USGS Streamgage 08437710
Pecos River at RR 1776 near Grandfalls, TX
Pecos River at RR 1776 near Grandfalls, TX is USGS streamgage 08437710 in Texas, monitoring river discharge in hydrologic subbasin 13070001. It drains a watershed of about 34,740 square miles. Discharge records at this site go back to 2007. Typical flow runs near 2.1 cfs in July and 2.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Texas
- Drainage area
- 34,740 sq mi
- Gauge elevation
- 2,440 ft
- Subbasin (HUC-8)
- 13070001
- Coordinates
- 31.36681, -103.00599
- USGS site number
- 08437710
- Records begin
- 2007-07-13 (19 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 19 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 | 0.3 | 3.1 | 24.8 | |
| February | 0.4 | 2.6 | 35 | |
| March | 0.4 | 2.9 | 38.2 | |
| April | 0.4 | 2.8 | 47.7 | |
| May | 0.3 | 2 | 51.3 | |
| June | 0.1 | 1.6 | 44.1 | |
| July | 0 | 2.1 | 33 | |
| August | 0 | 1.5 | 30.9 | |
| September | 0.1 | 2.5 | 37.9 | |
| October | 0.1 | 6.5 | 56 | |
| November | 0.2 | 6.5 | 52 | |
| December | 0.3 | 4.1 | 44.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Pecos River at RR 1776 near Grandfalls, TX normally run highest?
- October, on the long-term record. The median daily flow that month is about 6.5 cfs, against 1.5 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Pecos River at RR 1776 near Grandfalls, TX?
- It depends on the month. In January, half of days historically fall near 3.1 cfs, with the middle 80% of days between 0.3 and 24.8 cfs. The month-by-month table on this page gives the full range.
- How long has Pecos River at RR 1776 near Grandfalls, TX been measured?
- Discharge records at USGS site 08437710 begin in 2007, about 19 years, covering roughly 6,959 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Pecos River at RR 1776 near Grandfalls, TX?
- The gauge sits at 31.36681, -103.00599, in Texas, in hydrologic subbasin 13070001, at an elevation of about 2,440 feet, draining roughly 34,740 square miles.
- Can I use Pecos River at RR 1776 near Grandfalls, TX 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.