Rivermatics

USGS Streamgage 12175500

Thunder Creek near Newhalem, WA

Thunder Creek near Newhalem, WA is USGS streamgage 12175500 in Washington, monitoring river discharge in hydrologic subbasin 17110005. It drains a watershed of about 105 square miles. Discharge records at this site go back to 1930. Typical flow runs near 1,242.9 cfs in July and 318.5 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.

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Gauge details

State
Washington
Drainage area
105 sq mi
Gauge elevation
1,230 ft
Subbasin (HUC-8)
17110005
Coordinates
48.67263, -121.0729
USGS site number
12175500
Records begin
1930-10-01 (96 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Thunder Creek near Newhalem, WA. 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
439 492 539
402 488 583
387 483 604
340 444 569
312 413 531
289 388 503
272 375 499
264 380 523
275 406 568
280 422 596
265 403 571
264 393 557
267 396 561
254 385 549

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 96 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 105.8 187.5 498.3
February 97.2 165.9 440.5
March 108.8 179.3 393.7
April 179.5 318.5 681.3
May 429.9 783.1 1,552.6
June 725.2 1,213 1,999
July 847.5 1,242.9 1,866.1
August 652.3 934.5 1,372.9
September 341.6 569.6 936.5
October 179.8 335.6 818.1
November 136 282.2 853.5
December 124.5 225.2 585.2

All values in cubic feet per second (cfs).

Common questions

When does Thunder Creek near Newhalem, WA normally run highest?
July, on the long-term record. The median daily flow that month is about 1,242.9 cfs, against 165.9 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 Thunder Creek near Newhalem, WA?
It depends on the month. In January, half of days historically fall near 187.5 cfs, with the middle 80% of days between 105.8 and 498.3 cfs. The month-by-month table on this page gives the full range.
How long has Thunder Creek near Newhalem, WA been measured?
Discharge records at USGS site 12175500 begin in 1930, about 96 years, covering roughly 9,196 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Thunder Creek near Newhalem, WA?
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 Thunder Creek near Newhalem, WA?
The gauge sits at 48.67263, -121.0729, in Washington, in hydrologic subbasin 17110005, at an elevation of about 1,230 feet, draining roughly 105 square miles.
Can I use Thunder Creek near Newhalem, WA 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.

Other gauges in this subbasin