Sudbury River at Ashland, MA

USGS Site No: 01097480 • Sudbury River • Middlesex County, MA

Sudbury River at Ashland, MA on the Sudbury River is currently at 16 cfs (Normal — 32th percentile for this date) . Gage height: 0.76 ft.

Reading from

Downstream on Sudbury River ↓
Sudbury River at Saxonville, MA
16
CFS Discharge
0.76
Gage Height (ft)
Normal
Flow Condition
N/A
Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for October 28 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 0
25th Low threshold 9
50th (Median) Normal (median) 36 Today: 16 cfs
75th High threshold 69
95th Very High threshold 0

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.

138 69 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 20 —
May 27, 2026 25 —
May 26, 2026 30 —
May 25, 2026 28 —
May 24, 2026 17 —
May 23, 2026 14 —
May 22, 2026 17 —
May 21, 2026 22 —
May 20, 2026 33 —
May 19, 2026 23 —
May 18, 2026 22 —
May 17, 2026 30 —
May 16, 2026 35 —
May 15, 2026 36 —
Apr 21, 2026 44 —
Apr 20, 2026 48 —
Apr 19, 2026 52 —
Apr 18, 2026 57 —
Apr 17, 2026 63 —
Apr 16, 2026 63 —
Apr 15, 2026 49 —
Apr 14, 2026 42 —
Apr 13, 2026 43 —
Apr 12, 2026 44 —
Apr 11, 2026 49 —
Apr 10, 2026 53 —
Apr 9, 2026 57 —
Apr 8, 2026 62 —
Apr 7, 2026 68 —
Apr 6, 2026 73 —

Station Information

USGS Site No
01097480
State
MA
County
Middlesex County
Coordinates
42.2600, -71.4564
Drainage Area
35 mi²
Datum (ft)
185.0
HUC Code
010700050101
View on USGS NWIS →

Recent Extremes

Max discharge
303 cfs
Mar 12, 2026
Min discharge
2 cfs
Aug 28, 2025

Computed from the local daily-values archive.

Nearby Gauges

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