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.
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)
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 8,654 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- 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.