USGS Streamgage 09386300
Little Colorado Rvr below Zion Reservoir. near St Johns, AZ
Little Colorado Rvr below Zion Reservoir. near St Johns, AZ is USGS streamgage 09386300 in Arizona, monitoring river discharge in hydrologic subbasin 15020002. It drains a watershed of about 1,171 square miles. Discharge records at this site go back to 1998. Typical flow runs near 0 cfs in July and 0 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Drainage area
- 1,171 sq mi
- Gauge elevation
- 5,530 ft
- Subbasin (HUC-8)
- 15020002
- Coordinates
- 34.60475, -109.48927
- USGS site number
- 09386300
- Records begin
- 1998-09-11 (28 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 28 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 | 0 | 0.5 | |
| February | 0 | 0 | 0.2 | |
| March | 0 | 0 | 0.1 | |
| April | 0 | 0 | 0 | |
| May | 0 | 0 | 0 | |
| June | 0 | 0 | 0 | |
| July | 0 | 0 | 5.4 | |
| August | 0 | 0 | 45.5 | |
| September | 0 | 0 | 6.5 | |
| October | 0 | 0 | 5.1 | |
| November | 0 | 0 | 3.3 | |
| December | 0 | 0 | 0.5 |
All values in cubic feet per second (cfs).
Common questions
- When does Little Colorado Rvr below Zion Reservoir. near St Johns, AZ normally run highest?
- January, on the long-term record. The median daily flow that month is about 0 cfs, against 0 cfs in January, 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 Rvr below Zion Reservoir. near St Johns, AZ?
- It depends on the month. In January, half of days historically fall near 0 cfs, with the middle 80% of days between 0 and 0.5 cfs. The month-by-month table on this page gives the full range.
- How long has Little Colorado Rvr below Zion Reservoir. near St Johns, AZ been measured?
- Discharge records at USGS site 09386300 begin in 1998, about 28 years, covering roughly 9,126 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Little Colorado Rvr below Zion Reservoir. near St Johns, AZ?
- The gauge sits at 34.60475, -109.48927, in Arizona, in hydrologic subbasin 15020002, at an elevation of about 5,530 feet, draining roughly 1,171 square miles.
- Can I use Little Colorado Rvr below Zion Reservoir. near St Johns, 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.