Alameda C Flood Channel A Union City water level

Name: Alameda C Flood Channel A Union City 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, California, United States

Directions

Very high for mid-October

Water level

7.12ft Up 0.69 ft over the last 24 hours

Measured Oct 20, 2026, 11:00 PM PDT (55 min ago)

Flow: 10.4 cfs

History

7 days

Water level

What this means

The gauge at Alameda C Flood Channel A Union City shows 7.12 ft, well above normal for mid-October.

The water is rising: up 0.69 ft over the past 24 hours. If the rise continues, low-lying paths and riverside parking can go under water. Over the past 30 days it has moved between 6.42 ft and 7.13 ft.

That stands out in fall, when many rivers are usually near their lowest.

Compared with 5 years of daily readings for this time of year. How to read levels

High water at Alameda C Flood Channel A Union City

The National Weather Service splits flooding into minor, moderate and major flood stage, each tied to what starts to go under water at this particular gauge. Minor flooding usually means low roads, parks and farmland; major flooding reaches homes and businesses.

Keep children and dogs well back from the edge, and stay off flooded footpaths and towpaths.

Weather at the gauge

No rain in the last 3 days.

20 Tue 69° 53° – Wind 8 mph

21 Wed 72° 56° 0.02 in Wind 11 mph

22 Thu 70° 56° – Wind 8 mph

23 Fri 72° 57° 0.01 in Wind 8 mph

24 Sat 77° 56° – Wind 5 mph

25 Sun 80° 59° – Wind 6 mph

26 Mon 82° 60° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:23 AM Sunset 06:24 PM Daylight 11 hr, 1 min Waxing gibbous 75%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Alameda Creek near FremontRiver gauge, Alameda Creek	14.8 cfs	High	+2.0 cfs	2.9 mi
Alameda Creek near NilesRiver gauge, Alameda Creek	2.67 ft	Below flood stage	+0.02 ft	4.8 mi
San Francisco Bay A Old Dumbarton Branch near NewarkEstuary gauge, San Francisco Bay A Old Dumbarton Branch	5.38 ft	Very high	+1.57 ft	7 mi
Castro Valley C A HaywardRiver gauge	0.2 cfs	Low	±0	7 mi
San Lorenzo C A HaywardRiver gauge	2.58 ft	Below flood stage	±0	7 mi
San Lorenzo Creek above Don Castro Reservoir near Castro VRiver gauge, San Lorenzo Creek	0.3 cfs	Normal	±0	8 mi
Crow Creek near HaywardRiver gauge, Crow Creek	2.90 ft	Below flood stage	±0	8 mi
San Lorenzo C A San LorenzoRiver gauge	1.3 cfs	Normal	±0	8 mi

Questions and answers

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 Alameda C Flood Channel A Union City today?

On Oct 20, 2026, 11:00 PM PDT, the water level was 7.12 ft. Up 0.69 ft over the last 24 hours.

Is Alameda C Flood Channel A Union City rising or falling?

Up 0.69 ft over the last 24 hours.

Is the level of Alameda C Flood Channel A Union City normal?

Very high for mid-October. Compared with 5 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:11180700 (Agency page)
Coordinates: 37.58577, -122.04830 (WGS84)
Vertical datum: NAVD88
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	7.12 ft	2026-10-21 06:00	Provisional
Flow	10.4 cfs	2026-10-21 06:00	Provisional

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How to cite

U.S. Geological Survey: Alameda C Flood Channel A Union City (usgs:11180700). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/california/alameda-c-flood-channel-a-union-city

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