Rivermatics

USGS Streamgage 14183000

North Santiam River at Mehama, OR

North Santiam River at Mehama, OR is USGS streamgage 14183000 in Oregon, monitoring river discharge in hydrologic subbasin 17090005. It sits on the North Santiam River, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 654 square miles. Discharge records at this site go back to 1905. Typical flow runs near 1,266.1 cfs in July and 3,255.3 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
Oregon
Drainage area
654 sq mi
Subbasin (HUC-8)
17090005
Coordinates
44.78925, -122.61881
USGS site number
14183000
Records begin
1905-07-01 (121 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for North Santiam River at Mehama, OR. 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
1,659 1,711 1,773
1,631 1,705 1,789
1,628 1,739 1,972
1,601 1,725 1,868
1,570 1,726 1,935
1,524 1,722 1,977
1,492 1,722 1,988
1,466 1,724 2,016
1,442 1,727 2,038
1,407 1,727 2,070
1,389 1,727 2,094
1,376 1,728 2,127
1,383 1,730 2,148
1,342 1,724 2,183

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 121 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 1,759 4,337.4 10,932.6
February 1,627.9 2,993.1 9,127.9
March 1,684.2 2,911 6,699.4
April 1,840 3,255.3 6,328.3
May 1,756.8 3,481.6 6,412.9
June 1,289 2,177 4,648
July 903.6 1,266.1 1,870.3
August 660.2 1,058.1 1,408.1
September 623.2 1,534.3 2,490.7
October 683 2,305.8 4,414.2
November 1,341.5 4,047.7 9,479.3
December 1,759.4 4,376.8 11,365.2

All values in cubic feet per second (cfs).

Common questions

When does North Santiam River at Mehama, OR normally run highest?
December, on the long-term record. The median daily flow that month is about 4,376.8 cfs, against 1,058.1 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 North Santiam River at Mehama, OR?
It depends on the month. In January, half of days historically fall near 4,337.4 cfs, with the middle 80% of days between 1,759 and 10,932.6 cfs. The month-by-month table on this page gives the full range.
How long has North Santiam River at Mehama, OR been measured?
Discharge records at USGS site 14183000 begin in 1905, about 121 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for North Santiam River at Mehama, OR?
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 North Santiam River at Mehama, OR?
The gauge sits at 44.78925, -122.61881, in Oregon, in hydrologic subbasin 17090005, draining roughly 654 square miles.
Can I use North Santiam River at Mehama, OR 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 North Santiam River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the North Santiam River in full.

Other gauges in this subbasin