How high is the South Santiam River at Waterloo, OR right now?

The South Santiam River at Waterloo, OR is currently flowing at 1,590 cubic feet per second with a gage height of 3.51 feet, based on the most recent USGS instantaneous reading.

Is the flow on the South Santiam River at Waterloo, OR normal for this time of year?

Current flow is classified as normal for October 28. Today's discharge is at the 44th percentile compared to the long-term historical record at this gauge.

Is the South Santiam River at Waterloo, OR at flood stage?

No — the gage height is 8.49 feet below the NWS flood-stage threshold of 12.0 feet.

What is the historical median flow for the South Santiam River at Waterloo, OR on October 28?

The long-term median discharge for this date is 1,840 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 279 to 5,980 cfs.

Where is the South Santiam River at Waterloo, OR stream gauge located?

The South Santiam River at Waterloo, OR stream gauge is operated by the USGS in Linn County, OR on the South Santiam River. USGS site number 14187500 (coordinates 44.4985, -122.8234).

South Santiam River at Waterloo, OR

USGS Site No: 14187500 • South Santiam River • Linn County, OR

South Santiam River at Waterloo, OR on the South Santiam River is currently at 1,590 cfs (Normal — 44th percentile for this date) . Gage height: 3.51 ft.

Reading from 4 months ago

↑ Upstream on South Santiam River

South Santiam River Near Foster, OR

1,590

CFS Discharge

3.51

Gage Height (ft)

Normal

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	279
25th	Low threshold	806
50th (Median)	Normal (median)	1,840	Today: 1,590 cfs
75th	High threshold	2,940
95th	Very High threshold	5,980

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	1,280	—
May 27, 2026	1,280	—
May 26, 2026	1,290	—
May 25, 2026	1,280	—
May 24, 2026	1,290	—
May 23, 2026	1,290	—
May 22, 2026	1,270	—
May 21, 2026	1,320	—
May 20, 2026	1,290	—
May 19, 2026	1,260	—
May 18, 2026	1,270	—
May 17, 2026	1,280	—
May 16, 2026	1,390	—
May 15, 2026	1,530	—
Apr 20, 2026	2,800	—
Apr 19, 2026	2,950	—
Apr 18, 2026	3,100	—
Apr 17, 2026	3,900	—
Apr 16, 2026	4,470	—
Apr 15, 2026	3,330	—
Apr 14, 2026	3,160	—
Apr 13, 2026	3,510	—
Apr 12, 2026	3,280	—
Apr 11, 2026	2,850	—
Apr 10, 2026	2,570	—
Apr 9, 2026	2,570	—
Apr 8, 2026	2,650	—
Apr 7, 2026	3,010	—
Apr 6, 2026	3,510	—
Apr 5, 2026	3,590	—

Station Information

USGS Site No: 14187500
State: OR
County: Linn County
Coordinates: 44.4985, -122.8234
Drainage Area: 640 mi²
Datum (ft): 370.4
HUC Code: 17090006

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 10.2 ft
Flood Stage: 12.0 ft
Moderate Flood: 14.0 ft
Major Flood: 16.0 ft

Currently 8.49 ft below flood stage.

Recent Extremes

Max discharge: 11,400 cfs

Dec 19, 2025
Min discharge: 825 cfs

Aug 21, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Willamette River at Albany, OR
17.0 mi · 6,800 cfs

Normal
Calapooia River at Albany, OR
17.2 mi · 119 cfs

Normal
Willamette River at Corvallis, OR
21.9 mi · 6,540 cfs

Low
Willamette River at Harrisburg, OR
23.4 mi · 5,840 cfs

Normal
Little North Santiam River Near Mehama, OR
23.5 mi · 180 cfs

Normal