USGS Streamgage 09328910
San Rafael River at Mouth near Green River, UT
San Rafael River at Mouth near Green River, UT is USGS streamgage 09328910 in Utah, monitoring river discharge in hydrologic subbasin 14060009. It sits on the San Rafael River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,123 square miles. Discharge records at this site go back to 2015. Typical flow runs near 14.1 cfs in July and 29.1 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Utah
- Drainage area
- 3,123 sq mi
- Gauge elevation
- 4,017 ft
- Subbasin (HUC-8)
- 14060009
- Coordinates
- 38.75776, -110.14353
- USGS site number
- 09328910
- Records begin
- 2015-07-16 (11 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for San Rafael River at Mouth near Green River, UT. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 6.4 | 8.3 | 10.7 | ||
| 4.3 | 7.3 | 11.6 | ||
| 2.3 | 5.9 | 11.2 | ||
| 1.3 | 5.4 | 13.2 | ||
| 1 | 4.8 | 12.3 | ||
| 1.2 | 5 | 13.4 | ||
| 1.5 | 5.3 | 13.4 | ||
| 0.7 | 4 | 11 | ||
| 0.6 | 3.7 | 9.9 | ||
| 0.3 | 3 | 8.4 | ||
| 0 | 2.5 | 7.2 | ||
| 0 | 1.7 | 7.1 | ||
| 0 | 1.3 | 6.2 | ||
| 0 | 0.9 | 5.8 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 11 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 | 7 | 15.3 | 38.6 | |
| February | 10.4 | 24.7 | 71.9 | |
| March | 11.8 | 26.2 | 121 | |
| April | 3.8 | 29.1 | 196.7 | |
| May | 2.2 | 57.3 | 419.9 | |
| June | 0 | 58.1 | 818.3 | |
| July | 0 | 14.1 | 318.9 | |
| August | 0.1 | 11.9 | 133.9 | |
| September | 0 | 7.7 | 147 | |
| October | 0.4 | 15 | 243 | |
| November | 1.4 | 21.8 | 42.2 | |
| December | 3 | 15.3 | 45.9 |
All values in cubic feet per second (cfs).
Common questions
- When does San Rafael River at Mouth near Green River, UT normally run highest?
- June, on the long-term record. The median daily flow that month is about 58.1 cfs, against 7.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for San Rafael River at Mouth near Green River, UT?
- It depends on the month. In January, half of days historically fall near 15.3 cfs, with the middle 80% of days between 7 and 38.6 cfs. The month-by-month table on this page gives the full range.
- How long has San Rafael River at Mouth near Green River, UT been measured?
- Discharge records at USGS site 09328910 begin in 2015, about 11 years, covering roughly 4,035 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for San Rafael River at Mouth near Green River, UT?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- Where is San Rafael River at Mouth near Green River, UT?
- The gauge sits at 38.75776, -110.14353, in Utah, in hydrologic subbasin 14060009, at an elevation of about 4,017 feet, draining roughly 3,123 square miles.
- Can I use San Rafael River at Mouth near Green River, UT 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 San Rafael River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the San Rafael River in full.
- San Rafael River near Castle Dale, Utah 939 sq mi
- San Rafael River near Green River, UT 1,628 sq mi
- San Rafael River at Mouth near Green River, UT this page