Skip Navigation Link weather.gov  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left Home News Organization
Bookmark and Share Navigation Bar End Cap

  

National Conditions
    Rivers
    Satellite
    Climate
    Observed Precip

Local Conditions
    Warnings
    Weather Forecast
    Radar

AHPS Documentation
    User Guide
    User Brochure

What is AHPS?
    Facts
    Our Partners

Feedback/Questions
     Provide Feedback
    Ask Questions

When flooded turn around don't drown
FloodSmart
USA.gov Official Web Portal
 

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 March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.



San Juan Radar Outage Impacts Precipitation Estimates.. read more here
Hydrograph River at a Glance Download
Rio Rosario near Hormigueros Stage (ft)Flow (kcfs)Observed: 2.24 ft at 2:30PM Sep 18, 2023Observed: 2.24 ft at 2:45PM Sep 18, 2023Observed: 2.24 ft at 3:00PM Sep 18, 2023Observed: 2.25 ft at 3:15PM Sep 18, 2023Observed: 2.23 ft at 3:30PM Sep 18, 2023Observed: 2.23 ft at 3:45PM Sep 18, 2023Observed: 2.23 ft at 4:00PM Sep 18, 2023Observed: 2.23 ft at 4:15PM Sep 18, 2023Observed: 2.22 ft at 4:30PM Sep 18, 2023Observed: 2.23 ft at 4:45PM Sep 18, 2023Observed: 2.22 ft at 5:00PM Sep 18, 2023Observed: 2.23 ft at 5:15PM Sep 18, 2023Observed: 2.22 ft at 5:30PM Sep 18, 2023Observed: 2.23 ft at 5:45PM Sep 18, 2023Observed: 2.22 ft at 6:00PM Sep 18, 2023Observed: 2.21 ft at 6:15PM Sep 18, 2023Observed: 2.21 ft at 6:30PM Sep 18, 2023Observed: 2.21 ft at 6:45PM Sep 18, 2023Observed: 2.23 ft at 7:00PM Sep 18, 2023Observed: 2.23 ft at 7:15PM Sep 18, 2023Observed: 2.26 ft at 7:30PM Sep 18, 2023Observed: 2.29 ft at 7:45PM Sep 18, 2023Observed: 2.32 ft at 8:00PM Sep 18, 2023Observed: 2.29 ft at 8:15PM Sep 18, 2023Observed: 2.27 ft at 8:30PM Sep 18, 2023Observed: 2.26 ft at 8:45PM Sep 18, 2023Observed: 2.25 ft at 9:00PM Sep 18, 2023Observed: 2.25 ft at 9:15PM Sep 18, 2023Observed: 2.25 ft at 9:30PM Sep 18, 2023Observed: 2.24 ft at 9:45PM Sep 18, 2023Observed: 2.24 ft at 10:00PM Sep 18, 2023Observed: 2.25 ft at 10:15PM Sep 18, 2023Observed: 2.24 ft at 10:30PM Sep 18, 2023Observed: 2.25 ft at 10:45PM Sep 18, 2023Observed: 2.25 ft at 11:00PM Sep 18, 2023Observed: 2.24 ft at 11:15PM Sep 18, 2023Observed: 2.24 ft at 11:30PM Sep 18, 2023Observed: 2.23 ft at 11:45PM Sep 18, 2023Observed: 2.24 ft at 12:00AM Sep 19, 2023Observed: 2.31 ft at 12:15AM Sep 19, 2023Observed: 2.44 ft at 12:30AM Sep 19, 2023Observed: 2.48 ft at 12:45AM Sep 19, 2023Observed: 2.48 ft at 1:00AM Sep 19, 2023Observed: 2.46 ft at 1:15AM Sep 19, 2023Observed: 2.44 ft at 1:30AM Sep 19, 2023Observed: 2.44 ft at 1:45AM Sep 19, 2023Observed: 2.42 ft at 2:00AM Sep 19, 2023Observed: 2.41 ft at 2:15AM Sep 19, 2023Observed: 2.4 