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

The San Marcos Rv at San Marcos, TX is currently flowing at 89 cubic feet per second with a gage height of 3.88 feet, based on the most recent USGS instantaneous reading.

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

Current flow is classified as low for June 11. Today's discharge is at the 10th percentile compared to the long-term historical record at this gauge.

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

The long-term median discharge for this date is 182 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 89 to 348 cfs.

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

The San Marcos Rv at San Marcos, TX stream gauge is operated by the USGS in Hays County, TX on the San Marcos River. USGS site number 08170500 (coordinates 29.8891, -97.9342).

San Marcos Rv at San Marcos, TX

USGS Site No: 08170500 • San Marcos River • Hays County, TX

San Marcos Rv at San Marcos, TX on the San Marcos River is currently at 89 cfs (Low — 10th percentile for this date) . Gage height: 3.88 ft.

Reading from 1 week ago

Downstream on San Marcos River ↓

San Marcos Rv near Martindale, TX

CFS Discharge

3.88

Gage Height (ft)

Low

Flow Condition

N/A

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	89
25th	Low threshold	120	Today: 89 cfs
50th (Median)	Normal (median)	182
75th	High threshold	241
95th	Very High threshold	348

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	87	3.83
May 27, 2026	88	3.85
May 26, 2026	88	3.86
May 25, 2026	86	3.86
May 24, 2026	85	3.87
May 23, 2026	85	3.86
May 22, 2026	85	3.87
May 21, 2026	85	3.86
May 20, 2026	87	3.91
May 19, 2026	85	3.85
May 18, 2026	85	3.86
May 17, 2026	85	—
May 16, 2026	86	—
May 15, 2026	85	—
Apr 20, 2026	84	3.89
Apr 19, 2026	78	3.73
Apr 18, 2026	76	3.69
Apr 17, 2026	75	3.66
Apr 16, 2026	74	3.65
Apr 15, 2026	75	3.67
Apr 14, 2026	76	3.69
Apr 13, 2026	77	3.70
Apr 12, 2026	76	3.70
Apr 11, 2026	76	3.69
Apr 10, 2026	77	3.73
Apr 9, 2026	74	3.64
Apr 8, 2026	74	3.66
Apr 7, 2026	75	3.66
Apr 6, 2026	75	3.66
Apr 5, 2026	73	3.63

Station Information

USGS Site No: 08170500
State: TX
County: Hays County
Coordinates: 29.8891, -97.9342
Drainage Area: 49 mi²
Datum (ft): 557.7
HUC Code: 12100203

View on USGS NWIS →

Recent Extremes

Max discharge: 108 cfs

Jul 15, 2025
Min discharge: 72 cfs

Mar 28, 2026

Computed from the local daily-values archive.

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