How high is the Western Branch at Upper Marlboro, MD right now?

The Western Branch at Upper Marlboro, MD is currently flowing at 20 cubic feet per second with a gage height of 1.78 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Western Branch at Upper Marlboro, MD normal for this time of year?

Current flow is classified as normal for October 27. Today's discharge is at the 29th percentile compared to the long-term historical record at this gauge.

Is the Western Branch at Upper Marlboro, MD at flood stage?

No — the gage height is 9.22 feet below the NWS flood-stage threshold of 11.0 feet.

What is the historical median flow for the Western Branch at Upper Marlboro, MD on October 27?

The long-term median discharge for this date is 28 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 8 to 545 cfs.

Where is the Western Branch at Upper Marlboro, MD stream gauge located?

The Western Branch at Upper Marlboro, MD stream gauge is operated by the USGS in Prince George's County, MD on the Western Branch. USGS site number 01594526 (coordinates 38.8142, -76.7487).

Western Branch at Upper Marlboro, MD

USGS Site No: 01594526 • Western Branch • Prince George's County, MD

Western Branch at Upper Marlboro, MD on the Western Branch is currently at 20 cfs (Normal — 29th percentile for this date) . Gage height: 1.78 ft.

Reading from 4 months ago

CFS Discharge

1.78

Gage Height (ft)

Normal

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for October 27 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	8
25th	Low threshold	18
50th (Median)	Normal (median)	28	Today: 20 cfs
75th	High threshold	85
95th	Very High threshold	545

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	31	—
May 27, 2026	38	—
May 26, 2026	45	—
May 25, 2026	84	—
May 24, 2026	169	—
May 23, 2026	100	—
May 22, 2026	41	—
May 21, 2026	20	—
May 20, 2026	13	—
May 19, 2026	14	—
May 18, 2026	15	—
May 17, 2026	17	—
May 16, 2026	22	—
May 15, 2026	36	—
Apr 21, 2026	20	—
Apr 20, 2026	23	—
Apr 19, 2026	20	—
Apr 18, 2026	22	—
Apr 17, 2026	23	—
Apr 16, 2026	27	—
Apr 15, 2026	27	—
Apr 14, 2026	28	—
Apr 13, 2026	28	—
Apr 12, 2026	29	—
Apr 11, 2026	31	—
Apr 10, 2026	32	—
Apr 9, 2026	34	—
Apr 8, 2026	39	—
Apr 7, 2026	50	—
Apr 6, 2026	98	—

Station Information

USGS Site No: 01594526
State: MD
County: Prince George's County
Coordinates: 38.8142, -76.7487
Drainage Area: 90 mi²
Datum (ft): 4.3
HUC Code: 02060006

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 9.0 ft
Flood Stage: 11.0 ft
Moderate Flood: 16.0 ft
Major Flood: 19.0 ft

Currently 9.22 ft below flood stage.

Recent Extremes

Max discharge: 791 cfs

Jul 20, 2025
Min discharge: 11 cfs

Oct 25, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Fourmile Run at Alexandria, VA
18.3 mi · 4 cfs

Normal
Sawmill Creek at Glen Burnie, MD
25.4 mi · 3 cfs

Normal
Patapsco River Near Elkridge, MD
28.6 mi · 132 cfs

Normal
East Branch Herbert Run at Arbutus, MD
29.6 mi · 1 cfs

Normal
Patapsco River Near Catonsville, MD
30.2 mi · 123 cfs

Normal