ft at 2:30AM Sep 19, 2023Observed: 2.38 ft at 2:45AM Sep 19, 2023Observed: 2.35 ft at 3:00AM Sep 19, 2023Observed: 2.35 ft at 3:15AM Sep 19, 2023Observed: 2.34 ft at 3:30AM Sep 19, 2023Observed: 2.33 ft at 3:45AM Sep 19, 2023Observed: 2.32 ft at 4:00AM Sep 19, 2023Observed: 2.33 ft at 4:15AM Sep 19, 2023Observed: 2.31 ft at 4:30AM Sep 19, 2023Observed: 2.3 ft at 4:45AM Sep 19, 2023Observed: 2.3 ft at 5:00AM Sep 19, 2023Observed: 2.29 ft at 5:15AM Sep 19, 2023Observed: 2.28 ft at 5:30AM Sep 19, 2023Observed: 2.29 ft at 5:45AM Sep 19, 2023Observed: 2.28 ft at 6:00AM Sep 19, 2023Observed: 2.27 ft at 6:15AM Sep 19, 2023Observed: 2.27 ft at 6:30AM Sep 19, 2023Observed: 2.27 ft at 6:45AM Sep 19, 2023Observed: 2.26 ft at 7:00AM Sep 19, 2023Observed: 2.27 ft at 7:15AM Sep 19, 2023Observed: 2.27 ft at 7:30AM Sep 19, 2023Observed: 2.25 ft at 7:45AM Sep 19, 2023Observed: 2.26 ft at 8:00AM Sep 19, 2023Observed: 2.27 ft at 8:15AM Sep 19, 2023Observed: 2.25 ft at 8:30AM Sep 19, 2023Observed: 2.26 ft at 8:45AM Sep 19, 2023Observed: 2.25 ft at 9:00AM Sep 19, 2023Observed: 2.25 ft at 9:15AM Sep 19, 2023Observed: 2.24 ft at 9:30AM Sep 19, 2023Observed: 2.23 ft at 9:45AM Sep 19, 2023Observed: 2.24 ft at 10:00AM Sep 19, 2023Observed: 2.23 ft at 10:15AM Sep 19, 2023Observed: 2.24 ft at 10:30AM Sep 19, 2023Observed: 2.23 ft at 10:45AM Sep 19, 2023Observed: 2.23 ft at 11:00AM Sep 19, 2023Observed: 2.23 ft at 11:15AM Sep 19, 2023Observed: 2.23 ft at 11:30AM Sep 19, 2023Observed: 2.21 ft at 11:45AM Sep 19, 2023Observed: 2.22 ft at 12:00PM Sep 19, 2023Observed: 2.21 ft at 12:15PM Sep 19, 2023Observed: 2.19 ft at 12:30PM Sep 19, 2023Observed: 2.19 ft at 12:45PM Sep 19, 2023Observed: 2.2 ft at 1:00PM Sep 19, 2023Observed: 2.19 ft at 1:15PM Sep 19, 2023Observed: 2.2 ft at 1:30PM Sep 19, 2023Observed: 2.2 ft at 1:45PM Sep 19, 2023Observed: 2.2 ft at 2:00PM Sep 19, 2023Observed: 2.2 ft at 2:15PM Sep 19, 2023Observed: 2.2 ft at 2:20PM Sep 19, 2023Observed: 2.18 ft at 2:30PM Sep 19, 2023Observed: 2.18 ft at 2:45PM Sep 19, 2023Observed: 2.19 ft at 3:00PM Sep 19, 2023Observed: 2.19 ft at 3:15PM Sep 19, 2023Observed: 2.19 ft at 3:30PM Sep 19, 2023Observed: 2.18 ft at 3:45PM Sep 19, 2023Observed: 2.19 ft at 4:00PM Sep 19, 2023Observed: 2.19 ft at 4:15PM Sep 19, 2023Observed: 2.19 ft at 4:30PM Sep 19, 2023Observed: 2.19 ft at 4:45PM Sep 19, 2023Observed: 2.18 ft at 5:00PM Sep 19, 2023Observed: 2.18 ft at 5:15PM Sep 19, 2023Observed: 2.19 ft at 5:30PM Sep 19, 2023Observed: 2.18 ft at 5:45PM Sep 19, 2023Observed: 2.18 ft at 6:00PM Sep 19, 2023Observed: 2.18 ft at 6:15PM Sep 19, 2023Observed: 2.18 ft at 6:30PM Sep 19, 2023Observed: 2.19 ft at 6:45PM Sep 19, 2023Observed: 2.19 ft at 7:00PM Sep 19, 2023Observed: 2.18 ft at 7:15PM Sep 19, 2023Observed: 