USGS Streamgage 12113350
Green River at Tukwila, WA
Green River at Tukwila, WA is USGS streamgage 12113350 in Washington, monitoring river discharge in hydrologic subbasin 17110013. It sits on the Green River, alongside 7 other gauges Rivermatics tracks on the same river. It drains a watershed of about 440 square miles. Discharge records at this site go back to 1960. Typical flow runs near 549.2 cfs in July and 1,755.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 440 sq mi
- Gauge elevation
- 6 ft
- Subbasin (HUC-8)
- 17110013
- Coordinates
- 47.4651, -122.24846
- USGS site number
- 12113350
- Records begin
- 1960-10-01 (66 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 24 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 1,015.8 | 2,024.5 | 6,484.2 | |
| February | 961.9 | 2,036.2 | 5,535 | |
| March | 961.3 | 1,604.2 | 3,555.2 | |
| April | 1,054.4 | 1,755.3 | 3,018.3 | |
| May | 768.7 | 1,573.2 | 3,251 | |
| June | 474.5 | 905.2 | 2,507.7 | |
| July | 339 | 549.2 | 1,140.5 | |
| August | 272.3 | 349.2 | 582.7 | |
| September | 259.4 | 374.8 | 795.1 | |
| October | 293.5 | 496.1 | 1,246.1 | |
| November | 490.9 | 1,148.7 | 3,263.3 | |
| December | 820.7 | 1,889.7 | 6,112.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Green River at Tukwila, WA normally run highest?
- February, on the long-term record. The median daily flow that month is about 2,036.2 cfs, against 349.2 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Green River at Tukwila, WA?
- It depends on the month. In January, half of days historically fall near 2,024.5 cfs, with the middle 80% of days between 1,015.8 and 6,484.2 cfs. The month-by-month table on this page gives the full range.
- How long has Green River at Tukwila, WA been measured?
- Discharge records at USGS site 12113350 begin in 1960, about 66 years, covering roughly 67 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Green River at Tukwila, WA?
- The gauge sits at 47.4651, -122.24846, in Washington, in hydrologic subbasin 17110013, at an elevation of about 6 feet, draining roughly 440 square miles.
- Can I use Green River at Tukwila, WA data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.
Upstream and downstream on the Green River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Green River in full.
- Green River below Howard A Hanson Dam, WA 221 sq mi
- Green River at Purification Plant near Palmer, WA 231 sq mi
- Green River below Crisp Creek near Black Diamond, WA 312 sq mi
- Green River near Auburn, WA 399 sq mi
- Green River at Tukwila, WA this page
- Green River at 200Th Street at Kent, WA 451 sq mi
- Green River above S 277Th St at Kent, WA
- Green River below Meeker St at Kent, WA
Other gauges in this subbasin
- Duwamish River at Golf Course at Tukwila, WA
- Duwamish River at E Marginal Way Br at Duwamish, WA
- Green River below Howard A Hanson Dam, WA
- Green River at Purification Plant near Palmer, WA
- Newaukum Creek near Black Diamond, WA
- Green River below Crisp Creek near Black Diamond, WA
- Big Soos Creek above Hatchery near Auburn, WA
- Green River near Auburn, WA