Grass Valley Lake Tunnel Outlet A Lake Arrowhead water level

Name: Grass Valley Lake Tunnel Outlet A Lake Arrowhead 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

Low for late October

Water level

0.92ft Steady over the last 24 hours

Measured Oct 21, 2026, 02:15 AM PDT (1 hour ago)

Flow: 0.0 cfs

History

7 days

Water level

What this means

Low water at Grass Valley Lake Tunnel Outlet A Lake Arrowhead: the gauge reads 0.92 ft, below normal for late October.

It has barely moved over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. The 30-day range is 0.92 ft – 1.06 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that.

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

Paddling and fishing conditions

At low levels, plan for shorter paddling trips and expect to walk your boat through a few shoals.

Weather at the gauge

The forecast is not available right now.

Sunrise 07:00 AM Sunset 06:08 PM Daylight 11 hr, 9 min Waxing gibbous 76%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Deep Creek near HesperiaRiver gauge, Deep Creek	3.9 cfs	Normal	±0	5.9 mi
Wf Mojave River above Mojave R Forks Reservoir near HesperiaRiver gauge, Wf Mojave River	51.0 cfs	High	±0	6 mi
Waterman Canyon Creek near Arrowhead SpringsRiver gauge, Waterman Canyon Creek	0.5 cfs	Normal	±0	6 mi
East Twin Creek near Arrowhead SpringsRiver gauge, East Twin Creek	0.9 cfs	Normal	±0	7 mi
City Creek near HighlandRiver gauge, City Creek	1.7 cfs	Normal	+0.9 cfs	8 mi
Devil Canyon Creek near San BernardinoRiver gauge, Devil Canyon Creek	1.8 cfs	High	+0.1 cfs	8 mi
Plunge Creek near East HighlandsRiver gauge, Plunge Creek	6.9 cfs	Very high	−0.2 cfs	10 mi
Santa Ana River near Mentone (River Only)River gauge, Santa Ana River	0.0 cfs	Low	−0.1 cfs	12 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 Grass Valley Lake Tunnel Outlet A Lake Arrowhead today?

On Oct 21, 2026, 02:15 AM PDT, the water level was 0.92 ft. Steady over the last 24 hours.

Is Grass Valley Lake Tunnel Outlet A Lake Arrowhead rising or falling?

Steady over the last 24 hours.

Is the level of Grass Valley Lake Tunnel Outlet A Lake Arrowhead normal?

Low for late 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:10260855 (Agency page)
Coordinates: 34.26000, -117.20444 (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	0.92 ft	2026-10-21 09:15	Provisional
Flow	0.0 cfs	2026-10-21 09:15	Provisional

Download

Embed this gauge

Add a live card for this gauge to your website. It updates on its own and links back here.

<iframe src="https://nivelmap.com/embed/10219?lang=en" width="360" height="230" style="border:0;max-width:100%" loading="lazy" title="Grass Valley Lake Tunnel Outlet A Lake Arrowhead water level"></iframe>

How to cite

U.S. Geological Survey: Grass Valley Lake Tunnel Outlet A Lake Arrowhead (usgs:10260855). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/california/grass-valley-lake-tunnel-outlet-a-lake-arrowhead

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