Big Rock C near Valyermo CA

USGS Site No: 10263500 • Los Angeles County, CA

Big Rock C near Valyermo CA is currently at 61 cfs (Very High — 141th percentile for this date) . Gage height: 2.38 ft.

Reading from

61
CFS Discharge
2.38
Gage Height (ft)
Very 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 2
25th Low threshold 3
50th (Median) Normal (median) 4
75th High threshold 6
95th Very High threshold 11

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.

163 82 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 65 —
May 27, 2026 65 —
May 26, 2026 63 —
May 25, 2026 60 —
May 24, 2026 66 —
May 23, 2026 75 —
May 22, 2026 76 —
May 21, 2026 59 —
May 20, 2026 49 —
May 19, 2026 49 —
May 18, 2026 49 —
May 17, 2026 49 —
May 16, 2026 49 —
May 15, 2026 48 —
Apr 20, 2026 29 —
Apr 19, 2026 30 —
Apr 18, 2026 32 —
Apr 17, 2026 32 —
Apr 16, 2026 35 —
Apr 15, 2026 39 —
Apr 14, 2026 41 —
Apr 13, 2026 43 —
Apr 12, 2026 44 —
Apr 11, 2026 39 —
Apr 10, 2026 39 —
Apr 9, 2026 40 —
Apr 8, 2026 40 —
Apr 7, 2026 41 —
Apr 6, 2026 41 —
Apr 5, 2026 41 —

Station Information

USGS Site No
10263500
State
CA
County
Los Angeles County
Coordinates
34.4208, -117.8395
Drainage Area
23 mi²
Datum (ft)
4,035.7
HUC Code
18090206
View on USGS NWIS →

Recent Extremes

Max discharge
1,680 cfs
Dec 24, 2025
Min discharge
2 cfs
Oct 13, 2025

Computed from the local daily-values archive.

Nearby Gauges

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