TornadoLiveMap

Long Green Creek at Glen Arm — water level right now

Baltimore County, Maryland · NWS gauge GALM2
Loading the latest reading…
–
current stage (ft)
 
7
minor flood stage
 
6.7
record crest
set 1984-07-01
–
flood status
official NWS category
Official NOAA forecast → USGS data → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 4
minor · 7
moderate · 10
major · 15
Flood stageLevel (ft)What it means
Major flood stage15extensive inundation and significant evacuations — a serious event
Moderate flood stage10some buildings and roads inundated; evacuations possible
Minor flood stage7low-lying roads and fields near the river start to flood
Action stage4water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
16.71984-07-010.3 below
26.432016-02-240.57 below
36.392006-11-160.61 below
46.311978-08-270.69 below
56.271989-07-200.73 below
65.841979-09-211.16 below
75.831996-01-191.17 below
85.782010-09-301.22 below
95.772006-06-281.23 below
105.591976-09-161.41 below
115.531999-09-161.47 below
125.511993-07-191.49 below

Historic crests recorded at this gauge by the National Weather Service — the 12 highest on file.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

Little Gunpowder Falls at Laurel Brook 4 mi away · loading… Minebank Run near Glen Arm 5 mi away · loading… Whitemarsh Run near Fullerton 5 mi away · loading… Honeygo Run near White Marsh 6 mi away · loading… Whitemarsh Run at White Marsh 6 mi away · loading… Long Quarter Branch at Lutherville 7 mi away · loading…

Gauge details

NWS gauge IDGALM2
USGS site01584050
CountyBaltimore
StateMaryland
NWS forecast officeSterling
River forecast centerMiddle Atlantic River Forecast Center
Coordinates39.455, -76.479
Time zoneEST5EDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about Long Green Creek at Glen Arm

Is Long Green Creek at Glen Arm flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 7 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

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

major flood stage 15 ft, moderate flood stage 10 ft, minor flood stage 7 ft, action stage 4 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at Long Green Creek at Glen Arm?

The highest crest on file at this gauge is 6.7 ft, reached on 1984-07-01 — that is -0.3 ft above minor flood stage. The full list of the highest crests is in the table on this page.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Sterling and local emergency management.