Norwalk River at South Wilton, CT

USGS Site No: 01209700 • Norwalk River • Western Connecticut Planning Region, CT

Norwalk River at South Wilton, CT on the Norwalk River is currently at 15 cfs (Normal — 29th percentile for this date) . Gage height: 1.27 ft.

Reading from

15
CFS Discharge
1.27
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 11
25th Low threshold 14
50th (Median) Normal (median) 21 Today: 15 cfs
75th High threshold 43
95th Very High threshold 124

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.

624 312 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 21 —
May 27, 2026 31 —
May 26, 2026 49 —
May 25, 2026 76 —
May 24, 2026 66 —
May 23, 2026 12 —
May 22, 2026 12 —
May 21, 2026 15 —
May 20, 2026 11 —
May 19, 2026 10 —
May 18, 2026 11 —
May 17, 2026 12 —
May 16, 2026 14 —
May 15, 2026 15 —
Apr 21, 2026 21 —
Apr 20, 2026 23 —
Apr 19, 2026 24 —
Apr 18, 2026 26 —
Apr 17, 2026 30 —
Apr 16, 2026 32 —
Apr 15, 2026 30 —
Apr 14, 2026 30 —
Apr 13, 2026 30 —
Apr 12, 2026 31 —
Apr 11, 2026 34 —
Apr 10, 2026 38 —
Apr 9, 2026 41 —
Apr 8, 2026 44 —
Apr 7, 2026 53 —
Apr 6, 2026 57 —

Station Information

USGS Site No
01209700
State
CT
County
Western Connecticut Planning Region
Coordinates
41.1638, -73.4195
Drainage Area
30 mi²
Datum (ft)
114.6
HUC Code
011000060202
View on USGS NWIS →

Recent Extremes

Max discharge
443 cfs
Mar 17, 2026
Min discharge
3 cfs
Sep 4, 2025

Computed from the local daily-values archive.

Nearby Gauges

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