall-driven ecosystem. The reservoir embodies the dynamic nature of Hawaii's water systems, where conditions can change rapidly with the onset of rain. Situated within the Oahu watershed, Kemoo 5 Reservoir caters to various local needs, while showcasing the unique characteristics of this tropical environment.

The watershed context

The Oahu watershed encompasses multiple streams and reservoirs that reflect the island's steep topography and tropical climate. Kemoo 5 Reservoir is positioned among several peers, including Heeia Stream and Helemano 6 Reservoir, creating a network of water bodies that share resources and influences. This interconnected system is shaped by the island's rapid rainfall accumulation, leading to quick responses in water levels.

Unlike other regions in the United States, Oahu does not experience a snowmelt season; instead, its water dynamics are driven by frequent rain events, largely influenced by trade winds and the occasional Kona storms. This distinctive hydrology results in flash floods that can occur suddenly and dramatically, with water levels rising within minutes to hours.

Why the data matters here

Understanding data from Kemoo 5 Reservoir is essential for various stakeholders, including local residents and water management authorities. The U.S. Geological Survey (USGS) monitors this reservoir, providing critical observations that help gauge water levels and inform the management of water resources. With 11 years of record data, today's reading offers insights into the reservoir's current state compared against the median for this calendar day throughout its historical record. This comparison is crucial, as it reflects trends in water availability and informs decisions related to conservation and usage.

By tracking these fluctuations, communities can better adapt to the changing hydrological conditions of Oahu and prepare for potential flooding events, ensuring a balanced approach to managing this vital resource.

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