Pilarcitos C at Half Moon Bay CA

USGS Site No: 11162630 • San Mateo County, CA

Pilarcitos C at Half Moon Bay CA is currently at 6 cfs (High — 77th percentile for this date) . Gage height: 2.50 ft.

Reading from

6
CFS Discharge
2.50
Gage Height (ft)
High
Flow Condition
Normal
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 0
25th Low threshold 1
50th (Median) Normal (median) 3
75th High threshold 6
95th Very High threshold 11 Today: 6 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.

164 82 0 cfs Apr 3 May 28
10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date Discharge (CFS) Gage Ht (ft)
May 28, 2026 9 —
May 27, 2026 7 —
May 26, 2026 7 —
May 25, 2026 7 —
May 24, 2026 7 —
May 22, 2026 7 —
May 20, 2026 7 —
May 19, 2026 8 —
May 18, 2026 8 —
May 17, 2026 9 —
May 16, 2026 9 —
May 15, 2026 9 —
Apr 20, 2026 27 —
Apr 19, 2026 18 —
Apr 18, 2026 19 —
Apr 17, 2026 18 —
Apr 16, 2026 19 —
Apr 15, 2026 22 —
Apr 14, 2026 27 —
Apr 13, 2026 38 —
Apr 12, 2026 48 —
Apr 11, 2026 44 —
Apr 10, 2026 16 —
Apr 9, 2026 9 —
Apr 8, 2026 8 —
Apr 7, 2026 8 —
Apr 6, 2026 8 —
Apr 5, 2026 9 —
Apr 4, 2026 9 —
Apr 3, 2026 10 —

Station Information

USGS Site No
11162630
State
CA
County
San Mateo County
Coordinates
37.4666, -122.4341
Drainage Area
27 mi²
Datum (ft)
34.1
HUC Code
18050006
View on USGS NWIS →

Flood Stage Thresholds

Action Stage
7.5 ft
Flood Stage
9.1 ft
Moderate Flood
17.0 ft
Major Flood
24.0 ft

Currently 6.60 ft below flood stage.

Recent Extremes

Max discharge
301 cfs
Jan 5, 2026
Min discharge
2 cfs
Nov 9, 2025
Days at flood stage
0

Computed from the local daily-values archive.

Nearby Gauges

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