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Medina River at San Antonio water level

River gauge, Medina River, Texas, United States

Directions

Right now

Low for mid-October

Water level

3.03ft Steady over the last 24 hours

Flow
58.6 cfs
Water temperature
79 °F
0 25 50 Highest onrecord 55.65 ft Minor floodstage 20.00 ft

History

History
468ftOct 13Oct 14Oct 16Oct 17Oct 19468ftOct 13Oct 16Oct 19
468ftSep 20Sep 27Oct 4Oct 11Oct 19468ftSep 20Oct 4Oct 19
1020ftOct 2025Jan 2026Apr 2026Jul 2026Oct 2026Minor flood stage1020ftOct 2025Apr 2026Oct 2026Minor flood stage
51015ftJanMarMayJulSepNov202651015ftJanAprJulOct2026

20252026

Water level Normal range (10–90 %) Minor flood stage

What this means

Low water at Medina River at San Antonio: the gauge reads 3.03 ft, below normal for mid-October.

That puts it 0.83 ft below the median of 3.86 ft for mid-October, based on 37 years of readings. It is 16.97 ft below the flood stage of 20.00 ft. A year ago it stood at 2.75 ft (+0.28 ft).

The level has held steady over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. The 30-day range is 2.78 ft – 5.53 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that. The sensor also reports a water temperature of 79 °F.

Compared with 37 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
3.86 ft0.83 ft below the median for this date
Normal for this date
3.01 ft – 6.95 ft8 years in 10 fall in this range (37 years of records)
Same day last year
2.75 ft+0.28 ft
Lowest and highest in 30 days
2.78 ft – 5.53 ft
Lowest and highest in 12 months
2.76 ft – 15.11 ft
Highest on record
55.65 ftJuly 4, 2002

Paddling and fishing conditions

At low levels, plan for shorter paddling trips and expect to walk your boat through a few shoals.

For reference, flood stage is 20.00 ft.

What happens at each level

28.00 ft
Major flooding puts the Farm to Market 1937 bridge floor under eight feet of water. Flow approaches homes downstream near Losoya. Livestock are cut off and potentiallly drowned in the flood plain.
24.00 ft
Moderate lowland flooding floods secondary roads and bridges making them dangerous to traffic.
20.00 ft
Minor lowland flooding reaches the Farm to Market 1937 bridge floor.
16.00 ft
Overbank conditions with water extending into lowest areas of the flood plain with no significant damage.
3.03 ft
Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Chance of at least minor flooding in October to December: 25 %.

RankLevelDate
155.65 ftJuly 4, 2002
255.00 ftJuly 1, 1900
349.47 ftOctober 18, 1998
443.59 ftJuly 17, 1973
541.57 ftAugust 29, 1946
637.37 ftJune 5, 1987
732.37 ftMay 26, 2013
832.20 ftJuly 1, 1936
930.16 ftDecember 22, 1992
1029.04 ftJune 14, 1981

Weather at the gauge

The forecast is not available right now.

Sunrise 07:38 AM Sunset 07:01 PM Daylight 11 hr, 22 min First quarter 55%

Map

Other gauges on the Medina River

Gauge Level Compared with normal 24 hours Distance
Medina River at Patterson Rd at MedinaRiver gauge, Medina River 4.20 ft Normal −0.01 ft 58 mi
Medina River at BanderaRiver gauge, Medina River 3.58 ft Normal +0.02 ft 47 mi
Medina River above English Crsg near Pipe CreekRiver gauge, Medina River 19.3 cfs Normal −0.8 cfs 42 mi
Medina River at La CosteRiver gauge, Medina River 9.04 ft Below flood stage ±0 20 mi
Medina River near MacdonaRiver gauge, Medina River −0.07 ft Low +0.04 ft 13 mi
Medina River near SomersetRiver gauge, Medina River 4.04 ft Low +0.01 ft 5.5 mi

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
San Antonio River at Loop 410, San AntonioRiver gauge, San Antonio River 3.67 ft Low −0.03 ft 4.7 mi
Leon Creek at IH 35, San AntonioRiver gauge, Leon Creek 2.22 ft Normal +0.02 ft 7 mi
Salado Creek at Loop 13, San AntonioRiver gauge, Salado Creek 5.18 ft Low −0.02 ft 8 mi
San Antonio River near ElmendorfRiver gauge, San Antonio River 9.35 ft Low +0.06 ft 9 mi
San Antonio River at Mitchell St, San AntonioRiver gauge, San Antonio River 4.25 ft Normal −0.01 ft 9 mi
San Pedro Creek at Furnish St, San AntonioRiver gauge, San Pedro Creek 0.0 cfs Very low ±0 10 mi
San Antonio River at San AntonioRiver gauge, San Antonio River 3.94 ft Normal ±0 10 mi
Leon Creek at Lp 410 at San AntonioRiver gauge, Leon Creek 4.04 ft Low −0.02 ft 15 mi

Questions and answers

How does the Medina River at San Antonio compare with last year?

It is 0.28 ft higher than on the same day last year, when the reading was 2.75 ft.

What is flood stage for the Medina River at San Antonio?

The official flood stage is 20.00 ft. The level is currently 16.97 ft below it.

What is a normal level for the Medina River at San Antonio in mid-October?

The median for mid-October is 3.86 ft. In 8 years out of 10 the reading falls between 3.01 ft and 6.95 ft, based on 37 years of records.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Medina River at San Antonio today?

On Oct 18, 2026, 10:15 PM CDT, the water level was 3.03 ft. Steady over the last 24 hours.

Is Medina River at San Antonio rising or falling?

Steady over the last 24 hours. Up 0.09 ft over the last 7 days.

Is the level of Medina River at San Antonio normal?

Low for mid-October. Compared with 37 years of daily readings for this time of year.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:08181500 (Agency page)
Coordinates
29.26413, -98.49085 (WGS84)
Vertical datum
NAVD88
Update interval
every 15 minutes
Licence
Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Water level 3.03 ft 2026-10-19 03:15 Provisional
Flow 58.6 cfs 2026-10-19 03:15 Provisional
Water temperature 79 °F 2026-10-19 03:15 Provisional

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How to cite

U.S. Geological Survey: Medina River at San Antonio (usgs:08181500). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/texas/medina-river-at-san-antonio

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.