USGS Streamgage 12415135
St Joe River at Ramsdell near St Maries, ID
St Joe River at Ramsdell near St Maries, ID is USGS streamgage 12415135 in Idaho, monitoring river discharge in hydrologic subbasin 17010304. It sits on the St Joe River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,721 square miles. Discharge records at this site go back to 2009. Typical flow runs near 1,400.3 cfs in July and 6,189.3 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
- 1,721 sq mi
- Gauge elevation
- 2,142 ft
- Subbasin (HUC-8)
- 17010304
- Coordinates
- 47.35222, -116.67556
- USGS site number
- 12415135
- Records begin
- 2009-10-01 (17 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for St Joe River at Ramsdell near St Maries, 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 |
|---|---|---|---|---|
| 278 | 317 | 369 | ||
| 264 | 316 | 398 | ||
| 274 | 343 | 474 | ||
| 275 | 364 | 517 | ||
| 262 | 355 | 515 | ||
| 264 | 350 | 492 | ||
| 249 | 329 | 462 | ||
| 253 | 338 | 492 | ||
| 256 | 352 | 548 | ||
| 242 | 338 | 552 | ||
| 238 | 336 | 549 | ||
| 235 | 333 | 534 | ||
| 221 | 311 | 489 | ||
| 212 | 303 | 481 |
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 16 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 | 649.5 | 1,397.4 | 5,117.1 | |
| February | 780.9 | 1,878.6 | 8,585.4 | |
| March | 1,412.3 | 3,901.3 | 11,670.3 | |
| April | 3,042 | 6,189.3 | 12,251.7 | |
| May | 3,425.5 | 7,660 | 14,251.6 | |
| June | 1,858.3 | 3,541.7 | 10,879.3 | |
| July | 852.3 | 1,400.3 | 3,031.6 | |
| August | 403.4 | 789.4 | 1,132.1 | |
| September | 298.6 | 487.5 | 758 | |
| October | 329.1 | 540.7 | 1,197.5 | |
| November | 465.4 | 841.4 | 2,569.7 | |
| December | 494.4 | 1,102.9 | 3,172.3 |
All values in cubic feet per second (cfs).
Common questions
- When does St Joe River at Ramsdell near St Maries, ID normally run highest?
- May, on the long-term record. The median daily flow that month is about 7,660 cfs, against 487.5 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 Joe River at Ramsdell near St Maries, ID?
- It depends on the month. In January, half of days historically fall near 1,397.4 cfs, with the middle 80% of days between 649.5 and 5,117.1 cfs. The month-by-month table on this page gives the full range.
- How long has St Joe River at Ramsdell near St Maries, ID been measured?
- Discharge records at USGS site 12415135 begin in 2009, about 17 years, covering roughly 6,148 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 Joe River at Ramsdell near St Maries, 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 Joe River at Ramsdell near St Maries, ID?
- The gauge sits at 47.35222, -116.67556, in Idaho, in hydrologic subbasin 17010304, at an elevation of about 2,142 feet, draining roughly 1,721 square miles.
- Can I use St Joe River at Ramsdell near St Maries, 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.
Upstream and downstream on the St Joe River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the St Joe River in full.
- St Joe River at Red Ives Ranger Station, ID 108 sq mi
- St Joe River at Calder, ID 1,025 sq mi
- St Joe River at Ramsdell near St Maries, ID this page