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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of Spring 2024. Existing AHPS content and features will be preserved and expanded within NWPS. The NWS is now accepting feedback on NWPS. Please visit https://www.weather.gov/owp/operations for more information.

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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)Observed: 3.96 ft at 7:30PM Dec 04, 2023Observed: 3.96 ft at 7:45PM Dec 04, 2023Observed: 3.95 ft at 8:00PM Dec 04, 2023Observed: 3.96 ft at 8:15PM Dec 04, 2023Observed: 3.96 ft at 8:30PM Dec 04, 2023Observed: 3.96 ft at 8:45PM Dec 04, 2023Observed: 3.96 ft at 9:00PM Dec 04, 2023Observed: 3.96 ft at 9:15PM Dec 04, 2023Observed: 3.95 ft at 9:30PM Dec 04, 2023Observed: 3.96 ft at 9:45PM Dec 04, 2023Observed: 3.96 ft at 10:00PM Dec 04, 2023Observed: 3.96 ft at 10:15PM Dec 04, 2023Observed: 3.96 ft at 10:30PM Dec 04, 2023Observed: 3.97 ft at 10:45PM Dec 04, 2023Observed: 3.97 ft at 11:00PM Dec 04, 2023Observed: 3.97 ft at 11:15PM Dec 04, 2023Observed: 3.97 ft at 11:30PM Dec 04, 2023Observed: 3.97 ft at 11:45PM Dec 04, 2023Observed: 3.97 ft at 12:00AM Dec 05, 2023Highest Observation: 3.98 ft at 12:15AM Dec 05, 2023Observed: 3.97 ft at 12:30AM Dec 05, 2023Observed: 3.97 ft at 12:45AM Dec 05, 2023Observed: 3.97 ft at 1:00AM Dec 05, 2023Observed: 3.97 ft at 1:15AM Dec 05, 2023Observed: 3.97 ft at 1:30AM Dec 05, 2023Observed: 3.97 ft at 1:45AM Dec 05, 2023Observed: 3.97 ft at 2:00AM Dec 05, 2023Observed: 3.97 ft at 2:15AM Dec 05, 2023Observed: 3.97 ft at 2:30AM Dec 05, 2023Observed: 3.96 ft at 2:45AM Dec 05, 2023Observed: 3.97 ft at 3:00AM Dec 05, 2023Observed: 3.97 ft at 3:15AM Dec 05, 2023Observed: 3.97 ft at 3:30AM Dec 05, 2023Observed: 3.97 ft at 3:45AM Dec 05, 2023Observed: 3.97 ft at 4:00AM Dec 05, 2023Observed: 3.97 ft at 4:15AM Dec 05, 2023Observed: 3.97 ft at 4:30AM Dec 05, 2023Observed: 3.97 ft at 4:45AM Dec 05, 2023Observed: 3.97 ft at 5:00AM Dec 05, 2023Observed: 3.97 ft at 5:15AM Dec 05, 2023Observed: 3.96 ft at 5:30AM Dec 05, 2023Observed: 3.96 ft at 5:45AM Dec 05, 2023Observed: 3.97 ft at 6:00AM Dec 05, 2023Observed: 3.97 ft at 6:15AM Dec 05, 2023Observed: 3.97 ft at 6:30AM Dec 05, 2023Observed: 3.96 ft at 6:45AM Dec 05, 2023Observed: 3.96 ft at 7:00AM Dec 05, 2023Observed: 3.97 ft at 7:15AM Dec 05, 2023Observed: 3.97 ft at 7:30AM Dec 05, 2023Observed: 3.97 ft at 7:45AM Dec 05, 2023Observed: 3.97 ft at 8:00AM Dec 05, 2023Observed: 3.97 ft at 8:15AM Dec 05, 2023Observed: 3.97 ft at 8:30AM Dec 05, 2023Observed: 3.97 ft at 8:45AM Dec 05, 2023Observed: 3.96 ft at 