When does San Juan River near Archuleta, NM normally run highest?

June, on the long-term record. The median daily flow that month is about 919.6 cfs, against 504.1 cfs in November, 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 Archuleta, NM?

It depends on the month. In January, half of days historically fall near 508.6 cfs, with the middle 80% of days between 283.4 and 1,937.1 cfs. The month-by-month table on this page gives the full range.

How long has San Juan River near Archuleta, NM been measured?

Discharge records at USGS site 09355500 begin in 1954, about 72 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 Archuleta, NM?

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 Juan River near Archuleta, NM?

The gauge sits at 36.80189, -107.69864, in New Mexico, in hydrologic subbasin 14080101, at an elevation of about 5,663 feet, draining roughly 3,260 square miles.

Can I use San Juan River near Archuleta, NM 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.

USGS Streamgage 09355500

San Juan River near Archuleta, NM

San Juan River near Archuleta, NM is USGS streamgage 09355500 in New Mexico, monitoring river discharge in hydrologic subbasin 14080101. It sits on the San Juan River, alongside 9 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,260 square miles. Discharge records at this site go back to 1954. Typical flow runs near 664.2 cfs in July and 537.4 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

Gauge details

State: New Mexico
Drainage area: 3,260 sq mi
Gauge elevation: 5,663 ft
Subbasin (HUC-8): 14080101
Coordinates: 36.80189, -107.69864
USGS site number: 09355500
Records begin: 1954-12-01 (72 years)
Rivermatics forecast: 14-day flow outlook

14-day flow forecast

Based on observations through September 10 for San Juan River near Archuleta, NM. 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.

Forecast daily mean discharge in cubic feet per second, by date
Date	Low p10	Expected p50	High p90
September 11	851	870	886
September 12	833	868	892
September 13	821	868	902
September 14	749	864	916
September 15	673	852	937
September 16	550	815	956
September 17	481	778	950
September 18	445	757	945
September 19	414	730	941
September 20	357	691	926
September 21	386	707	944
September 22	376	695	934
September 23	392	702	938
September 24	381	691	927

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 61 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month	Low p10	Typical p50	High p90
January	283.4	508.6	1,937.1
February	282.3	510.2	2,020.7
March	293.9	514.5	2,282.6
April	326.1	537.4	2,892.3
May	326.7	755.9	4,118.1
June	375.1	919.6	4,577.3
July	443.1	664.2	2,171.9
August	477.2	702.4	1,549
September	462.9	683.8	1,502
October	373.2	581.9	1,524.8
November	287.7	504.1	1,656.7
December	279.6	510	1,771.6

All values in cubic feet per second (cfs).

Common questions

When does San Juan River near Archuleta, NM normally run highest?: June, on the long-term record. The median daily flow that month is about 919.6 cfs, against 504.1 cfs in November, 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 Archuleta, NM?: It depends on the month. In January, half of days historically fall near 508.6 cfs, with the middle 80% of days between 283.4 and 1,937.1 cfs. The month-by-month table on this page gives the full range.
How long has San Juan River near Archuleta, NM been measured?: Discharge records at USGS site 09355500 begin in 1954, about 72 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 Archuleta, NM?: 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 Juan River near Archuleta, NM?: The gauge sits at 36.80189, -107.69864, in New Mexico, in hydrologic subbasin 14080101, at an elevation of about 5,663 feet, draining roughly 3,260 square miles.
Can I use San Juan River near Archuleta, NM 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.

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