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 sits on the Little Colorado River, alongside 8 other gauges Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
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)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Little Colorado River above Lyman Lake near St. Johns, AZ. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 2.3 | 6 | 20.8 | ||
| 1.4 | 6.4 | 41 | ||
| 1 | 5.4 | 33.9 | ||
| 0.6 | 3.7 | 22.1 | ||
| 0.3 | 2.1 | 10.2 | ||
| 0.2 | 1.5 | 5.9 | ||
| 0.2 | 1.3 | 4.9 | ||
| 0.1 | 1.1 | 4.2 | ||
| 0.1 | 1 | 4.1 | ||
| 0 | 0.9 | 3.5 | ||
| 0 | 0.9 | 4.1 | ||
| 0 | 0.9 | 5.1 | ||
| 0 | 0.8 | 4.2 | ||
| 0 | 0.6 | 3.3 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
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 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Little Colorado River above Lyman Lake near St. Johns, AZ?
- Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
- 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.
Upstream and downstream on the Little Colorado River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Little Colorado River in full.
- Little Colorado River at Greer, AZ 29 sq mi
- Little Colorado River above Lyman Lake near St. Johns, AZ this page
- Little Colorado River below Salado Springs, AZ 845 sq mi
- Little Colorado River at Woodruff, AZ 8,072 sq mi
- Little Colorado River at Holbrook, AZ 11,462 sq mi
- Little Colorado River near Joseph City, AZ 12,384 sq mi
- Little Colorado River near Winslow, AZ 16,192 sq mi
- Little Colorado River near Cameron, AZ 26,459 sq mi
- Little Colorado River above Mouth near Desert View, AZ 26,972 sq mi