USGS Streamgage 09397000
Little Colorado River at Holbrook, AZ
Little Colorado River at Holbrook, AZ is USGS streamgage 09397000 in Arizona, monitoring river discharge in hydrologic subbasin 15020008. It drains a watershed of about 11,462 square miles. Discharge records at this site go back to 1905. Typical flow runs near 22.1 cfs in July and 3.8 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Arizona
- Drainage area
- 11,462 sq mi
- Gauge elevation
- 5,063 ft
- Subbasin (HUC-8)
- 15020008
- Coordinates
- 34.8978, -110.16318
- USGS site number
- 09397000
- Records begin
- 1905-03-17 (121 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 121 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 | 1.6 | 10.2 | 184.2 | |
| February | 0.7 | 10.1 | 190.5 | |
| March | 0.8 | 7.8 | 285.7 | |
| April | 0.1 | 3.8 | 167.7 | |
| May | 0 | 2.7 | 22.9 | |
| June | 0 | 1.3 | 19.1 | |
| July | 0.5 | 22.1 | 627.6 | |
| August | 1.8 | 57.6 | 1,340.5 | |
| September | 1.1 | 13.4 | 493.4 | |
| October | 1 | 6.6 | 165.7 | |
| November | 0.7 | 6.3 | 62.8 | |
| December | 1 | 8.4 | 87 |
All values in cubic feet per second (cfs).
Common questions
- When does Little Colorado River at Holbrook, AZ normally run highest?
- August, on the long-term record. The median daily flow that month is about 57.6 cfs, against 1.3 cfs in June, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Little Colorado River at Holbrook, AZ?
- It depends on the month. In January, half of days historically fall near 10.2 cfs, with the middle 80% of days between 1.6 and 184.2 cfs. The month-by-month table on this page gives the full range.
- How long has Little Colorado River at Holbrook, AZ been measured?
- Discharge records at USGS site 09397000 begin in 1905, about 121 years, covering roughly 6,204 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Little Colorado River at Holbrook, AZ?
- The gauge sits at 34.8978, -110.16318, in Arizona, in hydrologic subbasin 15020008, at an elevation of about 5,063 feet, draining roughly 11,462 square miles.
- Can I use Little Colorado River at Holbrook, AZ 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.