USGS Streamgage 12414900
St Maries River near Santa, ID
St Maries River near Santa, ID is USGS streamgage 12414900 in Idaho, monitoring river discharge in hydrologic subbasin 17010304. It drains a watershed of about 273 square miles. Discharge records at this site go back to 1965. Typical flow runs near 103.6 cfs in July and 733.6 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
- Idaho
- Drainage area
- 273 sq mi
- Gauge elevation
- 2,582 ft
- Subbasin (HUC-8)
- 17010304
- Coordinates
- 47.17611, -116.49333
- USGS site number
- 12414900
- Records begin
- 1965-10-01 (61 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for St Maries River near Santa, ID. 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 |
|---|---|---|---|---|
| 43.5 | 45.4 | 48.3 | ||
| 40.8 | 43.2 | 46.1 | ||
| 42.4 | 47.9 | 59.9 | ||
| 45.7 | 55.4 | 77.6 | ||
| 43.4 | 50.4 | 64 | ||
| 41.4 | 46.6 | 55.4 | ||
| 40.1 | 44.5 | 51.2 | ||
| 38.7 | 42.9 | 49 | ||
| 37.6 | 41.5 | 47 | ||
| 37.1 | 40.9 | 46.2 | ||
| 36.4 | 40.2 | 45.4 | ||
| 35.9 | 39.7 | 44.7 | ||
| 35.5 | 39.3 | 44.2 | ||
| 35 | 38.8 | 43.8 |
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 61 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 | 74.8 | 194.1 | 771.5 | |
| February | 119.8 | 290.2 | 1,107.2 | |
| March | 222.4 | 586.5 | 1,397.7 | |
| April | 333.1 | 733.6 | 1,594.3 | |
| May | 254.1 | 583.5 | 1,424.5 | |
| June | 129.7 | 267.3 | 733.7 | |
| July | 62.3 | 103.6 | 186.7 | |
| August | 39.4 | 60 | 94.9 | |
| September | 36.5 | 53.7 | 86.4 | |
| October | 43.1 | 61.2 | 112.4 | |
| November | 49.6 | 96.1 | 271.8 | |
| December | 57.2 | 122.7 | 517.7 |
All values in cubic feet per second (cfs).
Common questions
- When does St Maries River near Santa, ID normally run highest?
- April, on the long-term record. The median daily flow that month is about 733.6 cfs, against 53.7 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for St Maries River near Santa, ID?
- It depends on the month. In January, half of days historically fall near 194.1 cfs, with the middle 80% of days between 74.8 and 771.5 cfs. The month-by-month table on this page gives the full range.
- How long has St Maries River near Santa, ID been measured?
- Discharge records at USGS site 12414900 begin in 1965, about 61 years, covering roughly 9,199 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for St Maries River near Santa, ID?
- 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 St Maries River near Santa, ID?
- The gauge sits at 47.17611, -116.49333, in Idaho, in hydrologic subbasin 17010304, at an elevation of about 2,582 feet, draining roughly 273 square miles.
- Can I use St Maries River near Santa, ID 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.