Rivermatics

USGS Streamgage 13022500

Snake River above Reservoir, near Alpine, WY

Snake River above Reservoir, near Alpine, WY is USGS streamgage 13022500 in Wyoming, monitoring river discharge in hydrologic subbasin 17040103. It sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. It drains a watershed of about 3,465 square miles. Discharge records at this site go back to 1937. Typical flow runs near 7,460.3 cfs in July and 2,852.7 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
Wyoming
Drainage area
3,465 sq mi
Subbasin (HUC-8)
17040103
Coordinates
43.19611, -110.88944
USGS site number
13022500
Records begin
1937-03-16 (89 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Snake River above Reservoir, near Alpine, WY. 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 Range
5,607 6,041 6,229
5,347 6,001 6,241
5,066 5,932 6,243
4,847 5,871 6,260
4,666 5,799 6,234
4,553 5,741 6,210
4,453 5,707 6,243
4,414 5,688 6,226
4,411 5,670 6,217
4,368 5,637 6,207
4,290 5,603 6,203
4,217 5,571 6,202
4,151 5,538 6,191
4,140 5,520 6,180

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 89 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 Range
January 1,145.2 1,491.3 1,942.9
February 1,173.8 1,484.5 2,025.9
March 1,200.6 1,585.8 2,696.5
April 1,702 2,852.7 5,874
May 4,505.8 8,362.3 14,522.3
June 7,292 12,293.3 20,670
July 4,591.6 7,460.3 12,793.2
August 3,386.8 5,029 7,046.5
September 2,574.7 3,940 5,587.7
October 1,541 2,065.8 2,993.9
November 1,360.3 1,741.7 2,290.7
December 1,215.5 1,591.3 2,061.9

All values in cubic feet per second (cfs).

Common questions

When does Snake River above Reservoir, near Alpine, WY normally run highest?
June, on the long-term record. The median daily flow that month is about 12,293.3 cfs, against 1,484.5 cfs in February, 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 above Reservoir, near Alpine, WY?
It depends on the month. In January, half of days historically fall near 1,491.3 cfs, with the middle 80% of days between 1,145.2 and 1,942.9 cfs. The month-by-month table on this page gives the full range.
How long has Snake River above Reservoir, near Alpine, WY been measured?
Discharge records at USGS site 13022500 begin in 1937, about 89 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 Snake River above Reservoir, near Alpine, WY?
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 Snake River above Reservoir, near Alpine, WY?
The gauge sits at 43.19611, -110.88944, in Wyoming, in hydrologic subbasin 17040103, draining roughly 3,465 square miles.
Can I use Snake River above Reservoir, near Alpine, WY 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.

Other gauges in this subbasin