Rivermatics

USGS Streamgage 13010065

Snake River Ab Jackson Lake at Flagg Ranch, WY

Snake River Ab Jackson Lake at Flagg Ranch, WY is USGS streamgage 13010065 in Wyoming, monitoring river discharge in hydrologic subbasin 17040101. It sits on the Snake River, alongside 30 other gauges Rivermatics tracks on the same river. It drains a watershed of about 486 square miles. Discharge records at this site go back to 1983. Typical flow runs near 674.5 cfs in July and 596.1 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
Wyoming
Drainage area
486 sq mi
Gauge elevation
6,831 ft
Subbasin (HUC-8)
17040101
Coordinates
44.09889, -110.6675
USGS site number
13010065
Records begin
1983-10-01 (43 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Snake River Ab Jackson Lake at Flagg Ranch, 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
205 215 224
201 212 223
196 208 220
193 206 220
190 203 217
187 201 216
186 201 218
183 200 217
181 198 216
177 195 214
175 193 213
172 191 213
171 190 214
168 188 211

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 43 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 265.8 323.3 438.1
February 268.5 314.5 432.6
March 276.9 335.7 445.9
April 379.7 596.1 1,241.5
May 1,349.9 2,669 5,371
June 941.8 2,655 5,662.7
July 320.9 674.5 1,563.5
August 206.5 359.3 607.5
September 180.9 306.5 475.5
October 205.7 330.2 475.3
November 233 323.3 488.6
December 250.6 325 459

All values in cubic feet per second (cfs).

Common questions

When does Snake River Ab Jackson Lake at Flagg Ranch, WY normally run highest?
May, on the long-term record. The median daily flow that month is about 2,669 cfs, against 306.5 cfs in September, 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 Ab Jackson Lake at Flagg Ranch, WY?
It depends on the month. In January, half of days historically fall near 323.3 cfs, with the middle 80% of days between 265.8 and 438.1 cfs. The month-by-month table on this page gives the full range.
How long has Snake River Ab Jackson Lake at Flagg Ranch, WY been measured?
Discharge records at USGS site 13010065 begin in 1983, about 43 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 Ab Jackson Lake at Flagg Ranch, 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 Ab Jackson Lake at Flagg Ranch, WY?
The gauge sits at 44.09889, -110.6675, in Wyoming, in hydrologic subbasin 17040101, at an elevation of about 6,831 feet, draining roughly 486 square miles.
Can I use Snake River Ab Jackson Lake at Flagg Ranch, 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