Mattole River near Petrolia CA

USGS Site No: 11469000 • Mattole River • Humboldt County, CA

Mattole River near Petrolia CA on the Mattole River is currently at 105 cfs (Normal — 54th percentile for this date) . Gage height: 11.75 ft.

Reading from

↑ Upstream on Mattole River
Mattole River near Ettersburg CA
105
CFS Discharge
11.75
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 25
25th Low threshold 36
50th (Median) Normal (median) 66
75th High threshold 290 Today: 105 cfs
95th Very High threshold 972

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.

5.6k 2.8k 0 cfs Apr 5 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 111 —
May 27, 2026 115 —
May 26, 2026 113 —
May 25, 2026 112 —
May 24, 2026 114 —
May 23, 2026 117 —
May 22, 2026 121 —
May 21, 2026 125 —
May 20, 2026 128 —
May 19, 2026 133 —
May 18, 2026 137 —
May 17, 2026 140 —
May 16, 2026 146 —
May 15, 2026 152 —
Apr 20, 2026 417 —
Apr 19, 2026 373 —
Apr 18, 2026 406 —
Apr 17, 2026 453 —
Apr 16, 2026 520 —
Apr 15, 2026 570 —
Apr 14, 2026 688 —
Apr 13, 2026 974 —
Apr 12, 2026 849 —
Apr 11, 2026 376 —
Apr 10, 2026 257 —
Apr 9, 2026 257 —
Apr 8, 2026 267 —
Apr 7, 2026 282 —
Apr 6, 2026 300 —
Apr 5, 2026 328 —

Station Information

USGS Site No
11469000
State
CA
County
Humboldt County
Coordinates
40.3132, -124.2834
Drainage Area
245 mi²
Datum (ft)
49.8
HUC Code
18010107
View on USGS NWIS →

Recent Extremes

Max discharge
20,500 cfs
Dec 21, 2025
Min discharge
21 cfs
Sep 28, 2025

Computed from the local daily-values archive.

Nearby Gauges

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