When does Snake River at Nyssa, OR normally run highest?

April, on the long-term record. The median daily flow that month is about 13,003.3 cfs, against 7,547.1 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 Snake River at Nyssa, OR?

It depends on the month. In January, half of days historically fall near 9,491.6 cfs, with the middle 80% of days between 7,690.6 and 19,603.2 cfs. The month-by-month table on this page gives the full range.

How long has Snake River at Nyssa, OR been measured?

Discharge records at USGS site 13213100 begin in 1974, about 52 years, covering roughly 9,197 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 at Nyssa, OR?

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 at Nyssa, OR?

The gauge sits at 43.87611, -116.9825, in Idaho, in hydrologic subbasin 17050115, draining roughly 58,700 square miles.

Can I use Snake River at Nyssa, OR 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.

USGS Streamgage 13213100

Snake River at Nyssa, OR

Snake River at Nyssa, OR is USGS streamgage 13213100 in Idaho, monitoring river discharge in hydrologic subbasin 17050115. It sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. It drains a watershed of about 58,700 square miles. Discharge records at this site go back to 1974. Typical flow runs near 7,547.1 cfs in July and 13,003.3 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: 58,700 sq mi
Subbasin (HUC-8): 17050115
Coordinates: 43.87611, -116.9825
USGS site number: 13213100
Records begin: 1974-11-26 (52 years)
Rivermatics forecast: 14-day flow outlook

14-day flow forecast

Based on observations through September 10 for Snake River at Nyssa, OR. 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.

Forecast daily mean discharge in cubic feet per second, by date
Date	Low p10	Expected p50	High p90
September 11	7,509	7,829	8,155
September 12	7,296	7,820	8,285
September 13	7,080	7,785	8,425
September 14	6,893	7,740	8,561
September 15	6,774	7,708	8,675
September 16	6,697	7,699	8,769
September 17	6,679	7,697	8,786
September 18	6,667	7,750	8,974
September 19	6,644	7,780	9,070
September 20	6,571	7,777	9,141
September 21	6,480	7,767	9,231
September 22	6,401	7,779	9,374
September 23	6,304	7,752	9,426
September 24	6,205	7,721	9,480

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 52 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month	Low p10	Typical p50	High p90
January	7,690.6	9,491.6	19,603.2
February	7,624.1	9,755.5	22,000
March	7,336.8	10,741.9	29,438.7
April	6,586.3	13,003.3	37,093.3
May	6,985.5	11,735.5	35,867.7
June	5,978	9,451	28,040
July	5,372.6	7,547.1	12,569
August	5,888.1	7,676.5	10,465.5
September	7,384.3	8,979	13,023.3
October	8,304.2	9,868.4	15,532.3
November	7,992.3	9,325.3	15,183.3
December	7,897.7	9,246.8	17,306.5

All values in cubic feet per second (cfs).

Common questions

When does Snake River at Nyssa, OR normally run highest?: April, on the long-term record. The median daily flow that month is about 13,003.3 cfs, against 7,547.1 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 Snake River at Nyssa, OR?: It depends on the month. In January, half of days historically fall near 9,491.6 cfs, with the middle 80% of days between 7,690.6 and 19,603.2 cfs. The month-by-month table on this page gives the full range.
How long has Snake River at Nyssa, OR been measured?: Discharge records at USGS site 13213100 begin in 1974, about 52 years, covering roughly 9,197 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 at Nyssa, OR?: 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 at Nyssa, OR?: The gauge sits at 43.87611, -116.9825, in Idaho, in hydrologic subbasin 17050115, draining roughly 58,700 square miles.
Can I use Snake River at Nyssa, OR 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 5,225 sq mi
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 this page
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