Long Green Creek at Glen Arm water level

Name: Long Green Creek at Glen Arm 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, Long Green Creek, Maryland, United States

Directions

Below flood stage

Water level

1.01ft Steady over the last 24 hours

Measured Oct 20, 2026, 02:15 PM EDT (57 min ago)

Flow: 3.8 cfs

History

7 days

Water level Minor flood stage

What this means

The gauge at Long Green Creek at Glen Arm reads 1.01 ft, a normal level.

It is 5.99 ft below the flood stage of 7.00 ft.

It has barely moved over the past 24 hours. Over the past 30 days it has moved between 1.00 ft and 1.23 ft.

Fall is often low-water season on rivers, until steadier rain returns.

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

Key numbers

Highest on record: 6.70 ftJuly 1, 1984

What the stage means on the water

A normal level is usually prime time for floating and wade fishing, as long as the weather holds upstream.

The National Weather Service puts flood stage for this gauge at 7.00 ft, still 5.99 ft away.

What happens at each level

15.00 ft: Multiple spots on Hartley Mill Road are flooded.
11.50 ft: Glen Arm Road begins to flood.
11.00 ft: Hartley Mill Road begins to flood in spots.
9.50 ft: Water reaches Hillrise Avenue.
7.00 ft: Water approaches a farm road and Long Green Pike.
4.00 ft: Water begins to overflow the right bank of the creek but no impacts are observed.
1.01 ft: Right now

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

Highest crests on record

Rank	Level	Date
1	6.70 ft	July 1, 1984
2	6.43 ft	February 24, 2016
3	6.39 ft	November 16, 2006
4	6.31 ft	August 27, 1978
5	6.27 ft	July 20, 1989
6	5.84 ft	September 21, 1979
7	5.83 ft	January 19, 1996
8	5.78 ft	September 30, 2010
9	5.77 ft	June 28, 2006
10	5.59 ft	September 16, 1976

Weather at the gauge

Rain in the last 3 days: 0.03 in. Rain that falls upstream can take hours or days to show up at a river gauge.

20 Tue 68° 48° – Wind 13 mph

21 Wed 63° 44° – Wind 12 mph

22 Thu 65° 43° – Wind 14 mph

23 Fri 60° 46° – Wind 11 mph

24 Sat 60° 43° – Wind 6 mph

25 Sun 63° 47° – Wind 7 mph

26 Mon 68° 48° – Wind 6 mph

Forecast: Open-Meteo

Sunrise 07:22 AM Sunset 06:21 PM Daylight 11 hr Waxing gibbous 71%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Little Gunpowder Falls at Laurel BrookRiver gauge, Little Gunpowder Falls	1.07 ft	Below flood stage	−0.02 ft	4.3 mi
Minebank Run near Glen ArmRiver gauge, Minebank Run	4.10 ft	Below flood stage	±0	5.2 mi
Whitemarsh Run near FullertonRiver gauge, Whitemarsh Run	1.11 ft	Below flood stage	−0.02 ft	5.3 mi
Honeygo Run near White MarshRiver gauge, Honeygo Run	0.53 ft	Below flood stage	±0	5.5 mi
Whitemarsh Run at White MarshRiver gauge, Whitemarsh Run	2.89 ft	Below flood stage	−0.01 ft	6.1 mi
Long Quarter Branch at LuthervilleRiver gauge, Long Quarter Branch	1.00 ft	Below flood stage	±0	7 mi
Winters Run near Bel AirRiver gauge, Winters Run	1.29 ft	Below flood stage	−0.02 ft	7 mi
Winters Run near BensonRiver gauge, Winters Run	1.31 ft	Below flood stage	−0.01 ft	7 mi

Questions and answers

What is flood stage for Long Green Creek at Glen Arm?

The official flood stage is 7.00 ft. The level is currently 5.99 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 Long Green Creek at Glen Arm today?

On Oct 20, 2026, 02:15 PM EDT, the water level was 1.01 ft. Steady over the last 24 hours.

Is Long Green Creek at Glen Arm rising or falling?

Steady over the last 24 hours.

Is the level of Long Green Creek at Glen Arm normal?

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

What is the highest water level ever recorded at Long Green Creek at Glen Arm?

The highest level on record is 6.70 ft on July 1, 1984.

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.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01584050 (Agency page)
Coordinates: 39.45469, -76.47889 (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	1.01 ft	2026-10-20 18:15	Provisional
Flow	3.8 cfs	2026-10-20 18:15	Provisional

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How to cite

U.S. Geological Survey: Long Green Creek at Glen Arm (usgs:01584050). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/maryland/long-green-creek-at-glen-arm

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