Swan River at East Patchogue NY

USGS Site No: 01305500 • Swan River • Suffolk County, NY

Swan River at East Patchogue NY on the Swan River is currently at 10 cfs (Normal — 28th percentile for this date) . Gage height: 0.48 ft.

Reading from

10
CFS Discharge
0.48
Gage Height (ft)
Normal
Flow Condition
N/A
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 10
25th Low threshold 10
50th (Median) Normal (median) 13 Today: 10 cfs
75th High threshold 15
95th Very High threshold 18

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.

24 12 0 cfs Apr 6 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 11 —
May 27, 2026 12 —
May 26, 2026 12 —
May 25, 2026 13 —
May 24, 2026 13 —
May 23, 2026 11 —
May 22, 2026 11 —
May 21, 2026 12 —
May 20, 2026 12 —
May 19, 2026 11 —
May 18, 2026 12 —
May 17, 2026 12 —
May 16, 2026 12 —
May 15, 2026 12 —
Apr 21, 2026 13 —
Apr 20, 2026 14 —
Apr 19, 2026 14 —
Apr 18, 2026 14 —
Apr 17, 2026 14 —
Apr 16, 2026 14 —
Apr 15, 2026 14 —
Apr 14, 2026 14 —
Apr 13, 2026 14 —
Apr 12, 2026 14 —
Apr 11, 2026 14 —
Apr 10, 2026 14 —
Apr 9, 2026 14 —
Apr 8, 2026 14 —
Apr 7, 2026 14 —
Apr 6, 2026 14 —

Station Information

USGS Site No
01305500
State
NY
County
Suffolk County
Coordinates
40.7673, -72.9938
Drainage Area
8 mi²
Datum (ft)
2.8
HUC Code
02030202
View on USGS NWIS →

Recent Extremes

Max discharge
16 cfs
Mar 6, 2026
Min discharge
8 cfs
Oct 10, 2025

Computed from the local daily-values archive.

Nearby Gauges

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