How high is the San Marcos Rv at Luling, TX right now?

The San Marcos Rv at Luling, TX is currently flowing at 120 cubic feet per second with a gage height of 3.94 feet, based on the most recent USGS instantaneous reading.

Is the flow on the San Marcos Rv at Luling, TX normal for this time of year?

Current flow is classified as low for June 11. Today's discharge is at the 19th percentile compared to the long-term historical record at this gauge.

Is the San Marcos Rv at Luling, TX at flood stage?

No — the gage height is 16.06 feet below the NWS flood-stage threshold of 20.0 feet.

What is the historical median flow for the San Marcos Rv at Luling, TX on June 11?

The long-term median discharge for this date is 254 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 97 to 5,540 cfs.

Where is the San Marcos Rv at Luling, TX stream gauge located?

The San Marcos Rv at Luling, TX stream gauge is operated by the USGS in Caldwell County, TX on the San Marcos River. USGS site number 08172000 (coordinates 29.6663, -97.6509).

San Marcos Rv at Luling, TX

USGS Site No: 08172000 • San Marcos River • Caldwell County, TX

San Marcos Rv at Luling, TX on the San Marcos River is currently at 120 cfs (Low — 19th percentile for this date) . Gage height: 3.94 ft.

Reading from 1 week ago

↑ Upstream on San Marcos River

San Marcos Rv near Martindale, TX

120

CFS Discharge

3.94

Gage Height (ft)

Low

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	97
25th	Low threshold	135	Today: 120 cfs
50th (Median)	Normal (median)	254
75th	High threshold	641
95th	Very High threshold	5,540

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	164	4.21
May 27, 2026	110	3.87
May 26, 2026	94	3.74
May 25, 2026	96	3.76
May 24, 2026	100	3.80
May 23, 2026	103	3.82
May 22, 2026	108	3.86
May 21, 2026	110	3.87
May 20, 2026	100	3.79
May 19, 2026	91	3.72
May 18, 2026	92	3.73
May 17, 2026	92	3.73
May 16, 2026	93	3.73
May 15, 2026	94	3.75
Apr 20, 2026	133	4.02
Apr 19, 2026	90	3.71
Apr 18, 2026	81	3.63
Apr 17, 2026	80	3.62
Apr 16, 2026	82	3.64
Apr 15, 2026	83	3.65
Apr 14, 2026	88	3.70
Apr 13, 2026	92	3.72
Apr 12, 2026	113	3.89
Apr 11, 2026	90	3.71
Apr 10, 2026	83	3.65
Apr 9, 2026	80	3.62
Apr 8, 2026	82	3.64
Apr 7, 2026	85	3.66
Apr 6, 2026	112	3.88
Apr 5, 2026	91	3.73

Station Information

USGS Site No: 08172000
State: TX
County: Caldwell County
Coordinates: 29.6663, -97.6509
Drainage Area: 838 mi²
Datum (ft): 322.2
HUC Code: 12100203

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 11.0 ft
Flood Stage: 20.0 ft
Moderate Flood: 24.0 ft
Major Flood: 30.0 ft

Currently 16.06 ft below flood stage.

Recent Extremes

Max discharge: 1,200 cfs

Jun 16, 2025
Min discharge: 71 cfs

May 22, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Guadalupe Rv at Creek 143 near Gonzales, TX
12.9 mi · 420 cfs

Normal
Guadalupe Rv at Fm 1117 near Seguin, TX
16.5 mi · 70 cfs

Very Low
San Marcos Spgs at San Marcos, TX
22.9 mi

Unknown
San Marcos Rv at San Marcos, TX
22.9 mi · 89 cfs

Low
Guadalupe Rv at New Braunfels, TX
27.5 mi · 0 cfs

Unknown