9:00AM Dec 05, 2023Observed: 3.96 ft at 9:15AM Dec 05, 2023Observed: 3.96 ft at 9:30AM Dec 05, 2023Observed: 3.97 ft at 9:45AM Dec 05, 2023Observed: 3.97 ft at 10:00AM Dec 05, 2023Observed: 3.96 ft at 10:15AM Dec 05, 2023Observed: 3.96 ft at 10:30AM Dec 05, 2023Observed: 3.96 ft at 10:45AM Dec 05, 2023Observed: 3.95 ft at 11:00AM Dec 05, 2023Observed: 3.96 ft at 11:15AM Dec 05, 2023Observed: 3.96 ft at 11:30AM Dec 05, 2023Observed: 3.96 ft at 11:45AM Dec 05, 2023Observed: 3.96 ft at 12:00PM Dec 05, 2023Observed: 3.96 ft at 12:15PM Dec 05, 2023Observed: 3.96 ft at 12:30PM Dec 05, 2023Observed: 3.96 ft at 12:45PM Dec 05, 2023Observed: 3.96 ft at 1:00PM Dec 05, 2023Observed: 3.96 ft at 1:15PM Dec 05, 2023Observed: 3.96 ft at 1:30PM Dec 05, 2023Observed: 3.96 ft at 1:45PM Dec 05, 2023Observed: 3.95 ft at 2:00PM Dec 05, 2023Observed: 3.95 ft at 2:15PM Dec 05, 2023Observed: 3.95 ft at 2:30PM Dec 05, 2023Observed: 3.95 ft at 2:45PM Dec 05, 2023Observed: 3.95 ft at 3:00PM Dec 05, 2023Observed: 3.94 ft at 3:15PM Dec 05, 2023Observed: 3.95 ft at 3:30PM Dec 05, 2023Observed: 3.96 ft at 3:45PM Dec 05, 2023Observed: 3.96 ft at 4:00PM Dec 05, 2023Observed: 3.95 ft at 4:15PM Dec 05, 2023Observed: 3.95 ft at 4:30PM Dec 05, 2023Observed: 3.95 ft at 4:45PM Dec 05, 2023Observed: 3.96 ft at 5:00PM Dec 05, 2023Observed: 3.96 ft at 5:15PM Dec 05, 2023Observed: 3.95 ft at 5:30PM Dec 05, 2023Observed: 3.96 ft at 5:45PM Dec 05, 2023Observed: 3.96 ft at 6:00PM Dec 05, 2023Observed: 3.97 ft at 6:15PM Dec 05, 2023Observed: 3.96 ft at 6:30PM Dec 05, 2023Observed: 3.95 ft at 6:45PM Dec 05, 2023Observed: 3.96 ft at 7:00PM Dec 05, 2023Observed: 3.96 ft at 7:15PM Dec 05, 2023Observed: 3.95 ft at 7:30PM Dec 05, 2023Observed: 3.96 ft at 7:45PM Dec 05, 2023Observed: 3.96 ft at 8:00PM Dec 05, 2023Observed: 3.96 ft at 8:15PM Dec 05, 2023Observed: 3.96 ft at 8:30PM Dec 05, 2023Observed: 3.96 ft at 8:45PM Dec 05, 2023Observed: 3.96 ft at 9:00PM Dec 05, 2023Observed: 3.96 ft at 9:15PM Dec 05, 2023Observed: 3.96 ft at 9:30PM Dec 05, 2023Observed: 3.96 ft at 9:45PM Dec 05, 2023Observed: 3.96 ft at 10:00PM Dec 05, 2023Observed: 3.96 ft at 10:15PM Dec 05, 2023Observed: 3.96 ft at 10:30PM Dec 05, 2023Observed: 3.96 ft at 10:45PM Dec 05, 2023Observed: 3.96 ft at 11:00PM Dec 05, 2023Observed: 3.96 ft at 11:15PM Dec 05, 2023Observed: 3.96 ft at 11:30PM Dec 05, 2023Observed: 3.95 ft at 11:45PM Dec 05, 2023Observed: 3.96 ft at 12:00AM Dec 06, 2023Observed: 3.95 ft at 12:15AM Dec 06, 2023Observed: 3.95 ft at 12:30AM Dec 06, 2023Observed: 3.95 ft at 12:45AM Dec 06, 2023Observed: 3.95 ft at 1:00AM Dec 06, 2023Observed: 3.95 ft at 1:15AM