USGS Streamgage 12039005
Humptulips River below Hwy 101 near Humptulips, WA
Humptulips River below Hwy 101 near Humptulips, WA is USGS streamgage 12039005 in Washington, monitoring river discharge in hydrologic subbasin 17100105. It drains a watershed of about 132 square miles. Discharge records at this site go back to 2002. Typical flow runs near 221.8 cfs in July and 1,140.9 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 132 sq mi
- Gauge elevation
- 106 ft
- Subbasin (HUC-8)
- 17100105
- Coordinates
- 47.23148, -123.97406
- USGS site number
- 12039005
- Records begin
- 2002-07-20 (24 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 24 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 | 770.5 | 2,077.7 | 8,056.5 | |
| February | 622.3 | 1,283.4 | 3,920 | |
| March | 631.8 | 1,529.7 | 4,395.8 | |
| April | 585.5 | 1,140.9 | 2,762.7 | |
| May | 313.7 | 596 | 1,482.8 | |
| June | 189.2 | 372.6 | 838.4 | |
| July | 132.7 | 221.8 | 440.2 | |
| August | 107 | 157.8 | 397.3 | |
| September | 115.6 | 188.5 | 821.5 | |
| October | 154.4 | 700 | 3,371.9 | |
| November | 595.6 | 1,873 | 6,881.3 | |
| December | 667.6 | 1,861.9 | 6,327.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Humptulips River below Hwy 101 near Humptulips, WA normally run highest?
- January, on the long-term record. The median daily flow that month is about 2,077.7 cfs, against 157.8 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 Humptulips River below Hwy 101 near Humptulips, WA?
- It depends on the month. In January, half of days historically fall near 2,077.7 cfs, with the middle 80% of days between 770.5 and 8,056.5 cfs. The month-by-month table on this page gives the full range.
- How long has Humptulips River below Hwy 101 near Humptulips, WA been measured?
- Discharge records at USGS site 12039005 begin in 2002, about 24 years, covering roughly 8,127 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Humptulips River below Hwy 101 near Humptulips, WA?
- The gauge sits at 47.23148, -123.97406, in Washington, in hydrologic subbasin 17100105, at an elevation of about 106 feet, draining roughly 132 square miles.
- Can I use Humptulips River below Hwy 101 near Humptulips, WA 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.