Green River at Tukwila Water Level
Live river level, flow, historical records and forecast for Green River at Tukwila in WA, United States, built from official government gauge data.
- Location WA, United States
- Watershed duwamish
- Primary gauge 12113350 (USGS)
About Green River at Tukwila
Green River at Tukwila is a gauged river in the Duwamish watershed, Washington.
What the record shows
This station’s record runs for more than 50 years.
The high-water mark is 21.7 ft (6.61 m), set in December 2025. The low-water mark is 2.69 ft (0.82 m), set in September 2016. That spread matters on the bank and at the dock: this river has moved through a wide range at the gauge.
Seasonally, the highest typical month is January at 7.49 ft (2.28 m), while the lowest typical month is August at 3.45 ft (1.05 m). The typical annual swing is 4 ft (1.23 m). For anyone watching a landing, pump, or fishing access point, that is the usual change to plan around through the year.
The watershed
The gauge sits on the lower Green River in a watershed that responds to Pacific Northwest weather. West-side rivers often rise with fall and winter atmospheric rivers, while east-side and mountain rivers usually run highest on May to July snowmelt. This site’s seasonal pattern fits the wet-season side of that picture, with January above August in the record shown here.
The drainage area above this station is 440 sq mi (1,140 km2). That is the catchment feeding this gauge, and it is the area that matters when you are thinking about runoff reaching Tukwila.
Reading the hero number
The number that matters most on this page is the current stage, read beside the median for this calendar day, not just as raw height. A stage of the same value can mean different things in different months, and this station has more than 50 years of record behind that comparison.
At this site, the operating agency is the U.S. Geological Survey.
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
Nibi Metrics - live water levels, flow, and forecasts for lakes and rivers across Canada, the US and the UK
Real-time water levels, forecasts, and alerts for lakes and rivers across Canada, the US and the UK. Built on official government data.
Nibi Metrics tracks more than 13,000 gauged lakes and rivers across Canada, the United States and the United Kingdom, reading directly from official federal monitoring networks: the Water Survey of Canada, the United States Geological Survey, Quebec's provincial hydrometric network, and the Environment Agency for England. Every number on the platform is measured, not modelled - taken from a government gauge on the water itself and compared against that location's own historical record for this exact date.
What you can see for any monitored lake or river
The level right now, in feet or metres, updated as the source agency publishes new readings - for many stations that is every five to fifteen minutes. How today compares to typical: every location carries its own typical-for-this-date band built from its historical record, so a reading is never just a number - it is above, below, or near what this water usually does on this calendar day. Which way it is moving: a measured RISING, FALLING, or STEADY verdict computed from the gauge's own recent readings, with the rate of change - the difference between a flood ending and one beginning. What comes next: level forecasts up to 72 hours ahead, driven by the gauge's recent behaviour, upstream water, and quantitative precipitation forecasts, alongside live radar, lightning, and weather for the surrounding region.
Alerts that watch the water for you
Set a threshold on any location - a level, a distance above typical, or a rate of climb - and Nibi emails or notifies you the moment the gauge crosses it. Cottagers use it for spring freshet, anglers for river conditions, marinas and municipalities for operations. The scanning runs around the clock against the same measured data shown on every page.
Where Nibi comes from
Nibi means water in Anishinaabemowin. The platform began at a family cottage on Lake Muskoka, Ontario, where the spring melt floods the shoreline most years and the only forecast was standing on the dock, looking, and guessing. It grew into an independent, member-funded platform run by Muskoka Research Inc. - no investors, no data resale, and a privacy policy shorter than most cookie banners. The core data is free for everyone, forever; paid plans add automation like multi-location alerts, deep history, and reports.
Coverage
Nibi spans the continent: every Canadian province and territory with active federal gauges - from Vancouver Island rivers to the Muskoka lakes, prairie reservoirs, and Quebec's hydrometric network - and the United States from Maine to the Texas Hill Country, the Ohio Valley, and the Pacific Northwest. Coverage grows where the water news is: when a basin floods, its gauges join the platform with their full historical records attached. Many stations report every five to fifteen minutes; most report at least hourly; every page states exactly when its gauge last spoke.
Free forever, funded by members
The core promise is simple: the water data is free, for everyone, forever. Live levels, maps, radar, and recent history never sit behind a paywall. Paid plans fund the platform by adding automation - multi-location alerts, decades of history, longer forecasts, and PDF reports - so the people who need more carry the cost for everyone who just needs to check the lake before driving up. There are no investors and no advertising deals shaping what the data says.
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How every number is computed - About the platform
