When does Snake River at Hells Canyon Dam Id-Or State Line normally run highest?

April, on the long-term record. The median daily flow that month is about 22,360 cfs, against 9,823.7 cfs in November, 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 Hells Canyon Dam Id-Or State Line?

It depends on the month. In January, half of days historically fall near 17,577.4 cfs, with the middle 80% of days between 11,128.7 and 29,635.5 cfs. The month-by-month table on this page gives the full range.

How long has Snake River at Hells Canyon Dam Id-Or State Line been measured?

Discharge records at USGS site 13290450 begin in 1965, about 61 years, covering roughly 8,900 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.

Where is Snake River at Hells Canyon Dam Id-Or State Line?

The gauge sits at 45.25444, -116.69694, in Oregon, in hydrologic subbasin 17060101, draining roughly 73,300 square miles.

Can I use Snake River at Hells Canyon Dam Id-Or State Line 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 13290450

Snake River at Hells Canyon Dam Id-Or State Line

Snake River at Hells Canyon Dam Id-Or State Line is USGS streamgage 13290450 in Oregon, monitoring river discharge in hydrologic subbasin 17060101. It sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. It drains a watershed of about 73,300 square miles. Discharge records at this site go back to 1965. Typical flow runs near 13,041.9 cfs in July and 22,360 cfs in April, with the higher of the two arriving in April.

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Gauge details

State: Oregon
Drainage area: 73,300 sq mi
Subbasin (HUC-8): 17060101
Coordinates: 45.25444, -116.69694
USGS site number: 13290450
Records begin: 1965-07-15 (61 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 60 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	11,128.7	17,577.4	29,635.5
February	10,729.3	18,862.1	36,103.4
March	10,618.4	20,041.9	53,267.7
April	9,211.7	22,360	57,440
May	8,861.9	20,867.7	48,045.2
June	8,458.7	19,183.3	42,550
July	7,854.5	13,041.9	23,209.7
August	7,848.4	10,645.2	16,035.5
September	8,531.7	12,693.3	19,010
October	8,860	11,546.5	21,025.8
November	8,561.3	9,823.7	21,913.3
December	9,105.8	13,747.7	24,941.9

All values in cubic feet per second (cfs).

Common questions

When does Snake River at Hells Canyon Dam Id-Or State Line normally run highest?: April, on the long-term record. The median daily flow that month is about 22,360 cfs, against 9,823.7 cfs in November, 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 Hells Canyon Dam Id-Or State Line?: It depends on the month. In January, half of days historically fall near 17,577.4 cfs, with the middle 80% of days between 11,128.7 and 29,635.5 cfs. The month-by-month table on this page gives the full range.
How long has Snake River at Hells Canyon Dam Id-Or State Line been measured?: Discharge records at USGS site 13290450 begin in 1965, about 61 years, covering roughly 8,900 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is Snake River at Hells Canyon Dam Id-Or State Line?: The gauge sits at 45.25444, -116.69694, in Oregon, in hydrologic subbasin 17060101, draining roughly 73,300 square miles.
Can I use Snake River at Hells Canyon Dam Id-Or State Line 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 58,700 sq mi
Snake River at Weiser, ID 69,200 sq mi
Snake River at Hells Canyon Dam Id-Or State Line this page
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

Other gauges in this subbasin

Snake River at Johnson Bar Id-Or State Line