2.18 ft at 7:30PM Sep 19, 2023Observed: 2.18 ft at 7:45PM Sep 19, 2023Observed: 2.18 ft at 8:00PM Sep 19, 2023Observed: 2.17 ft at 8:15PM Sep 19, 2023Observed: 2.2 ft at 8:30PM Sep 19, 2023Observed: 2.2 ft at 8:45PM Sep 19, 2023Observed: 2.2 ft at 9:00PM Sep 19, 2023Observed: 2.21 ft at 9:15PM Sep 19, 2023Observed: 2.2 ft at 9:30PM Sep 19, 2023Observed: 2.19 ft at 10:20PM Sep 19, 2023Observed: 2.18 ft at 10:45PM Sep 19, 2023Observed: 2.19 ft at 11:00PM Sep 19, 2023Observed: 2.17 ft at 11:15PM Sep 19, 2023Observed: 2.18 ft at 11:30PM Sep 19, 2023Observed: 2.18 ft at 11:45PM Sep 19, 2023Observed: 2.18 ft at 12:00AM Sep 20, 2023Observed: 2.18 ft at 12:15AM Sep 20, 2023Observed: 2.17 ft at 12:30AM Sep 20, 2023Observed: 2.18 ft at 12:45AM Sep 20, 2023Observed: 2.17 ft at 1:00AM Sep 20, 2023Observed: 2.17 ft at 1:15AM Sep 20, 2023Observed: 2.17 ft at 1:30AM Sep 20, 2023Observed: 2.17 ft at 1:45AM Sep 20, 2023Observed: 2.16 ft at 2:00AM Sep 20, 2023Observed: 2.16 ft at 2:15AM Sep 20, 2023Observed: 2.17 ft at 2:30AM Sep 20, 2023Observed: 2.16 ft at 2:45AM Sep 20, 2023Observed: 2.16 ft at 3:00AM Sep 20, 2023Observed: 2.16 ft at 3:15AM Sep 20, 2023Observed: 2.16 ft at 3:30AM Sep 20, 2023Observed: 2.16 ft at 3:45AM Sep 20, 2023Observed: 2.17 ft at 4:00AM Sep 20, 2023Observed: 2.17 ft at 4:15AM Sep 20, 2023Observed: 2.17 ft at 4:30AM Sep 20, 2023Observed: 2.16 ft at 4:45AM Sep 20, 2023Observed: 2.16 ft at 5:00AM Sep 20, 2023Observed: 2.17 ft at 5:15AM Sep 20, 2023Observed: 2.16 ft at 5:30AM Sep 20, 2023Observed: 2.17 ft at 5:45AM Sep 20, 2023Observed: 2.16 ft at 6:00AM Sep 20, 2023Observed: 2.15 ft at 6:15AM Sep 20, 2023Observed: 2.15 ft at 6:20AM Sep 20, 2023Observed: 2.16 ft at 6:30AM Sep 20, 2023Observed: 2.16 ft at 6:45AM Sep 20, 2023Observed: 2.16 ft at 7:00AM Sep 20, 2023Observed: 2.17 ft at 7:15AM Sep 20, 2023Observed: 2.17 ft at 7:30AM Sep 20, 2023Observed: 2.17 ft at 7:45AM Sep 20, 2023Observed: 2.16 ft at 8:00AM Sep 20, 2023Observed: 2.17 ft at 8:15AM Sep 20, 2023Observed: 2.17 ft at 8:30AM Sep 20, 2023Observed: 2.17 ft at 8:45AM Sep 20, 2023Observed: 2.17 ft at 9:00AM Sep 20, 2023Observed: 2.17 ft at 9:15AM Sep 20, 2023Observed: 2.16 ft at 9:30AM Sep 20, 2023Observed: 2.17 ft at 9:45AM Sep 20, 2023Observed: 2.17 ft at 10:00AM Sep 20, 2023Observed: 2.15 ft at 10:15AM Sep 20, 2023Observed: 2.16 ft at 10:30AM Sep 20, 2023Observed: 2.16 ft at 10:45AM Sep 20, 2023Observed: 2.16 ft at 11:00AM Sep 20, 2023Observed: 2.16 ft at 11:15AM Sep 20, 2023Observed: 2.16 ft at 11:30AM Sep 20, 2023Observed: 2.14 ft at 11:45AM Sep 20, 2023Observed: 2.15 ft at 12:00PM Sep 20, 2023Observed: 2.15 ft at 12:15PM Sep 20, 2023Observed: 2.14 ft at 12:30PM Sep 20, 2023Observed: 2.13 ft at 12:45PM Sep 20, 2023Observed: 2.15 ft at 1:00PM Sep 