Rio Grande De Loiza at Highway 183 San Lorenzo water level

Name: Rio Grande De Loiza at Highway 183 San Lorenzo 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 Grande De Loiza, Puerto Rico, United States

Directions

Very low for late October

Water level

7.37ft Steady over the last 24 hours

Measured Oct 21, 2026, 04:15 AM AST (1 hour ago)

Flow: 37.3 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 Grande De Loiza at Highway 183 San Lorenzo is running far below normal at 7.37 ft.

The median for late October is 7.77 ft, based on 34 years of readings, so the river stage is 0.40 ft below typical. It is 6.63 ft below the flood stage of 14.00 ft. On the same day last year the reading was 7.44 ft, a difference of −0.07 ft.

It has barely moved over the past 24 hours. Without real rain upstream, that is unlikely to change quickly.

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

Compared with 34 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 7.77 ft0.40 ft below the median for this date
Normal for this date: 7.38 ft – 8.33 ft8 years in 10 fall in this range (34 years of records)
Same day last year: 7.44 ft−0.07 ft
Lowest and highest in 30 days: 7.21 ft – 8.39 ft
Lowest and highest in 12 months: 7.05 ft – 9.48 ft
Highest on record: 35.62 ftSeptember 10, 1996

Floating and fishing near Rio Grande De Loiza at Highway 183 San Lorenzo

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

Flood stage here is 14.00 ft, 6.63 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

18.00 ft: La Marina bridge PR 980 likely to be impassable. oms 3/2023
16.00 ft: Road 181 near Escuela Vocacional Dr. Antonio Fernos Isern flooded. OMS 4/2023
14.00 ft: Rio Loiza out of its banks along road 183./OMS 2/2022
7.37 ft: Right now

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

Highest crests on record

Rank	Level	Date
1	35.62 ft	September 10, 1996
2	31.37 ft	January 5, 1992
3	30.14 ft	September 21, 1998
4	27.71 ft	September 18, 2022
5	26.74 ft	September 15, 2004
6	24.50 ft	September 21, 2008
7	24.18 ft	September 20, 2017
8	23.67 ft	August 22, 2001
9	23.19 ft	August 23, 2000
10	21.81 ft	September 20, 1994

Weather at the gauge

Rain in the last 3 days: 0.26 in. Rain that falls upstream can take hours or days to show up at a river gauge.

21 Wed 87° 74° 0.07 in, 67% Wind 9 mph

22 Thu 88° 74° 0.11 in, 51% Wind 8 mph

23 Fri 87° 73° 0.12 in, 53% Wind 10 mph

24 Sat 85° 75° 0.14 in, 78% Wind 11 mph

25 Sun 86° 76° 0.09 in, 69% Wind 10 mph

26 Mon 86° 76° 0.19 in, 61% Wind 10 mph

27 Tue 85° 74° 0.09 in, 50% Wind 8 mph

Forecast: Open-Meteo

Sunrise 06:20 AM Sunset 05:58 PM Daylight 11 hr, 39 min Waxing gibbous 76%

Map

Other gauges on the Rio Grande De Loiza

Gauge	Level	Compared with normal	24 hours	Distance
Rio Grande De Loiza at Quebrada ArenasRiver gauge, Rio Grande De Loiza	5.07 ft	Normal	−0.03 ft	4.9 mi
Rio Grande De Loiza at CaguasRiver gauge, Rio Grande De Loiza	4.33 ft	Very low	−0.04 ft	5.0 mi
Rio Grande De Loiza below Loiza DamsiteRiver gauge, Rio Grande De Loiza	2.64 ft	Very low	−0.08 ft	11 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Rio Cayaguas at Cerro GordoRiver gauge, Rio Cayaguas	5.92 ft	Normal	−0.01 ft	2.2 mi
Rio Valenciano near JuncosRiver gauge, Rio Valenciano	2.84 ft	Low	−0.23 ft	3.1 mi
Rio Gurabo at GuraboRiver gauge, Rio Gurabo	4.32 ft	Normal	−1.05 ft	5.0 mi
Rio Turabo above BorinquenRiver gauge, Rio Turabo	3.62 ft	Very low	−0.03 ft	5.4 mi
Rio Gurabo below El MangoRiver gauge, Rio Gurabo	7.62 ft	Very low	−0.85 ft	6.0 mi
Rio Humacao at Las PiedrasRiver gauge, Rio Humacao	0.41 ft	Very low	−0.08 ft	6.1 mi
Rio Caguitas at Villa Blanca at CaguasRiver gauge, Rio Caguitas	7.90 ft	Normal	−0.02 ft	6.1 mi
Rio Bairoa above Bairoa, CaguasRiver gauge, Rio Bairoa	4.18 ft	Very low	−0.02 ft	7 mi

Questions and answers

Is the Rio Grande De Loiza at Highway 183 San Lorenzo higher than last year?

No, it is 0.07 ft lower than on the same day last year, when the reading was 7.44 ft.

What is flood stage for the Rio Grande De Loiza at Highway 183 San Lorenzo?

The official flood stage is 14.00 ft. The level is currently 6.63 ft below it.

What is a normal level for the Rio Grande De Loiza at Highway 183 San Lorenzo in late October?

The median for late October is 7.77 ft. In 8 years out of 10 the reading falls between 7.38 ft and 8.33 ft, based on 34 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 Grande De Loiza at Highway 183 San Lorenzo today?

On Oct 21, 2026, 04:15 AM AST, the water level was 7.37 ft. Steady over the last 24 hours.

Is Rio Grande De Loiza at Highway 183 San Lorenzo rising or falling?

Steady over the last 24 hours. Down 0.18 ft over the last 7 days.

Is the level of Rio Grande De Loiza at Highway 183 San Lorenzo normal?

Very low for late October. Compared with 34 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:50051800 (Agency page)
Coordinates: 18.18571, -65.96145 (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	7.37 ft	2026-10-21 08:15	Provisional
Flow	37.3 cfs	2026-10-21 08:15	Provisional

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How to cite

U.S. Geological Survey: Rio Grande De Loiza at Highway 183 San Lorenzo (usgs:50051800). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/puerto-rico/rio-grande-de-loiza-at-highway-183-san-lorenzo

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