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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.

Rock Creek at Joyce Road Washington Water Level

Live river level, flow, historical records and forecast for Rock Creek at Joyce Road Washington in DC, United States, built from official government gauge data.

About Rock Creek at Joyce Road Washington

Rock Creek - A vibrant urban waterway.

Nestled within the landscape of Washington, DC, Rock Creek at Joyce Road serves as a vital stretch of water that interlaces with the surrounding urban environment. This river offers both natural beauty and functional significance, contributing to the ecological and hydrological frameworks of the Middle Potomac-Anacostia-Occoquan watershed.

The watershed context

Rock Creek flows through a catchment area of roughly 64 square miles, striking a balance between urban development and natural ecosystems. The watershed is characterized by a mix of residential, commercial, and parkland areas, illustrating the intricate relationship between city life and nature. The hydrology of the region is influenced by seasonal patterns typical of the Mid-Atlantic, where rain floods can occur in winter and spring, accompanied by occasional tropical remnants that lead to more extreme events. This climatic context necessitates careful monitoring and management, particularly as water levels can vary significantly with precipitation events.

The surrounding area includes several peer waterways, such as Accotink Creek and the Anacostia River, which are integral to the greater drainage systems. Each stream and river within this landscape plays a role in managing stormwater and providing habitat, enhancing the overall health of the environment.

Why the data matters here

Monitoring Rock Creek's water levels is essential for understanding local hydrology and responding to potential flood events. The U.S. Geological Survey (USGS) operates the station, which not only measures river elevation but also monitors discharge, providing crucial data for assessing water flow in relation to rainfall and stormwater runoff.

Today's reading will be compared against the historical median for this calendar day, drawing from over 14 years of data. This comparison aids residents, planners, and conservationists in gauging the current state of the creek, illustrating its behavior relative to long-term trends. Understanding these patterns supports informed decisions about land use, emergency management, and environmental protection, ensuring that Rock Creek continues to thrive within this vibrant urban setting.

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