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
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.
Inside the freshet cycle that puts Manitoba shorelines at risk each year - and why 2026 broke the script.
The science of snow water equivalent and why it drives the season ahead.
What the numbers on the measuring stick actually tell you.
Why Central and South Texas rivers go from gravel beds to fifty-year records in an afternoon - including July 2026 on the Nueces.
One percent, every year, forever - unwrapping hydrology's most misunderstood phrase, and how it differs from our own percentiles.
Wailuku River at Iao Valley Road, Maui Water Level
Live river level, flow, historical records and forecast for Wailuku River at Iao Valley Road, Maui in HI, United States, built from official government gauge data.
- Location HI, United States
- Watershed maui
- Primary gauge 16605500 (USGS)
About Wailuku River at Iao Valley Road, Maui
Wailuku River - A vibrant stream in the heart of Maui.
The Wailuku River flows gracefully at Iao Valley Road, showcasing the dynamic hydrology of Maui's tropical landscape. This river stands out not just for its natural beauty but also for its critical role in the island's water ecosystem. As a rainfall-driven river, Wailuku experiences rapid elevation changes, particularly influenced by trade winds and Kona storms that can bring intense rainfall in a short span of time.
The watershed context
Draining roughly 6.6 square miles, the Wailuku River has a catchment area that captures the abundant rainfall characteristic of the region. This makes it a vital component of Maui's watershed, connecting with several nearby streams such as Haipuaena Stream and Honokohau Stream. These streams together form a network that plays an essential part in capturing and directing the island's freshwater resources. The absence of a snowmelt season means that fluctuations in water levels are driven entirely by precipitation patterns, which can lead to flash floods that arise quickly during heavy downpours.
Why the data matters here
Understanding the current conditions of the Wailuku River at Iao Valley Road is crucial for local residents and visitors alike, especially in the face of tropical island hydrology, where rainfall can lead to flash flooding in minutes. Today's measurement provides valuable insight into current water levels relative to historical data collected over the past nine years by the U.S. Geological Survey (USGS). Evaluating this reading in comparison to the median for this calendar day helps gauge the river's situation more effectively than looking solely at raw elevation levels. This context supports informed decisions for outdoor activities and safety measures in the area.
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
