USGS Streamgage 13032500
Snake River near Irwin, ID
Snake River near Irwin, ID is USGS streamgage 13032500 in Idaho, monitoring river discharge in hydrologic subbasin 17040104. It sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. It drains a watershed of about 5,225 square miles. Discharge records at this site go back to 1934. Typical flow runs near 12,616.1 cfs in July and 4,714.3 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.
View live conditions & forecast →
Gauge details
- State
- Idaho
- Drainage area
- 5,225 sq mi
- Subbasin (HUC-8)
- 17040104
- Coordinates
- 43.35083, -111.21889
- USGS site number
- 13032500
- Records begin
- 1934-05-09 (92 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Snake River near Irwin, 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 |
|---|---|---|---|---|
| 6,426 | 7,066 | 7,357 | ||
| 6,238 | 7,027 | 7,371 | ||
| 6,069 | 7,015 | 7,441 | ||
| 5,910 | 7,009 | 7,498 | ||
| 5,809 | 6,980 | 7,512 | ||
| 5,655 | 6,923 | 7,510 | ||
| 5,455 | 6,879 | 7,536 | ||
| 5,410 | 6,848 | 7,540 | ||
| 5,337 | 6,790 | 7,525 | ||
| 5,295 | 6,754 | 7,532 | ||
| 5,130 | 6,691 | 7,526 | ||
| 5,046 | 6,657 | 7,537 | ||
| 4,954 | 6,609 | 7,520 | ||
| 4,793 | 6,539 | 7,496 |
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 91 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 | 905.6 | 1,528.1 | 3,477.1 | |
| February | 888.4 | 1,529.3 | 4,096.6 | |
| March | 895.3 | 1,884.2 | 8,413.2 | |
| April | 1,437.9 | 4,714.3 | 14,176.7 | |
| May | 7,009 | 11,580 | 17,541.9 | |
| June | 9,927 | 13,366.7 | 21,250 | |
| July | 10,266.8 | 12,616.1 | 16,445.2 | |
| August | 7,250.6 | 9,156.5 | 11,264.5 | |
| September | 4,541 | 6,856 | 8,757 | |
| October | 1,887.7 | 3,259 | 4,747.7 | |
| November | 891.3 | 1,634 | 3,339 | |
| December | 902.3 | 1,446.8 | 3,539.4 |
All values in cubic feet per second (cfs).
Common questions
- When does Snake River near Irwin, ID normally run highest?
- June, on the long-term record. The median daily flow that month is about 13,366.7 cfs, against 1,446.8 cfs in December, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Snake River near Irwin, ID?
- It depends on the month. In January, half of days historically fall near 1,528.1 cfs, with the middle 80% of days between 905.6 and 3,477.1 cfs. The month-by-month table on this page gives the full range.
- How long has Snake River near Irwin, ID been measured?
- Discharge records at USGS site 13032500 begin in 1934, about 92 years, covering roughly 9,198 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Snake River near Irwin, 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 Snake River near Irwin, ID?
- The gauge sits at 43.35083, -111.21889, in Idaho, in hydrologic subbasin 17040104, draining roughly 5,225 square miles.
- Can I use Snake River near Irwin, 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 Snake River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Snake River in full.
- Snake River Ab Jackson Lake at Flagg Ranch, WY 486 sq mi
- Snake River near Moran, WY 807 sq mi
- Snake River at Moose, WY 1,674 sq mi
- Snake River below Flat Creek, near Jackson, WY 2,672 sq mi
- Snake River above Reservoir, near Alpine, WY 3,465 sq mi
- Snake River near Irwin, ID this page
- Snake River near Heise, ID 5,752 sq mi
- Snake River at Lorenzo, ID 5,810 sq mi
- Snake River Ab Eagle Rock near Idaho Falls, ID 9,533 sq mi
- Snake River near Shelley, ID 9,790 sq mi
- Snake River at Blackfoot, ID 9,950 sq mi
- Snake River near Blackfoot, ID 11,310 sq mi
- Snake River at Neeley, ID 13,600 sq mi
- Snake River near Minidoka Id at Howells Ferry 15,700 sq mi
- Snake River near Kimberly, ID 22,340 sq mi
- Snake River near Twin Falls, ID 22,360 sq mi
- Snake River at Pigeon Cove near Twin Falls, ID 22,830 sq mi
- Snake River near Buhl, ID 22,990 sq mi
- Snake River below Lower Salmon Falls near Hagerman, ID 26,070 sq mi
- Snake River below Bliss Dam near Bliss, ID 35,500 sq mi
- Snake River at King Hill, ID 35,800 sq mi
- Snake River below Swan Falls Dam, ID 41,900 sq mi
- Snake River near Murphy, ID 41,900 sq mi
- Snake River at Nyssa, OR 58,700 sq mi
- Snake River at Weiser, ID 69,200 sq mi
- Snake River at Hells Canyon Dam Id-Or State Line 73,300 sq mi
- Snake River at Johnson Bar Id-Or State Line 73,400 sq mi
- Snake River near Anatone, WA 92,960 sq mi
- Snake River at McDuff Rapids at China Garden, ID
- Snake River near Menan, ID
- Snake River near Powers, WA