How high is the Patuxent River Near Unity, MD right now?

The Patuxent River Near Unity, MD is currently flowing at 24 cubic feet per second with a gage height of 2.19 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Patuxent River Near Unity, MD normal for this time of year?

Current flow is classified as high for October 27. Today's discharge is at the 76th percentile compared to the long-term historical record at this gauge.

Is the Patuxent River Near Unity, MD at flood stage?

No — the gage height is 5.81 feet below the NWS flood-stage threshold of 8.0 feet.

What is the historical median flow for the Patuxent River Near Unity, MD on October 27?

The long-term median discharge for this date is 16 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 8 to 86 cfs.

Where is the Patuxent River Near Unity, MD stream gauge located?

The Patuxent River Near Unity, MD stream gauge is operated by the USGS in Montgomery County, MD on the Patuxent River. USGS site number 01591000 (coordinates 39.2383, -77.0557).

Patuxent River Near Unity, MD

USGS Site No: 01591000 • Patuxent River • Montgomery County, MD

Patuxent River Near Unity, MD on the Patuxent River is currently at 24 cfs (High — 76th percentile for this date) . Gage height: 2.19 ft.

Reading from 4 months ago

Downstream on Patuxent River ↓

Patuxent River Below Brighton Dam Near Brighton MD

CFS Discharge

2.19

Gage Height (ft)

High

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	11
50th (Median)	Normal (median)	16
75th	High threshold	21
95th	Very High threshold	86	Today: 24 cfs

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	35	—
May 27, 2026	41	—
May 26, 2026	33	—
May 25, 2026	47	—
May 24, 2026	141	—
May 23, 2026	93	—
May 22, 2026	19	—
May 21, 2026	17	—
May 20, 2026	12	—
May 19, 2026	12	—
May 18, 2026	12	—
May 17, 2026	13	—
May 16, 2026	13	—
May 15, 2026	14	—
Apr 21, 2026	15	—
Apr 20, 2026	16	—
Apr 19, 2026	16	—
Apr 18, 2026	15	—
Apr 17, 2026	15	—
Apr 16, 2026	16	—
Apr 15, 2026	18	—
Apr 14, 2026	17	—
Apr 13, 2026	17	—
Apr 12, 2026	17	—
Apr 11, 2026	18	—
Apr 10, 2026	19	—
Apr 9, 2026	19	—
Apr 8, 2026	20	—
Apr 7, 2026	21	—
Apr 6, 2026	25	—

Station Information

USGS Site No: 01591000
State: MD
County: Montgomery County
Coordinates: 39.2383, -77.0557
Drainage Area: 35 mi²
Datum (ft): 364.0
HUC Code: 02060006

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 7.0 ft
Flood Stage: 8.0 ft
Moderate Flood: 11.0 ft
Major Flood: 18.0 ft

Currently 5.81 ft below flood stage.

Recent Extremes

Max discharge: 332 cfs

Jun 18, 2025
Min discharge: 6 cfs

Sep 15, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Patapsco River at Hollofield, MD
14.9 mi · 92 cfs

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

Normal
Morgan Run Near Louisville, MD
15.7 mi · 22 cfs

Normal
Dead Run Near Catonsville, MD
17.1 mi · 0 cfs

Normal
Dead Run Tributary Near Woodlawn, MD
17.2 mi · 0 cfs

Normal