USGS Streamgage 09379500
San Juan River near Bluff, UT
San Juan River near Bluff, UT is USGS streamgage 09379500 in Utah, monitoring river discharge in hydrologic subbasin 14080205. It sits on the San Juan River, alongside 9 other gauges Rivermatics tracks on the same river. It drains a watershed of about 23,000 square miles. Discharge records at this site go back to 1914. Typical flow runs near 1,365.6 cfs in July and 1,924.3 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, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
Gauge details
- State
- Utah
- Drainage area
- 23,000 sq mi
- Gauge elevation
- 4,068 ft
- Subbasin (HUC-8)
- 14080205
- Coordinates
- 37.15068, -109.86669
- USGS site number
- 09379500
- Records begin
- 1914-10-30 (112 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for San Juan River near Bluff, 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 |
|---|---|---|---|---|
| 497 | 525 | 554 | ||
| 469 | 524 | 599 | ||
| 452 | 524 | 631 | ||
| 473 | 577 | 957 | ||
| 524 | 768 | 1,716 | ||
| 590 | 966 | 2,285 | ||
| 648 | 1,151 | 2,759 | ||
| 641 | 1,086 | 2,298 | ||
| 588 | 903 | 1,711 | ||
| 547 | 800 | 1,416 | ||
| 517 | 732 | 1,223 | ||
| 501 | 695 | 1,143 | ||
| 482 | 659 | 1,045 | ||
| 473 | 652 | 1,063 |
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 112 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 | 467.8 | 802.6 | 2,128.7 | |
| February | 562.5 | 925.3 | 2,666.9 | |
| March | 617.9 | 1,177.6 | 3,627.4 | |
| April | 560.7 | 1,924.3 | 6,960 | |
| May | 1,015.6 | 3,629.7 | 9,598.4 | |
| June | 1,065.6 | 4,121.3 | 10,466.3 | |
| July | 381.5 | 1,365.6 | 5,550.3 | |
| August | 291.1 | 1,019.4 | 3,419.7 | |
| September | 327.9 | 887.1 | 3,258.3 | |
| October | 503.3 | 957.1 | 2,595.8 | |
| November | 589.8 | 892.3 | 2,037.3 | |
| December | 502.6 | 802.7 | 1,936.1 |
All values in cubic feet per second (cfs).
Common questions
- When does San Juan River near Bluff, UT normally run highest?
- June, on the long-term record. The median daily flow that month is about 4,121.3 cfs, against 802.6 cfs in January, 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 Juan River near Bluff, UT?
- It depends on the month. In January, half of days historically fall near 802.6 cfs, with the middle 80% of days between 467.8 and 2,128.7 cfs. The month-by-month table on this page gives the full range.
- How long has San Juan River near Bluff, UT been measured?
- Discharge records at USGS site 09379500 begin in 1914, about 112 years, covering roughly 9,200 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 Juan River near Bluff, 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. A companion model forecasts each day's water-temperature high and low. 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 Juan River near Bluff, UT?
- The gauge sits at 37.15068, -109.86669, in Utah, in hydrologic subbasin 14080205, at an elevation of about 4,068 feet, draining roughly 23,000 square miles.
- Can I use San Juan River near Bluff, 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 Juan River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the San Juan River in full.
- San Juan River at Pagosa Springs, CO 281 sq mi
- San Juan River near Carracas, CO 1,250 sq mi
- San Juan River near Archuleta, NM 3,260 sq mi
- San Juan River at Bloomfield, NM 5,350 sq mi
- San Juan River at Farmington, NM 7,240 sq mi
- San Juan River at Shiprock, NM 12,900 sq mi
- San Juan River at Four Corners, CO 14,600 sq mi
- San Juan River near Bluff, UT this page
- San Juan River below Piute Farms Wash near Monument Vly, UT 24,000 sq mi
- San Juan River near Co Rd 119 at Pagosa Springs, CO