Rio Humacao at Las Piedras water level

Name: Rio Humacao at Las Piedras water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Rio Humacao, Puerto Rico, United States

Directions

Very low for late October

Water level

0.41ft Down 0.08 ft over the last 24 hours

Measured Oct 21, 2026, 05:00 AM AST (1 hour ago)

Flow: 10.1 cfs

History

7 days 30 days 1 year Years compared

20252026

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

What this means

The Rio Humacao at Las Piedras is running far below normal at 0.41 ft.

That puts it 0.40 ft below the median of 0.81 ft for late October, based on 38 years of readings. It is 9.59 ft below the flood stage of 10.00 ft. A year ago it stood at 0.59 ft (−0.18 ft).

It has dropped 0.08 ft over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. In the last month it has stayed between 0.34 ft and 1.12 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that.

Compared with 38 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 0.81 ft0.40 ft below the median for this date
Normal for this date: 0.60 ft – 1.06 ft8 years in 10 fall in this range (38 years of records)
Same day last year: 0.59 ft−0.18 ft
Lowest and highest in 30 days: 0.34 ft – 1.12 ft
Lowest and highest in 12 months: 0.26 ft – 1.81 ft
Highest on record: 34.40 ftSeptember 6, 1960

Floating and fishing near Rio Humacao at Las Piedras

Low water exposes gravel bars that make good wading access, but some boat ramps may be left high and dry.

Flood stage here is 10.00 ft, 9.59 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

Highest crests on record

Rank	Level	Date
1	34.40 ft	September 6, 1960
2	21.80 ft	December 8, 1987
3	21.34 ft	October 9, 1970
4	20.79 ft	May 21, 1969
5	18.78 ft	August 27, 1970
6	13.02 ft	December 10, 1975
7	12.04 ft	September 16, 1975
8	12.03 ft	September 19, 2022
9	10.50 ft	October 22, 1998
10	10.42 ft	September 10, 1996

Weather at the gauge

Rain in the last 3 days: 0.35 in. Rain that falls upstream can take hours or days to show up at a river gauge.

20 Tue 88° 72° 0.05 in, 47% Wind 7 mph

21 Wed 85° 74° 0.09 in, 82% Wind 8 mph

22 Thu 85° 73° 0.18 in, 53% Wind 8 mph

23 Fri 85° 72° 0.16 in, 74% Wind 9 mph

24 Sat 83° 74° 0.24 in, 95% Wind 11 mph

25 Sun 85° 75° 0.13 in, 82% Wind 10 mph

26 Mon 85° 75° 0.14 in, 76% Wind 10 mph

Forecast: Open-Meteo

Sunrise 06:19 AM Sunset 05:58 PM Daylight 11 hr, 39 min Waxing gibbous 76%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Rio Gurabo below El MangoRiver gauge, Rio Gurabo	7.61 ft	Very low	−0.77 ft	4.3 mi
Rio Valenciano near JuncosRiver gauge, Rio Valenciano	2.83 ft	Low	−0.20 ft	4.7 mi
Rio Cayaguas at Cerro GordoRiver gauge, Rio Cayaguas	5.92 ft	Normal	−0.01 ft	5.9 mi
Rio Grande De Loiza at Highway 183 San LorenzoRiver gauge, Rio Grande De Loiza	7.36 ft	Very low	−0.02 ft	6.1 mi
Rio Blanco at FloridaRiver gauge, Rio Blanco	3.69 ft	Below flood stage	−0.11 ft	7 mi
Rio Guayanes at Central RoigRiver gauge, Rio Guayanes	12.50 ft	Normal	−0.11 ft	7 mi
Rio Guayanes near YabucoaRiver gauge, Rio Guayanes	10.15 ft	Normal	−0.14 ft	8 mi
Rio Grande De Loiza at Quebrada ArenasRiver gauge, Rio Grande De Loiza	5.07 ft	Normal	−0.03 ft	9 mi

Questions and answers

How does the Rio Humacao at Las Piedras compare with last year?

It is 0.18 ft lower than on the same day last year, when the reading was 0.59 ft.

What is flood stage for the Rio Humacao at Las Piedras?

The official flood stage is 10.00 ft. The level is currently 9.59 ft below it.

What is a normal level for the Rio Humacao at Las Piedras in late October?

The median for late October is 0.81 ft. In 8 years out of 10 the reading falls between 0.60 ft and 1.06 ft, based on 38 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 Rio Humacao at Las Piedras today?

On Oct 21, 2026, 05:00 AM AST, the water level was 0.41 ft. Down 0.08 ft over the last 24 hours.

Is Rio Humacao at Las Piedras rising or falling?

Down 0.08 ft over the last 24 hours. Down 0.13 ft over the last 7 days.

Is the level of Rio Humacao at Las Piedras normal?

Very low for late October. Compared with 38 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:50081000 (Agency page)
Coordinates: 18.17406, -65.86944 (WGS84)
Vertical datum: PRVD02
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	0.41 ft	2026-10-21 09:00	Provisional
Flow	10.1 cfs	2026-10-21 09:00	Provisional

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How to cite

U.S. Geological Survey: Rio Humacao at Las Piedras (usgs:50081000). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/puerto-rico/rio-humacao-at-las-piedras

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.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer