USGS Streamgage 13190500
SF Boise River at Anderson Ranch Dam, ID
SF Boise River at Anderson Ranch Dam, ID is USGS streamgage 13190500 in Idaho, monitoring river discharge in hydrologic subbasin 17050113. It sits on the Sf Boise River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 978 square miles. Discharge records at this site go back to 1943. Typical flow runs near 1,514.2 cfs in July and 770.1 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.
View live conditions & forecast →
Gauge details
- State
- Idaho
- Drainage area
- 978 sq mi
- Subbasin (HUC-8)
- 17050113
- Coordinates
- 43.34361, -115.4775
- USGS site number
- 13190500
- Records begin
- 1943-04-08 (83 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for SF Boise River at Anderson Ranch Dam, 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 |
|---|---|---|---|---|
| 536 | 602 | 628 | ||
| 506 | 595 | 624 | ||
| 474 | 590 | 625 | ||
| 442 | 588 | 631 | ||
| 408 | 584 | 636 | ||
| 333 | 570 | 639 | ||
| 249 | 537 | 640 | ||
| 173 | 473 | 633 | ||
| 161 | 461 | 634 | ||
| 139 | 435 | 633 | ||
| 117 | 416 | 638 | ||
| 134 | 420 | 632 | ||
| 128 | 411 | 631 | ||
| 134 | 416 | 633 |
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 83 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 | 190.2 | 308.5 | 1,070.1 | |
| February | 161 | 306.8 | 1,287.5 | |
| March | 132.5 | 306.7 | 1,578.4 | |
| April | 135.1 | 770.1 | 2,675.7 | |
| May | 505.2 | 1,601.9 | 4,299 | |
| June | 678.6 | 1,815.7 | 4,020.7 | |
| July | 932.3 | 1,514.2 | 1,992.9 | |
| August | 411.6 | 1,178.3 | 1,704.2 | |
| September | 207.8 | 464.7 | 1,258.1 | |
| October | 131 | 301.2 | 693 | |
| November | 180.7 | 303.4 | 729.5 | |
| December | 211.7 | 308.4 | 1,036.6 |
All values in cubic feet per second (cfs).
Common questions
- When does SF Boise River at Anderson Ranch Dam, ID normally run highest?
- June, on the long-term record. The median daily flow that month is about 1,815.7 cfs, against 301.2 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for SF Boise River at Anderson Ranch Dam, ID?
- It depends on the month. In January, half of days historically fall near 308.5 cfs, with the middle 80% of days between 190.2 and 1,070.1 cfs. The month-by-month table on this page gives the full range.
- How long has SF Boise River at Anderson Ranch Dam, ID been measured?
- Discharge records at USGS site 13190500 begin in 1943, about 83 years, covering roughly 9,201 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for SF Boise River at Anderson Ranch Dam, 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. A companion model forecasts each day's water-temperature high and low. 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 SF Boise River at Anderson Ranch Dam, ID?
- The gauge sits at 43.34361, -115.4775, in Idaho, in hydrologic subbasin 17050113, draining roughly 978 square miles.
- Can I use SF Boise River at Anderson Ranch Dam, 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 Sf Boise River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Sf Boise River in full.
- SF Boise River near Featherville, ID 641 sq mi
- SF Boise River at Anderson Ranch Dam, ID this page
- SF Boise River at Neal Bridge near Arrowrock Dam, ID 1,172 sq mi