Rivermatics

USGS Streamgage 10338700

Donner C at Hwy 89 near Truckee, CA

Donner C at Hwy 89 near Truckee, CA is USGS streamgage 10338700 in California, monitoring river discharge in hydrologic subbasin 16050102. It drains a watershed of about 29 square miles. Discharge records at this site go back to 1993. Typical flow runs near 13.3 cfs in July and 123.8 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
California
Drainage area
29 sq mi
Gauge elevation
5,871 ft
Subbasin (HUC-8)
16050102
Coordinates
39.32099, -120.20795
USGS site number
10338700
Records begin
1993-03-24 (33 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Donner C at Hwy 89 near Truckee, CA. 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
6.8 7.2 9.8
6.6 7.1 16
6.4 7.2 21.6
6.2 7.3 29.5
6.1 7.5 36.4
5.9 7.7 42.6
5.8 7.9 51.7
5.7 7.9 58.6
5.6 8 61.8
5.5 8.1 54
6.4 9.9 28.9
6.1 9.8 39.5
6 9.4 37.1
5.7 9.1 44.2

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 33 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 9.1 30.1 159.9
February 15 50.5 149.1
March 22.6 74 189
April 38.4 123.8 290.9
May 55.9 179.8 452.7
June 15.8 77.1 358
July 5.1 13.3 88.8
August 3.7 6.1 17.9
September 4.4 32 94.5
October 4.5 19.1 97
November 5.2 18.3 78.3
December 7.9 22.3 130.4

All values in cubic feet per second (cfs).

Common questions

When does Donner C at Hwy 89 near Truckee, CA normally run highest?
May, on the long-term record. The median daily flow that month is about 179.8 cfs, against 6.1 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Donner C at Hwy 89 near Truckee, CA?
It depends on the month. In January, half of days historically fall near 30.1 cfs, with the middle 80% of days between 9.1 and 159.9 cfs. The month-by-month table on this page gives the full range.
How long has Donner C at Hwy 89 near Truckee, CA been measured?
Discharge records at USGS site 10338700 begin in 1993, about 33 years, covering roughly 9,130 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Donner C at Hwy 89 near Truckee, CA?
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 Donner C at Hwy 89 near Truckee, CA?
The gauge sits at 39.32099, -120.20795, in California, in hydrologic subbasin 16050102, at an elevation of about 5,871 feet, draining roughly 29 square miles.
Can I use Donner C at Hwy 89 near Truckee, CA 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