Dec 06, 2023Observed: 3.96 ft at 1:30AM Dec 06, 2023Observed: 3.96 ft at 1:45AM Dec 06, 2023Observed: 3.96 ft at 2:00AM Dec 06, 2023Observed: 3.96 ft at 2:15AM Dec 06, 2023Observed: 3.96 ft at 2:30AM Dec 06, 2023Observed: 3.96 ft at 2:45AM Dec 06, 2023Observed: 3.96 ft at 3:00AM Dec 06, 2023Observed: 3.96 ft at 3:15AM Dec 06, 2023Observed: 3.96 ft at 3:30AM Dec 06, 2023Observed: 3.95 ft at 3:45AM Dec 06, 2023Observed: 3.96 ft at 4:00AM Dec 06, 2023Observed: 3.95 ft at 4:15AM Dec 06, 2023Observed: 3.95 ft at 4:30AM Dec 06, 2023Observed: 3.95 ft at 4:45AM Dec 06, 2023Observed: 3.95 ft at 5:00AM Dec 06, 2023Observed: 3.95 ft at 5:15AM Dec 06, 2023Observed: 3.95 ft at 5:30AM Dec 06, 2023Observed: 3.95 ft at 5:45AM Dec 06, 2023Observed: 3.95 ft at 6:00AM Dec 06, 2023Observed: 3.95 ft at 6:15AM Dec 06, 2023Observed: 3.96 ft at 6:30AM Dec 06, 2023Observed: 3.96 ft at 6:45AM Dec 06, 2023Observed: 3.96 ft at 7:00AM Dec 06, 2023Observed: 3.96 ft at 7:15AM Dec 06, 2023Observed: 3.95 ft at 7:30AM Dec 06, 2023Observed: 3.96 ft at 7:45AM Dec 06, 2023Observed: 3.96 ft at 8:00AM Dec 06, 2023Observed: 3.95 ft at 8:15AM Dec 06, 2023Observed: 3.96 ft at 8:30AM Dec 06, 2023Observed: 3.95 ft at 8:45AM Dec 06, 2023Observed: 3.95 ft at 9:00AM Dec 06, 2023Observed: 3.95 ft at 9:15AM Dec 06, 2023Observed: 3.95 ft at 9:30AM Dec 06, 2023Observed: 3.95 ft at 9:45AM Dec 06, 2023Observed: 3.96 ft at 10:00AM Dec 06, 2023Observed: 3.95 ft at 10:15AM Dec 06, 2023Observed: 3.96 ft at 10:30AM Dec 06, 2023Observed: 3.95 ft at 10:45AM Dec 06, 2023Observed: 3.96 ft at 11:00AM Dec 06, 2023Observed: 3.96 ft at 11:15AM Dec 06, 2023Observed: 3.96 ft at 11:30AM Dec 06, 2023Observed: 3.96 ft at 11:45AM Dec 06, 2023Observed: 3.95 ft at 12:00PM Dec 06, 2023Observed: 3.96 ft at 12:15PM Dec 06, 2023Observed: 3.95 ft at 12:30PM Dec 06, 2023Observed: 3.95 ft at 12:45PM Dec 06, 2023Observed: 3.95 ft at 1:00PM Dec 06, 2023Observed: 3.95 ft at 1:15PM Dec 06, 2023Observed: 3.95 ft at 1:30PM Dec 06, 2023Observed: 3.95 ft at 1:45PM Dec 06, 2023Observed: 3.95 ft at 2:00PM Dec 06, 2023Observed: 3.95 ft at 2:15PM Dec 06, 2023Observed: 3.94 ft at 2:30PM Dec 06, 2023Observed: 3.95 ft at 2:45PM Dec 06, 2023Observed: 3.95 ft at 3:00PM Dec 06, 2023Observed: 3.94 ft at 3:15PM Dec 06, 2023Observed: 3.95 ft at 3:30PM Dec 06, 2023Observed: 3.95 ft at 3:45PM Dec 06, 2023Observed: 3.96 ft at 4:00PM Dec 06, 2023Observed: 3.96 ft at 4:15PM Dec 06, 2023Observed: 3.95 ft at 4:30PM Dec 06, 2023Observed: 3.95 ft at 4:45PM Dec 06, 2023Observed: 3.95 ft at 5:00PM Dec 06, 2023Observed: 3.95 ft at 5:15PM Dec 06, 2023Observed: 3.94 ft at 5:30PM Dec 06, 2023Observed: 