How high is the Susquehanna River at Marietta, PA right now?

The Susquehanna River at Marietta, PA is currently flowing at 56,300 cubic feet per second with a gage height of 38.72 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Susquehanna River at Marietta, PA normal for this time of year?

Current flow is classified as high for June 11. Today's discharge is at the 88th percentile compared to the long-term historical record at this gauge.

Is the Susquehanna River at Marietta, PA at flood stage?

No — the gage height is 10.28 feet below the NWS flood-stage threshold of 49.0 feet.

What is the historical median flow for the Susquehanna River at Marietta, PA on June 11?

The long-term median discharge for this date is 23,100 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 11,500 to 70,300 cfs.

Where is the Susquehanna River at Marietta, PA stream gauge located?

The Susquehanna River at Marietta, PA stream gauge is operated by the USGS in Lancaster County, PA on the Susquehanna River. USGS site number 01576000 (coordinates 40.0545, -76.5308).

Susquehanna River at Marietta, PA

USGS Site No: 01576000 • Susquehanna River • Lancaster County, PA

Susquehanna River at Marietta, PA on the Susquehanna River is currently at 56,300 cfs (High — 88th percentile for this date) . Gage height: 38.72 ft.

Reading from 1 week ago

↑ Upstream on Susquehanna River

Susquehanna River at Harrisburg, PA

Downstream on Susquehanna River ↓

Susquehanna River at Conowingo, MD

56,300

CFS Discharge

38.72

Gage Height (ft)

High

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 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	11,500
25th	Low threshold	14,800
50th (Median)	Normal (median)	23,100
75th	High threshold	32,300
95th	Very High threshold	70,300	Today: 56,300 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	70,800	—
May 27, 2026	62,500	—
May 26, 2026	50,900	—
May 25, 2026	47,700	—
May 24, 2026	30,100	—
May 23, 2026	25,800	—
May 22, 2026	27,300	—
May 21, 2026	27,700	—
May 20, 2026	29,700	—
May 19, 2026	32,600	—
May 18, 2026	36,000	—
May 17, 2026	38,000	—
May 16, 2026	39,800	—
May 15, 2026	39,700	—
Apr 21, 2026	51,500	—
Apr 20, 2026	45,700	—
Apr 19, 2026	44,700	—
Apr 18, 2026	39,100	—
Apr 17, 2026	37,500	—
Apr 16, 2026	38,700	—
Apr 15, 2026	41,600	—
Apr 14, 2026	45,600	—
Apr 13, 2026	50,500	—
Apr 12, 2026	56,300	—
Apr 11, 2026	63,700	—
Apr 10, 2026	73,800	—
Apr 9, 2026	86,900	—
Apr 8, 2026	104,000	—
Apr 7, 2026	109,000	—
Apr 6, 2026	111,000	—

Station Information

USGS Site No: 01576000
State: PA
County: Lancaster County
Coordinates: 40.0545, -76.5308
Drainage Area: 25,990 mi²
Datum (ft): 200.6
HUC Code: 02050306

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 44.0 ft
Flood Stage: 49.0 ft
Moderate Flood: 52.0 ft
Major Flood: 54.0 ft

Currently 10.28 ft below flood stage.

Recent Extremes

Max discharge: 172,000 cfs

May 9, 2025
Min discharge: 3,840 cfs

Sep 23, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Susquehanna River at Harrisburg, PA
23.3 mi · 50,000 cfs

High
Beetree Run at Bentley Springs, MD
27.4 mi · 9 cfs

Normal
Gunpowder Falls at Hoffmanville, MD
28.5 mi · 17 cfs

Low
Deer Creek at Rocks, MD
30.1 mi · 81 cfs

Normal
Grave Run Near Beckleysville, MD
30.6 mi · 6 cfs

Normal