USGS Streamgage 08355490
Rio Grande above US Hwy 380 near San Antonio, NM
Rio Grande above US Hwy 380 near San Antonio, NM is USGS streamgage 08355490 in New Mexico, monitoring river discharge in hydrologic subbasin 13020203. It drains a watershed of about 28,435 square miles. Discharge records at this site go back to 2005. Typical flow runs near 84.9 cfs in July and 401.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- New Mexico
- Drainage area
- 28,435 sq mi
- Gauge elevation
- 4,521 ft
- Subbasin (HUC-8)
- 13020203
- Coordinates
- 33.92667, -106.85117
- USGS site number
- 08355490
- Records begin
- 2005-09-30 (21 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 15 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 | 377.6 | 605.5 | 775.4 | |
| February | 450.3 | 628.7 | 890 | |
| March | 179 | 513.6 | 1,461.6 | |
| April | 35.1 | 401.3 | 2,660.3 | |
| May | 28.7 | 856.2 | 3,598.4 | |
| June | 0 | 389.3 | 2,921.7 | |
| July | 0 | 84.9 | 1,765 | |
| August | 2.6 | 124.8 | 1,693.3 | |
| September | 0.1 | 22.7 | 838.2 | |
| October | 2.3 | 109.3 | 1,077.3 | |
| November | 254 | 534.3 | 1,213.5 | |
| December | 427.4 | 723.3 | 1,245.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Rio Grande above US Hwy 380 near San Antonio, NM normally run highest?
- May, on the long-term record. The median daily flow that month is about 856.2 cfs, against 22.7 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 Rio Grande above US Hwy 380 near San Antonio, NM?
- It depends on the month. In January, half of days historically fall near 605.5 cfs, with the middle 80% of days between 377.6 and 775.4 cfs. The month-by-month table on this page gives the full range.
- How long has Rio Grande above US Hwy 380 near San Antonio, NM been measured?
- Discharge records at USGS site 08355490 begin in 2005, about 21 years, covering roughly 6,534 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Rio Grande above US Hwy 380 near San Antonio, NM?
- The gauge sits at 33.92667, -106.85117, in New Mexico, in hydrologic subbasin 13020203, at an elevation of about 4,521 feet, draining roughly 28,435 square miles.
- Can I use Rio Grande above US Hwy 380 near San Antonio, 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.