How high is the Llano Rv near Mason, TX right now?

The Llano Rv near Mason, TX is currently flowing at 406 cubic feet per second with a gage height of 7.32 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Llano Rv near Mason, TX normal for this time of year?

Current flow is classified as high for June 11. Today's discharge is at the 78th percentile compared to the long-term historical record at this gauge.

Is the Llano Rv near Mason, TX at flood stage?

No — the gage height is 10.68 feet below the NWS flood-stage threshold of 18.0 feet.

What is the historical median flow for the Llano Rv near Mason, TX on June 11?

The long-term median discharge for this date is 164 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 45 to 975 cfs.

Where is the Llano Rv near Mason, TX stream gauge located?

The Llano Rv near Mason, TX stream gauge is operated by the USGS in Mason County, TX on the Llano River. USGS site number 08150700 (coordinates 30.6607, -99.1092).

Llano Rv near Mason, TX

USGS Site No: 08150700 • Llano River • Mason County, TX

Llano Rv near Mason, TX on the Llano River is currently at 406 cfs (High — 78th percentile for this date) . Gage height: 7.32 ft.

Reading from 1 week ago

↑ Upstream on Llano River

Llano Rv near Junction, TX

Downstream on Llano River ↓

Llano Rv at Llano, TX

406

CFS Discharge

7.32

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	45
25th	Low threshold	84
50th (Median)	Normal (median)	164
75th	High threshold	293
95th	Very High threshold	975	Today: 406 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.

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

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	552	7.75
May 27, 2026	828	8.36
May 26, 2026	467	7.45
May 25, 2026	429	7.40
May 24, 2026	617	7.91
May 23, 2026	1,120	8.85
May 22, 2026	4,130	11.13
May 21, 2026	1,020	7.50
May 20, 2026	91	5.52
May 19, 2026	90	5.51
May 18, 2026	87	5.49
May 17, 2026	90	5.51
May 16, 2026	96	5.56
May 15, 2026	104	5.63
Apr 20, 2026	93	5.53
Apr 19, 2026	84	5.46
Apr 18, 2026	85	5.47
Apr 17, 2026	94	5.54
Apr 16, 2026	110	5.68
Apr 15, 2026	134	5.88
Apr 14, 2026	166	6.11
Apr 13, 2026	168	6.12
Apr 12, 2026	144	5.92
Apr 11, 2026	62	5.25
Apr 10, 2026	62	5.24
Apr 9, 2026	63	5.26
Apr 8, 2026	65	5.28
Apr 7, 2026	65	5.28
Apr 6, 2026	68	5.31
Apr 5, 2026	76	5.38

Station Information

USGS Site No: 08150700
State: TX
County: Mason County
Coordinates: 30.6607, -99.1092
Drainage Area: 3,247 mi²
Datum (ft): 1,225.6
HUC Code: 12090204

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 11.0 ft
Flood Stage: 18.0 ft
Moderate Flood: 24.0 ft
Major Flood: 28.0 ft

Currently 10.68 ft below flood stage.

Recent Extremes

Max discharge: 37,500 cfs

Jul 4, 2025
Min discharge: 33 cfs

May 21, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Beaver Ck near Mason, TX
1.4 mi · 5 cfs

Normal
Llano Rv at Llano, TX
26.8 mi · 848 cfs

High
Pedernales Rv near Fredericksburg, TX
33.6 mi · 28 cfs

Normal
Brady Ck at Brady, TX
35.6 mi · 1 cfs

High
Sandy Ck near Kingsland, TX
38.5 mi · 206 cfs

High