20, 2023Observed: 2.14 ft at 1:15PM Sep 20, 2023Observed: 2.14 ft at 1:30PM Sep 20, 2023Observed: 2.14 ft at 1:45PM Sep 20, 2023Observed: 2.14 ft at 2:00PM Sep 20, 2023Observed: 2.13 ft at 2:15PM Sep 20, 2023Observed: 2.12 ft at 2:20PM Sep 20, 2023Observed: 2.14 ft at 2:30PM Sep 20, 2023Observed: 2.14 ft at 2:45PM Sep 20, 2023Observed: 2.14 ft at 3:00PM Sep 20, 2023Observed: 2.14 ft at 3:15PM Sep 20, 2023Observed: 2.14 ft at 3:30PM Sep 20, 2023Observed: 2.15 ft at 3:45PM Sep 20, 2023Observed: 2.14 ft at 4:00PM Sep 20, 2023Observed: 2.14 ft at 4:15PM Sep 20, 2023Observed: 2.15 ft at 4:30PM Sep 20, 2023Observed: 2.13 ft at 4:45PM Sep 20, 2023Observed: 2.14 ft at 5:00PM Sep 20, 2023Observed: 2.18 ft at 5:15PM Sep 20, 2023Observed: 2.22 ft at 5:30PM Sep 20, 2023Observed: 2.21 ft at 5:45PM Sep 20, 2023Observed: 2.21 ft at 6:00PM Sep 20, 2023Observed: 2.25 ft at 6:15PM Sep 20, 2023Observed: 2.27 ft at 6:30PM Sep 20, 2023Observed: 2.29 ft at 6:45PM Sep 20, 2023Observed: 2.35 ft at 7:00PM Sep 20, 2023Observed: 2.58 ft at 7:15PM Sep 20, 2023Observed: 2.74 ft at 7:30PM Sep 20, 2023Observed: 3.16 ft at 7:45PM Sep 20, 2023Observed: 4.33 ft at 8:00PM Sep 20, 2023Highest Observation: 4.38 ft at 8:15PM Sep 20, 2023Observed: 4.37 ft at 8:30PM Sep 20, 2023Observed: 4.28 ft at 8:45PM Sep 20, 2023Observed: 4.2 ft at 9:00PM Sep 20, 2023Observed: 4.01 ft at 9:15PM Sep 20, 2023Observed: 3.89 ft at 9:30PM Sep 20, 2023Observed: 3.78 ft at 9:45PM Sep 20, 2023Observed: 3.7 ft at 10:00PM Sep 20, 2023Observed: 3.58 ft at 10:15PM Sep 20, 2023Observed: 3.55 ft at 10:25PM Sep 20, 2023Observed: 3.5 ft at 10:30PM Sep 20, 2023Observed: 3.5 ft at 10:45PM Sep 20, 2023Observed: 3.44 ft at 11:00PM Sep 20, 2023Observed: 3.42 ft at 11:15PM Sep 20, 2023Observed: 3.36 ft at 11:30PM Sep 20, 2023Observed: 3.31 ft at 11:45PM Sep 20, 2023Observed: 3.29 ft at 12:00AM Sep 21, 2023Observed: 3.25 ft at 12:15AM Sep 21, 2023Observed: 3.21 ft at 12:30AM Sep 21, 2023Observed: 3.16 ft at 12:45AM Sep 21, 2023Observed: 3.11 ft at 1:00AM Sep 21, 2023Observed: 3.09 ft at 1:15AM Sep 21, 2023Observed: 3.05 ft at 1:30AM Sep 21, 2023Observed: 3.03 ft at 1:45AM Sep 21, 2023Observed: 3 ft at 2:00AM Sep 21, 2023Observed: 2.98 ft at 2:15AM Sep 21, 2023Observed: 2.96 ft at 2:30AM Sep 21, 2023Observed: 2.94 ft at 2:45AM Sep 21, 2023Observed: 2.93 ft at 3:00AM Sep 21, 2023Observed: 2.89 ft at 3:15AM Sep 21, 2023Observed: 2.88 ft at 3:30AM Sep 21, 2023Observed: 2.86 ft at 3:45AM Sep 21, 2023Observed: 2.84 ft at 4:00AM Sep 21, 2023Observed: 2.83 ft at 4:15AM Sep 21, 2023Observed: 2.8 ft at 4:30AM Sep 21, 2023Observed: 2.79 ft at 4:45AM Sep 21, 2023Observed: 2.79 ft at 5:00AM Sep 21, 2023Observed: 2.76 ft at 5:15AM Sep 21, 2023Observed: 2.75 ft at 5:30AM Sep 21, 2023Observed: 2.74 