Green River at Dutch John
Utah · Fishing & wading
Measured at USGS 09234500 — GREEN RIVER NEAR GREENDALE, UT · NWS forecast point GRZU1
Reading taken Jul 28, 11:30 PM UTC
About normal for the date
At 2,120 CFS, this gauge is running 125% of normal for late July — above the 1,690 CFS median USGS has recorded for this date across 62 years of record (1964–2026).
Data-derived guidance from USGS and NWS published values — not official advice, and not a safety assessment.
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Flood stages at Dutch John
Official National Weather Service categories for gauge GRZU1, issued by WFO GJT. Impact statements are the NWS's own wording for this location, reproduced verbatim.
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Major flood 19.0 ft
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Moderate flood 17.0 ft
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Minor flood 15.4 ft
- 15.4 ft Forest service walkways at the boatlaunch below the dam become inundated. Campground 5 miles downstream from the dam becomes flooded.
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Action 15.0 ft
- Right now 9.60 ft
NWS forecast: 10.31 ft by Jul 29, 2:00 AM UTC.
12 months of flow at Dutch John
Daily values from USGS gauge 09234500. Provisional data, subject to revision.
Highest crests on record at Dutch John
| Stage | Flow | Date |
|---|---|---|
| 16.20 ft | 11,200 CFS | Jun 14, 1999 |
| 15.13 ft | 9,440 CFS | May 27, 2022 |
| 15.13 ft | 9,440 CFS | May 30, 2020 |
| 15.05 ft | 9,320 CFS | Jun 15, 2019 |
| 15.01 ft | 9,320 CFS | Jun 19, 2016 |
| 15.00 ft | 9,300 CFS | Jun 7, 2014 |
| 14.92 ft | 9,130 CFS | Mar 30, 2017 |
| 14.76 ft | 8,560 CFS | Jun 16, 1997 |
| 14.40 ft | 8,020 CFS | Jun 6, 1986 |
| 14.25 ft | 8,190 CFS | May 14, 2015 |
Historical crests published by the National Weather Service for this gauge.
About Green River at Dutch John
This gauge sits on Green River at Dutch John, Utah, immediately below Flaming Gorge Reservoir. Flow here is controlled by releases from the dam, so it can change by hundreds of CFS within an hour with no rain anywhere in the basin — check it before you go, not the day before.
Flaming Gorge tailwater; A section to Little Hole.
Raw CFS means little on its own, so every reading on this page is shown against the USGS median for the same calendar day — 1,690 CFS for late July, from 62 years of record.
Because the National Weather Service also operates a forecast point here, the page carries the official flood-category ladder and the NWS's own stage-by-stage impact statements.
Reservoir feeding this stretch
Flow at this gauge is set by releases from Flaming Gorge Reservoir. A full pool usually means more water is on its way down.
Green River at Dutch John — common questions
What is the current flow on Green River at Dutch John?
As of the last reading on this page, Green River at Dutch John was running 2,120 CFS at a gage height of 9.60 ft, or 125% of the USGS median for this date. The number updates automatically from USGS gauge 09234500, which reports every 15 to 60 minutes.
Is that high or low for this time of year?
The USGS median flow for late July at this gauge is 1,690 CFS, calculated from 62 years of record (1964–2026). Comparing today's reading against that median is the only way a raw CFS number tells you anything — 200 CFS is a drought on one river and a flood on another.
How often does this reading update?
USGS transmits from this gauge every 15 to 60 minutes. This page bakes in the most recent reading when it is rebuilt, then refreshes live from USGS when you open it. Readings are provisional and subject to revision by USGS.
Is Green River at Dutch John wadeable right now?
That depends on the reach and on your own judgement — riverlvl will not tell you the water is safe to stand in. What it will tell you is whether today's flow is unusually high or low for the date, against a seasonal median of 1,690 CFS, which is the single most useful input to that decision. On a dam tailwater like this one, the bigger risk is a sudden generation release, which can raise the river several feet with little warning.
How do releases from Flaming Gorge Reservoir affect this stretch?
Directly and quickly. When the dam generates or spills, flow at this gauge climbs — often within an hour, often by an order of magnitude. The reservoir level itself is tracked on lakelvl.com, and the link on this page goes straight to it, so you can see whether the pool is high enough that releases are likely.
Where does this data come from?
Flow and gage height are public-domain USGS data from gauge 09234500. Flood categories, impact statements and the forecast come from the NOAA / National Weather Service National Water Prediction Service, gauge GRZU1. riverlvl adds the seasonal comparison and plain-English summary; it is not an official source and does not issue warnings.