USGS Streamgage 08358300
Rio Grande Conveyance Channel at San Marcial, NM
Rio Grande Conveyance Channel at San Marcial, NM is USGS streamgage 08358300 in New Mexico, monitoring river discharge in hydrologic subbasin 13020203. Discharge records at this site go back to 1951. Typical flow runs near 209.3 cfs in July and 289.4 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.
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Gauge details
- State
- New Mexico
- Gauge elevation
- 4,456 ft
- Subbasin (HUC-8)
- 13020203
- Coordinates
- 33.68767, -106.99261
- USGS site number
- 08358300
- Records begin
- 1951-12-01 (75 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Rio Grande Conveyance Channel at San Marcial, 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.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 5.1 | 7.4 | 20 | ||
| 4.8 | 8.5 | 43 | ||
| 4.5 | 8.8 | 57.6 | ||
| 4.5 | 9.2 | 59.5 | ||
| 4.2 | 8.7 | 49.9 | ||
| 4 | 8.6 | 44.1 | ||
| 3.9 | 9 | 43.9 | ||
| 4.7 | 13.4 | 102 | ||
| 4.7 | 15.8 | 150 | ||
| 5.2 | 19.8 | 206 | ||
| 5.8 | 26 | 236 | ||
| 6.2 | 29.7 | 226 | ||
| 6.6 | 28.3 | 219 | ||
| 7.3 | 39 | 244 |
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 58 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 | 2.6 | 195.4 | 901 | |
| February | 2.1 | 203.7 | 913.3 | |
| March | 2.8 | 271.5 | 792.5 | |
| April | 10.1 | 289.4 | 827.1 | |
| May | 37.6 | 314.6 | 1,273.2 | |
| June | 11.4 | 252.4 | 1,000.8 | |
| July | 5.5 | 209.3 | 479.8 | |
| August | 3 | 199 | 434.8 | |
| September | 2.3 | 174.2 | 414.6 | |
| October | 1.3 | 187.4 | 426.5 | |
| November | 9.2 | 187.9 | 1,293.8 | |
| December | 3.8 | 192.6 | 1,068.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Rio Grande Conveyance Channel at San Marcial, NM normally run highest?
- May, on the long-term record. The median daily flow that month is about 314.6 cfs, against 174.2 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 Conveyance Channel at San Marcial, NM?
- It depends on the month. In January, half of days historically fall near 195.4 cfs, with the middle 80% of days between 2.6 and 901 cfs. The month-by-month table on this page gives the full range.
- How long has Rio Grande Conveyance Channel at San Marcial, NM been measured?
- Discharge records at USGS site 08358300 begin in 1951, about 75 years, covering roughly 8,658 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Rio Grande Conveyance Channel at San Marcial, 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 Rio Grande Conveyance Channel at San Marcial, NM?
- The gauge sits at 33.68767, -106.99261, in New Mexico, in hydrologic subbasin 13020203, at an elevation of about 4,456 feet.
- Can I use Rio Grande Conveyance Channel at San Marcial, 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.