3.95 ft at 5:45PM Dec 06, 2023Observed: 3.95 ft at 6:00PM Dec 06, 2023Observed: 3.95 ft at 6:15PM Dec 06, 2023Observed: 3.95 ft at 6:30PM Dec 06, 2023Observed: 3.95 ft at 6:45PM Dec 06, 2023Observed: 3.96 ft at 7:00PM Dec 06, 2023Observed: 3.95 ft at 7:15PM Dec 06, 2023Observed: 3.95 ft at 7:30PM Dec 06, 2023Observed: 3.95 ft at 7:45PM Dec 06, 2023Observed: 3.95 ft at 8:00PM Dec 06, 2023Observed: 3.95 ft at 8:15PM Dec 06, 2023Observed: 3.96 ft at 8:30PM Dec 06, 2023Observed: 3.96 ft at 8:45PM Dec 06, 2023Observed: 3.96 ft at 9:00PM Dec 06, 2023Observed: 3.96 ft at 9:15PM Dec 06, 2023Observed: 3.95 ft at 9:30PM Dec 06, 2023Observed: 3.95 ft at 9:45PM Dec 06, 2023Observed: 3.95 ft at 10:00PM Dec 06, 2023Observed: 3.95 ft at 10:15PM Dec 06, 2023Observed: 3.95 ft at 10:30PM Dec 06, 2023Observed: 3.96 ft at 10:45PM Dec 06, 2023Observed: 3.96 ft at 11:00PM Dec 06, 2023Observed: 3.95 ft at 11:15PM Dec 06, 2023Observed: 3.97 ft at 11:30PM Dec 06, 2023Observed: 3.96 ft at 11:45PM Dec 06, 2023Observed: 3.97 ft at 12:00AM Dec 07, 2023Observed: 3.97 ft at 12:15AM Dec 07, 2023Observed: 3.97 ft at 12:30AM Dec 07, 2023Observed: 3.97 ft at 12:45AM Dec 07, 2023Observed: 3.97 ft at 1:00AM Dec 07, 2023Observed: 3.97 ft at 1:15AM Dec 07, 2023Observed: 3.96 ft at 1:30AM Dec 07, 2023Observed: 3.96 ft at 1:45AM Dec 07, 2023Observed: 3.96 ft at 2:00AM Dec 07, 2023Observed: 3.96 ft at 2:15AM Dec 07, 2023Observed: 3.96 ft at 2:30AM Dec 07, 2023Observed: 3.96 ft at 2:45AM Dec 07, 2023Observed: 3.96 ft at 3:00AM Dec 07, 2023Observed: 3.96 ft at 3:15AM Dec 07, 2023Observed: 3.96 ft at 3:30AM Dec 07, 2023Observed: 3.95 ft at 3:45AM Dec 07, 2023Observed: 3.96 ft at 4:00AM Dec 07, 2023Observed: 3.97 ft at 4:15AM Dec 07, 2023Observed: 3.97 ft at 4:30AM Dec 07, 2023Observed: 3.97 ft at 4:45AM Dec 07, 2023Observed: 3.96 ft at 5:00AM Dec 07, 2023Observed: 3.97 ft at 5:15AM Dec 07, 2023Observed: 3.96 ft at 5:30AM Dec 07, 2023Observed: 3.96 ft at 5:45AM Dec 07, 2023Observed: 3.96 ft at 6:00AM Dec 07, 2023Observed: 3.96 ft at 6:15AM Dec 07, 2023Observed: 3.96 ft at 6:30AM Dec 07, 2023Observed: 3.96 ft at 6:45AM Dec 07, 2023Observed: 3.96 ft at 7:00AM Dec 07, 2023Observed: 3.95 ft at 7:15AM Dec 07, 2023Observed: 3.95 ft at 7:30AM Dec 07, 2023Observed: 3.96 ft at 7:45AM Dec 07, 2023Observed: 3.96 ft at 8:00AM Dec 07, 2023Observed: 3.96 ft at 8:15AM Dec 07, 2023Observed: 3.96 ft at 8:30AM Dec 07, 2023Observed: 3.97 ft at 8:45AM Dec 07, 2023Observed: 3.96 ft at 9:00AM Dec 07, 2023Observed: 3.96 ft at 9:15AM Dec 07, 2023Observed: 3.96 ft at 9:30AM Dec 07, 2023Observed: 3.97 ft at 9:45AM Dec 07, 2023Observed: 3.97 ft at 