ft at 5:45AM Sep 21, 2023Observed: 2.73 ft at 6:00AM Sep 21, 2023Observed: 2.71 ft at 6:15AM Sep 21, 2023Observed: 2.71 ft at 6:25AM Sep 21, 2023Observed: 2.7 ft at 6:30AM Sep 21, 2023Observed: 2.69 ft at 6:45AM Sep 21, 2023Observed: 2.67 ft at 7:00AM Sep 21, 2023Observed: 2.66 ft at 7:15AM Sep 21, 2023Observed: 2.65 ft at 7:30AM Sep 21, 2023Observed: 2.65 ft at 7:45AM Sep 21, 2023Observed: 2.63 ft at 8:00AM Sep 21, 2023Observed: 2.63 ft at 8:15AM Sep 21, 2023Observed: 2.61 ft at 8:30AM Sep 21, 2023Observed: 2.6 ft at 8:45AM Sep 21, 2023Observed: 2.61 ft at 9:00AM Sep 21, 2023Observed: 2.6 ft at 9:15AM Sep 21, 2023Observed: 2.58 ft at 9:30AM Sep 21, 2023Observed: 2.57 ft at 9:45AM Sep 21, 2023Observed: 2.57 ft at 10:00AM Sep 21, 2023Observed: 2.56 ft at 10:15AM Sep 21, 2023Observed: 2.55 ft at 10:30AM Sep 21, 2023Observed: 2.53 ft at 10:45AM Sep 21, 2023Observed: 2.54 ft at 11:00AM Sep 21, 2023Observed: 2.53 ft at 11:15AM Sep 21, 2023Observed: 2.52 ft at 11:30AM Sep 21, 2023Observed: 2.5 ft at 11:45AM Sep 21, 2023Observed: 2.5 ft at 12:00PM Sep 21, 2023Observed: 2.49 ft at 12:15PM Sep 21, 2023Observed: 2.47 ft at 12:30PM Sep 21, 2023Observed: 2.47 ft at 12:45PM Sep 21, 2023Observed: 2.47 ft at 1:00PM Sep 21, 2023Observed: 2.45 ft at 1:15PM Sep 21, 2023Observed: 2.44 ft at 1:30PM Sep 21, 2023USGS--Water Resources of the United StatesMAYP4(plotting HGIRG) Graph Created (2:23PM Sep 21, 2023)ObservedLatest observed value: 2.44 ft at 1:30 PM AST 21-Sep-2023. Flood Stage is 9.5 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 Rosario near Hormigueros. Only observed stages are available for this point.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 13
Flood Stage: 9.5
Action Stage: 6
Low Stage (in feet): -9999

Historic Crests
(1) 19.50 ft on 09/20/2017 (P)
(2) 18.66 ft on 09/22/1998
(3) 14.87 ft on 09/18/2022 (P)
(4) 13.64 ft on 08/24/1988
(5) 12.67 ft on 10/07/1985
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 14.87 ft on 09/18/2022 (P)
(2) 12.40 ft on 08/11/2022 (P)
(3) 11.57 ft on 06/10/2021 (P)
(4) 10.50 ft on 07/30/2020 (P)
(5) 19.50 ft on 09/20/2017 (P)
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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
10 Community San Jose, streets Jose Caballero and San Jose flooded. OMS/7.2019
About This Location Collapse

Latitude: 18.158099° N, Longitude: 67.085388° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 9.5 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 29 164 174 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:
Resources Collapse
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
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:30 PM 		Disclaimer
Credits
Glossary 		Privacy Policy
About Us
Career Opportunities