Blackwater River Near Webster, NH

USGS Site No: 01087000 • Blackwater River • Merrimack County, NH

Blackwater River Near Webster, NH on the Blackwater River is currently at 248 cfs (High — 87th percentile for this date) . Gage height: 3.51 ft.

Reading from

248
CFS Discharge
3.51
Gage Height (ft)
High
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 25
25th Low threshold 42
50th (Median) Normal (median) 66
75th High threshold 118
95th Very High threshold 338 Today: 248 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.

2.3k 1.2k 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 347 —
May 27, 2026 463 —
May 26, 2026 410 —
May 25, 2026 242 —
May 24, 2026 198 —
May 23, 2026 221 —
May 22, 2026 245 —
May 21, 2026 299 —
May 20, 2026 405 —
May 19, 2026 533 —
May 18, 2026 823 —
May 17, 2026 1,490 —
May 16, 2026 1,430 —
May 15, 2026 678 —
Apr 21, 2026 275 —
Apr 20, 2026 272 —
Apr 19, 2026 268 —
Apr 18, 2026 257 —
Apr 17, 2026 247 —
Apr 16, 2026 268 —
Apr 15, 2026 240 —
Apr 14, 2026 191 —
Apr 13, 2026 226 —
Apr 12, 2026 283 —
Apr 11, 2026 290 —
Apr 10, 2026 290 —
Apr 9, 2026 405 —
Apr 8, 2026 544 —
Apr 7, 2026 544 —
Apr 6, 2026 533 —

Station Information

USGS Site No
01087000
State
NH
County
Merrimack County
Coordinates
43.2970, -71.6945
Drainage Area
129 mi²
Datum (ft)
431.2
HUC Code
01070003
View on USGS NWIS →

Recent Extremes

Max discharge
1,700 cfs
May 14, 2025
Min discharge
6 cfs
Sep 22, 2025

Computed from the local daily-values archive.

Nearby Gauges

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