Alsea River near Tidewater water level

Name: Alsea River near Tidewater water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Alsea River, Oregon, United States

Directions

Below flood stage

Water level

1.12ft Steady over the last 24 hours

Measured Oct 18, 2026, 06:00 AM PDT (60 min ago)

Flow: 67.0 cfs
Water temperature: 54 °F

History

7 days

Water level Forecast Minor flood stage

The forecast expects the river to rise to 1.41 ft by Tuesday, October 27 at 05:00 AM. Issued Saturday, October 17 at 08:36 AM by NOAA National Weather Service.

What this means

The Alsea River near Tidewater is at 1.12 ft, in the normal range.

It is 16.88 ft below the flood stage of 18.00 ft.

The level has held steady over the past 24 hours. The forecast expects the river to rise to 1.41 ft by Tuesday, October 27 at 05:00 AM. In the last month it has stayed between 1.11 ft and 1.13 ft.

The sensor also reports a water temperature of 54 °F.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 29.50 ftFebruary 3, 1890
Forecast peak: 1.41 ftTuesday, October 27 at 05:00 AM

Floating and fishing near Alsea River near Tidewater

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 18.00 ft, 16.88 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

28.50 ft: the flow is about 45,000 cfs and has a 1 percent chance of being exceeded in a given year (aka the 100-year flood).
27.20 ft: the flow is about 41,000 cfs and has a 2 percent chance of being exceeded in any given year (aka the 50-year flood).
25.50 ft: the flow is about 37,000 cfs and has a 4 percent chance of being exceeded in any give year (aka the 25-year flood).
24.00 ft: expect flooding of numerous homes in the Little Albany area along with widespread flooding of numerous roads and structures along the river.
23.00 ft: flooding begins at 'Alsea Riviera' and 'Little Albany' between Milepost 8 and 10 near Tidewater along State Hwy 34. Widespread lowland and pasture flooding will also continue. At this level, the flow is about 31,000 cfs and has a 10 percent chance of being exceeded in any given year (aka the 10-year flood).
21.50 ft: the flow is about 27,000 cfs and has a 20 percent chance of being exceeded in a given year (aka 5-year flood).
21.00 ft: expect widespread flooding along the Alsea. Flood waters will likely inundate property around homes and structures in communities along the Alsea, such as Tidewater, Alsea Riviera, Little Switzerland, and Little Albany. Erosion along the Alsea and tributary creeks may also cause localized damage.
20.00 ft: water begins to surround houses at the 'Little Albany' community on Highway 34 near Milepost 8. Widespread pasture and dairy land flooding can be expected. Flooding of numerous roads along and near the river occurs at this level.
18.00 ft: expect minor flooding of low-lying pasture land, roads, and a few structures close to the river. The flow
1.12 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Chance of at least minor flooding in October to December: 8 %.

Rank	Level	Date
1	29.50 ft	February 3, 1890
2	27.44 ft	December 22, 1964
3	25.71 ft	January 21, 1972
4	24.55 ft	January 16, 1974
5	24.04 ft	December 28, 1998
6	24.02 ft	November 4, 1960
7	23.92 ft	December 26, 1980
8	23.88 ft	February 7, 1996
9	23.80 ft	December 21, 1955
10	23.61 ft	January 19, 2012

Weather at the gauge

The forecast is not available right now.

Sunrise 07:35 AM Sunset 06:27 PM Daylight 10 hr, 53 min First quarter 50%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
East Fork Lobster Creek near AlseaRiver gauge, East Fork Lobster Creek	1.2 cfs	Normal	±0	14 mi
Siuslaw River near MapletonRiver gauge, Siuslaw River	2.87 ft	Below flood stage	±0	23 mi
Siletz River at SiletzRiver gauge, Siletz River	2.15 ft	Below flood stage	±0	23 mi
Marys River near PhilomathRiver gauge, Marys River	1.93 ft	Below flood stage	−0.01 ft	26 mi
Long Tom River at MonroeRiver gauge, Long Tom River	5.24 ft	Below flood stage	+0.26 ft	27 mi
Long Tom River near NotiRiver gauge, Long Tom River	14.7 cfs	Low	−0.5 cfs	31 mi
Willamette River at CorvallisRiver gauge, Willamette River	10.11 ft	Below flood stage	+0.10 ft	31 mi
Long Tom River near AlvadoreRiver gauge, Long Tom River	356 cfs	Low	−53.0 cfs	32 mi

Questions and answers

What is flood stage for the Alsea River near Tidewater?

The official flood stage is 18.00 ft. The level is currently 16.88 ft below it.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Alsea River near Tidewater today?

On Oct 18, 2026, 06:00 AM PDT, the water level was 1.12 ft. Steady over the last 24 hours.

Is Alsea River near Tidewater rising or falling?

Steady over the last 24 hours.

Is the level of Alsea River near Tidewater normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Alsea River near Tidewater?

The highest level on record is 29.50 ft on February 3, 1890.

Is Alsea River near Tidewater expected to rise?

The forecast expects the river to rise to 1.41 ft by Tuesday, October 27 at 05:00 AM.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:14306500 (Agency page)
Coordinates: 44.38595, -123.83178 (WGS84)
Vertical datum: NGVD29
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	1.12 ft	2026-10-18 13:00	Provisional
Flow	67.0 cfs	2026-10-18 13:00	Provisional
Water temperature	54 °F	2026-10-18 13:00	Provisional

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How to cite

U.S. Geological Survey: Alsea River near Tidewater (usgs:14306500). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/oregon/alsea-river-near-tidewater

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer