How high is the Rio Grande near Castolon, TX right now?

The Rio Grande near Castolon, TX is currently flowing at 8 cubic feet per second with a gage height of 2.19 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Rio Grande near Castolon, TX normal for this time of year?

Current flow is classified as low for June 11. Today's discharge is at the 20th percentile compared to the long-term historical record at this gauge.

Is the Rio Grande near Castolon, TX at flood stage?

No — the gage height is 12.81 feet below the NWS flood-stage threshold of 15.0 feet.

What is the historical median flow for the Rio Grande near Castolon, TX on June 11?

The long-term median discharge for this date is 114 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 5 to unavailable cfs.

Where is the Rio Grande near Castolon, TX stream gauge located?

The Rio Grande near Castolon, TX stream gauge is operated by the USGS in Brewster County, TX on the Rio Grande. USGS site number 08374550 (coordinates 29.1380, -103.5249).

Rio Grande near Castolon, TX

USGS Site No: 08374550 • Rio Grande • Brewster County, TX

Rio Grande near Castolon, TX on the Rio Grande is currently at 8 cfs (Low — 20th percentile for this date) . Gage height: 2.19 ft.

Reading from 1 week ago

CFS Discharge

2.19

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	5
25th	Low threshold	10	Today: 8 cfs
50th (Median)	Normal (median)	114
75th	High threshold	250
95th	Very High threshold	0

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	11	2.29
May 27, 2026	40	2.56
May 26, 2026	74	2.74
May 25, 2026	103	2.81
May 24, 2026	372	3.71
May 23, 2026	167	2.86
May 22, 2026	17	2.28
May 21, 2026	125	2.90
May 20, 2026	73	2.35
May 19, 2026	6	1.99
May 18, 2026	6	2.03
May 17, 2026	6	2.05
May 16, 2026	6	2.06
May 15, 2026	7	2.08
Apr 20, 2026	130	2.95
Apr 19, 2026	142	2.99
Apr 18, 2026	139	2.98
Apr 17, 2026	129	2.94
Apr 16, 2026	144	3.00
Apr 15, 2026	195	3.18
Apr 14, 2026	225	3.29
Apr 13, 2026	178	3.12
Apr 12, 2026	662	4.43
Apr 11, 2026	252	3.35
Apr 10, 2026	111	2.88
Apr 9, 2026	114	2.89
Apr 8, 2026	126	2.93
Apr 7, 2026	112	2.88
Apr 6, 2026	73	2.74
Apr 5, 2026	57	2.66

Station Information

USGS Site No: 08374550
State: TX
County: Brewster County
Coordinates: 29.1380, -103.5249
Datum (ft): 2,109.6
HUC Code: 13040205

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 13.0 ft
Flood Stage: 15.0 ft
Moderate Flood: 19.0 ft
Major Flood: 24.0 ft

Currently 12.81 ft below flood stage.

Recent Extremes

Max discharge: 15,800 cfs

Jul 4, 2025
Min discharge: 0 cfs

Jun 21, 2025
Days at flood stage: 2

Computed from the local daily-values archive.

Nearby Gauges

Rio Grande at Rio Grande Village, Big Bnd Np, TX
33.3 mi · 63 cfs

Normal