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.
Colorado River Blw Hoover Dam, AZ-NV Water Level
Live river level, flow, historical records and forecast for Colorado River Blw Hoover Dam, AZ-NV in NV, United States, built from official government gauge data.
- Location NV, United States
- Watershed havasu mohave lakes
- Primary gauge 09421500 (USGS)
About Colorado River Blw Hoover Dam, AZ-NV
Colorado River Blw Hoover Dam, AZ-NV - A vital artery of the arid Great Basin.
The Colorado River below Hoover Dam flows gracefully through the stark beauty of Nevada, forming a crucial waterway in the Havasu-Mohave Lakes watershed. Without a parent river, the Colorado here is a distinct feature, gathering significance as it traverses this arid landscape.
Why the data matters here
The Colorado River below Hoover Dam plays a key role in the hydrology of the region, particularly in the Great Basin, known for its unique water dynamics. In this area, mountain snowmelt typically drives spring peaks on perennial rivers, while summer thunderstorms can lead to local flash floods. Although the river is primarily perennial, it is influenced by these seasonal rhythm patterns that dictate water flow and availability throughout the year.
This river serves as a critical resource for agriculture, recreation, and ecological balance in the surrounding region. With a catchment area of approximately 171,700 square miles above the gauging station, it underscores the vast scale of water management needs for both human and natural systems.
Understanding the current flow conditions and how they relate to long-term historical data is essential for all users of this water resource. Staying informed about the river's status helps manage activities ranging from irrigation for farmers to angler access for those enjoying recreational fishing.
Today's reading at the Colorado River below Hoover Dam, measured by the U.S. Geological Survey (USGS), provides insight into real-time conditions compared against the median for this calendar day over more than 50 years of data. This evaluation is vital, as it accounts for seasonal variations and allows stakeholders to react to fluctuations in river height more effectively than raw elevation figures alone.
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
