San Gregorio C at San Gregorio CA

USGS Site No: 11162570 • San Mateo County, CA

San Gregorio C at San Gregorio CA is currently at 11 cfs (High — 77th percentile for this date) . Gage height: 3.88 ft.

Reading from

11
CFS Discharge
3.88
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 1
25th Low threshold 2
50th (Median) Normal (median) 5
75th High threshold 10
95th Very High threshold 19 Today: 11 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.

359 179 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 12 —
May 27, 2026 10 —
May 26, 2026 10 —
May 25, 2026 10 —
May 24, 2026 10 —
May 23, 2026 11 —
May 22, 2026 10 —
May 21, 2026 11 —
May 20, 2026 11 —
May 19, 2026 11 —
May 18, 2026 12 —
May 17, 2026 13 —
May 16, 2026 13 —
May 15, 2026 13 —
Apr 20, 2026 24 —
Apr 19, 2026 17 —
Apr 18, 2026 18 —
Apr 17, 2026 20 —
Apr 16, 2026 24 —
Apr 15, 2026 27 —
Apr 14, 2026 36 —
Apr 13, 2026 60 —
Apr 12, 2026 73 —
Apr 11, 2026 43 —
Apr 10, 2026 15 —
Apr 9, 2026 10 —
Apr 8, 2026 10 —
Apr 7, 2026 10 —
Apr 6, 2026 10 —
Apr 5, 2026 10 —

Station Information

USGS Site No
11162570
State
CA
County
San Mateo County
Coordinates
37.3257, -122.3866
Drainage Area
51 mi²
Datum (ft)
13.5
HUC Code
18050006
View on USGS NWIS →

Flood Stage Thresholds

Action Stage
15.0 ft
Flood Stage
17.7 ft
Moderate Flood
21.0 ft
Major Flood
25.0 ft

Currently 13.82 ft below flood stage.

Recent Extremes

Max discharge
872 cfs
Jan 4, 2026
Min discharge
2 cfs
Oct 10, 2025
Days at flood stage
0

Computed from the local daily-values archive.

Nearby Gauges

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