USGS Streamgage 11439999
Alder C near White Hall (Creek Only), CA
Alder C near White Hall (Creek Only), CA is USGS streamgage 11439999 in California, monitoring river discharge in hydrologic subbasin 18020129. It drains a watershed of about 22 square miles. Discharge records at this site go back to 1970. Typical flow runs near 3.7 cfs in July and 77 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- California
- Drainage area
- 22 sq mi
- Gauge elevation
- 3,844 ft
- Subbasin (HUC-8)
- 18020129
- Coordinates
- 38.75583, -120.37333
- USGS site number
- 11439999
- Records begin
- 1970-10-01 (56 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 55 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 | 0.1 | 16.6 | 175.8 | |
| February | 0.8 | 29.8 | 138.7 | |
| March | 4.6 | 53.2 | 149.5 | |
| April | 7.7 | 77 | 155.8 | |
| May | 3.7 | 40.5 | 142.6 | |
| June | 0.9 | 10.7 | 42.3 | |
| July | 0.7 | 3.7 | 8.2 | |
| August | 0.3 | 1.7 | 4.9 | |
| September | 0.2 | 1.2 | 4.6 | |
| October | 0.1 | 0.7 | 8.9 | |
| November | 0 | 1.4 | 16.4 | |
| December | 0 | 4.4 | 54.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Alder C near White Hall (Creek Only), CA normally run highest?
- April, on the long-term record. The median daily flow that month is about 77 cfs, against 0.7 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Alder C near White Hall (Creek Only), CA?
- It depends on the month. In January, half of days historically fall near 16.6 cfs, with the middle 80% of days between 0.1 and 175.8 cfs. The month-by-month table on this page gives the full range.
- How long has Alder C near White Hall (Creek Only), CA been measured?
- Discharge records at USGS site 11439999 begin in 1970, about 56 years, covering roughly 2,956 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Alder C near White Hall (Creek Only), CA?
- The gauge sits at 38.75583, -120.37333, in California, in hydrologic subbasin 18020129, at an elevation of about 3,844 feet, draining roughly 22 square miles.
- Can I use Alder C near White Hall (Creek Only), CA 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.