10:00AM Dec 07, 2023Observed: 3.97 ft at 10:15AM Dec 07, 2023Observed: 3.96 ft at 10:30AM Dec 07, 2023Observed: 3.96 ft at 10:45AM Dec 07, 2023Observed: 3.96 ft at 11:00AM Dec 07, 2023Observed: 3.95 ft at 11:15AM Dec 07, 2023Observed: 3.95 ft at 11:30AM Dec 07, 2023Observed: 3.96 ft at 11:45AM Dec 07, 2023Observed: 3.95 ft at 12:00PM Dec 07, 2023Observed: 3.95 ft at 12:15PM Dec 07, 2023Observed: 3.95 ft at 12:30PM Dec 07, 2023Observed: 3.95 ft at 12:45PM Dec 07, 2023Observed: 3.95 ft at 1:00PM Dec 07, 2023Observed: 3.96 ft at 1:15PM Dec 07, 2023Observed: 3.95 ft at 1:30PM Dec 07, 2023Observed: 3.95 ft at 1:45PM Dec 07, 2023Observed: 3.94 ft at 2:00PM Dec 07, 2023Observed: 3.95 ft at 2:15PM Dec 07, 2023Observed: 3.95 ft at 2:30PM Dec 07, 2023Observed: 3.95 ft at 2:45PM Dec 07, 2023Observed: 3.94 ft at 3:00PM Dec 07, 2023Observed: 3.94 ft at 3:15PM Dec 07, 2023Observed: 3.95 ft at 3:30PM Dec 07, 2023Observed: 3.95 ft at 3:45PM Dec 07, 2023Observed: 3.95 ft at 4:00PM Dec 07, 2023Observed: 3.95 ft at 4:15PM Dec 07, 2023Observed: 3.95 ft at 4:30PM Dec 07, 2023Observed: 3.95 ft at 4:45PM Dec 07, 2023Observed: 3.95 ft at 5:00PM Dec 07, 2023Observed: 3.95 ft at 5:15PM Dec 07, 2023Observed: 3.95 ft at 5:30PM Dec 07, 2023Observed: 3.95 ft at 5:45PM Dec 07, 2023Observed: 3.95 ft at 6:00PM Dec 07, 2023USGS--Water Resources of the United StatesRPOP4(plotting HGIRG) Graph Created (7:22PM Dec 7, 2023)ObservedLatest observed value: 3.95 ft at 6:00 PM AST 7-Dec-2023. Flood Stage is 15 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (AST)
XML Data
RSS Files
Datum: NGVD29
Metadata
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
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 15.76 ft on 04/28/2023 (P)
(2) 17.08 ft on 11/06/2022 (P)
(3) 17.14 ft on 09/19/2022 (P)
(4) 15.87 ft on 07/10/2022 (P)
(5) 16.49 ft on 10/20/2021 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 12.13 ft on 08/08/1974
Zoom Level:14
KML Image
Gauge LocationGauge Map Marker
 Disclaimer
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.
Flood Impacts & Photos Collapse
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
About This Location Collapse

Latitude: 18.407553° N, Longitude: 66.068944° W, Horizontal Datum: NAD27

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)		 Elevation
(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 16 Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:
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Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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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