How high is the San Joaquin River near Vernalis CA right now?

The San Joaquin River near Vernalis CA is currently flowing at 1,940 cubic feet per second with a gage height of 9.43 feet, based on the most recent USGS instantaneous reading.

Is the flow on the San Joaquin River near Vernalis CA normal for this time of year?

Current flow is classified as normal for October 28. Today's discharge is at the 47th percentile compared to the long-term historical record at this gauge.

Is the San Joaquin River near Vernalis CA at flood stage?

No — the gage height is 19.57 feet below the NWS flood-stage threshold of 29.0 feet.

What is the historical median flow for the San Joaquin River near Vernalis CA on October 28?

The long-term median discharge for this date is 2,010 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 1,160 to 4,680 cfs.

Where is the San Joaquin River near Vernalis CA stream gauge located?

The San Joaquin River near Vernalis CA stream gauge is operated by the USGS in San Joaquin County, CA on the San Joaquin River. USGS site number 11303500 (coordinates 37.6760, -121.2663).

San Joaquin River near Vernalis CA

USGS Site No: 11303500 • San Joaquin River • San Joaquin County, CA

San Joaquin River near Vernalis CA on the San Joaquin River is currently at 1,940 cfs (Normal — 47th percentile for this date) . Gage height: 9.43 ft.

Reading from 4 months ago

↑ Upstream on San Joaquin River

San Joaquin River near Crows Landing CA

1,940

CFS Discharge

9.43

Gage Height (ft)

Normal

Flow Condition

Normal

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	1,160
25th	Low threshold	1,400
50th (Median)	Normal (median)	2,010	Today: 1,940 cfs
75th	High threshold	2,820
95th	Very High threshold	4,680

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.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	1,750	—
May 27, 2026	1,770	—
May 26, 2026	1,930	—
May 25, 2026	2,140	—
May 24, 2026	2,260	—
May 23, 2026	2,180	—
May 22, 2026	2,080	—
May 21, 2026	2,290	—
May 20, 2026	2,310	—
May 19, 2026	2,330	—
May 18, 2026	2,460	—
May 17, 2026	2,410	—
May 16, 2026	2,160	—
May 15, 2026	1,860	—
Apr 20, 2026	2,630	—
Apr 19, 2026	2,490	—
Apr 18, 2026	2,150	—
Apr 17, 2026	2,070	—
Apr 16, 2026	2,270	—
Apr 15, 2026	2,300	—
Apr 14, 2026	2,400	—
Apr 13, 2026	2,680	—
Apr 12, 2026	2,740	—
Apr 11, 2026	2,500	—
Apr 10, 2026	2,290	—
Apr 9, 2026	2,230	—
Apr 8, 2026	2,260	—
Apr 7, 2026	2,320	—
Apr 6, 2026	2,510	—
Apr 5, 2026	2,570	—

Station Information

USGS Site No: 11303500
State: CA
County: San Joaquin County
Coordinates: 37.6760, -121.2663
Drainage Area: 13,539 mi²
Datum (ft): 2.6
HUC Code: 18040003

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 24.5 ft
Flood Stage: 29.0 ft
Moderate Flood: 32.0 ft
Major Flood: 37.3 ft

Currently 19.57 ft below flood stage.

Recent Extremes

Max discharge: 8,440 cfs

Feb 21, 2026
Min discharge: 357 cfs

Jul 31, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Stanislaus River at Ripon CA
9.3 mi · 1,320 cfs

High
Tuolumne River at Modesto CA
15.8 mi · 202 cfs

Very Low
San Joaquin River near Crows Landing CA
21.8 mi · 510 cfs

Low
Stanislaus River at Oakdale CA
23.6 mi

Unknown
Arroyo Valle below Lang Cyn near Livermore CA
24.2 mi · 2 cfs

High