USGS Streamgage 09384000
Little Colorado River above Lyman Lake near St. Johns, AZ
Little Colorado River above Lyman Lake near St. Johns, AZ is USGS streamgage 09384000 in Arizona, monitoring river discharge in hydrologic subbasin 15020001. It drains a watershed of about 706 square miles. Discharge records at this site go back to 1940. Typical flow runs near 3.2 cfs in July and 26.7 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Arizona
- Drainage area
- 706 sq mi
- Gauge elevation
- 6,005 ft
- Subbasin (HUC-8)
- 15020001
- Coordinates
- 34.31502, -109.36233
- USGS site number
- 09384000
- Records begin
- 1940-04-01 (86 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 86 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 | 2.6 | 6.6 | 20.8 | |
| February | 3.1 | 8.1 | 25.7 | |
| March | 2.8 | 12.6 | 92.7 | |
| April | 1.6 | 26.7 | 259 | |
| May | 1 | 8.6 | 80.1 | |
| June | 0.1 | 3.9 | 19.5 | |
| July | 0.2 | 3.2 | 24.1 | |
| August | 0.9 | 8.5 | 51.1 | |
| September | 0.6 | 5.4 | 31.5 | |
| October | 0.6 | 3.3 | 11.9 | |
| November | 1.5 | 4.3 | 16 | |
| December | 2.3 | 5.4 | 18.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Little Colorado River above Lyman Lake near St. Johns, AZ normally run highest?
- April, on the long-term record. The median daily flow that month is about 26.7 cfs, against 3.2 cfs in July, 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 above Lyman Lake near St. Johns, AZ?
- It depends on the month. In January, half of days historically fall near 6.6 cfs, with the middle 80% of days between 2.6 and 20.8 cfs. The month-by-month table on this page gives the full range.
- How long has Little Colorado River above Lyman Lake near St. Johns, AZ been measured?
- Discharge records at USGS site 09384000 begin in 1940, about 86 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 River above Lyman Lake near St. Johns, AZ?
- The gauge sits at 34.31502, -109.36233, in Arizona, in hydrologic subbasin 15020001, at an elevation of about 6,005 feet, draining roughly 706 square miles.
- Can I use Little Colorado River above Lyman Lake 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.