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San Juan Radar Outage Impacts Precipitation Estimates.. read more here

Hydrograph River at a Glance Download
Rio Piedras at Hato Rey Stage (ft)Flow (kcfs)USGS--Water Resources of the United StatesRPOP4(plotting HGIRG) Graph Created (9:51PM Dec 4, 2021)Flood Stage is 15 ft
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Tabular Data (UTC)
Tabular Data (AST)
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Datum: Not Available
NOTE: Forecasts are not available for the Rio Piedras at Hato Rey. Only observed stages are available for this point.
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Flood Categories (in feet)
Major Flood Stage: 19
Moderate Flood Stage: 17
Flood Stage: 15
Action Stage: 9
Low Stage (in feet): -9999

Historic Crests
(1) 22.91 ft on 09/20/2017
(2) 22.47 ft on 11/15/2009
(3) 22.11 ft on 09/10/1996
(4) 21.17 ft on 05/23/2004
(5) 20.77 ft on 06/17/1970
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(P): Preliminary values subject to further review.

Recent Crests
(1) 22.91 ft on 09/20/2017
(2) 19.72 ft on 05/20/2015
(3) 18.49 ft on 11/30/2013
(4) 20.27 ft on 05/21/2013
(5) 17.03 ft on 12/10/2011
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(P): Preliminary values subject to further review.

Low Water Records
(1) 12.13 ft on 08/08/1974

For more information on your flood risk go to

Zoom Level:14
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Gauge LocationGauge Map Marker
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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If you notice any errors in the below information, please contact our Webmaster
15.24 The following roads were flooded in Bo. Obrero:Avenida KennedyAvenida BarbosaAvenida Munoz RiveraRoosevelt AveSimon Maderade DiegoCalle NOtre Dame in University Gardens
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Latitude: 18.407553° N, Longitude: 66.068944° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 15 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 3.2 ft 18.2 ft  

Current/Historical Observations:

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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
San Juan Weather Forecast Office
4000 Carreterra 190
San Juan, PR 00979
(787) 253-4586
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Page last modified: 2-Nov-2020 7:30 PM
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