Mattole River near Ettersburg CA

USGS Site No: 11468900 • Mattole River • Humboldt County, CA

Mattole River near Ettersburg CA on the Mattole River is currently at 42 cfs (High — 93th percentile for this date) . Gage height: 8.79 ft.

Reading from

Downstream on Mattole River ↓
Mattole River near Petrolia CA
42
CFS Discharge
8.79
Gage Height (ft)
High
Flow Condition
N/A
Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for July 29 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 6
25th Low threshold 9
50th (Median) Normal (median) 12
75th High threshold 18
95th Very High threshold 44 Today: 42 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.

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 43 —
May 27, 2026 44 —
May 26, 2026 45 —
May 25, 2026 44 —
May 24, 2026 45 —
May 23, 2026 45 —
May 22, 2026 46 —
May 21, 2026 47 —
May 20, 2026 48 —
May 19, 2026 49 —
May 18, 2026 50 —
May 17, 2026 51 —
May 16, 2026 52 —
May 15, 2026 53 —
Apr 20, 2026 129 —
Apr 19, 2026 106 —
Apr 18, 2026 114 —
Apr 17, 2026 125 —
Apr 16, 2026 141 —
Apr 15, 2026 157 —
Apr 14, 2026 188 —
Apr 13, 2026 264 —
Apr 12, 2026 327 —
Apr 11, 2026 134 —
Apr 10, 2026 76 —
Apr 9, 2026 74 —
Apr 8, 2026 76 —
Apr 7, 2026 78 —
Apr 6, 2026 80 —
Apr 5, 2026 85 —

Station Information

USGS Site No
11468900
State
CA
County
Humboldt County
Coordinates
40.1393, -123.9914
Drainage Area
71 mi²
Datum (ft)
582.2
HUC Code
18010107
View on USGS NWIS →

Recent Extremes

Max discharge
11,300 cfs
Dec 21, 2025
Min discharge
3 cfs
Sep 27, 2025

Computed from the local daily-values archive.

Nearby Gauges

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