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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: 1.96 ft at 12:15PM May 22, 2022Observed: 1.95 ft at 12:30PM May 22, 2022Observed: 1.96 ft at 12:45PM May 22, 2022Observed: 1.94 ft at 1:00PM May 22, 2022Observed: 1.96 ft at 1:15PM May 22, 2022Observed: 1.94 ft at 1:30PM May 22, 2022Observed: 1.96 ft at 2:11PM May 22, 2022Observed: 1.99 ft at 2:45PM May 22, 2022Observed: 1.98 ft at 3:00PM May 22, 2022Observed: 1.99 ft at 3:15PM May 22, 2022Observed: 1.99 ft at 3:30PM May 22, 2022Observed: 2 ft at 3:45PM May 22, 2022Observed: 2.02 ft at 4:00PM May 22, 2022Observed: 2.01 ft at 4:15PM May 22, 2022Observed: 2.01 ft at 4:30PM May 22, 2022Observed: 2 ft at 4:45PM May 22, 2022Observed: 2 ft at 5:00PM May 22, 2022Observed: 1.99 ft at 5:15PM May 22, 2022Observed: 1.98 ft at 5:30PM May 22, 2022Observed: 2 ft at 5:45PM May 22, 2022Observed: 1.98 ft at 6:00PM May 22, 2022Observed: 1.98 ft at 6:15PM May 22, 2022Observed: 1.99 ft at 6:30PM May 22, 2022Observed: 1.99 ft at 6:45PM May 22, 2022Observed: 2.02 ft at 7:00PM May 22, 2022Observed: 2.04 ft at 7:15PM May 22, 2022Observed: 2.05 ft at 7:30PM May 22, 2022Observed: 2.08 ft at 7:45PM May 22, 2022Observed: 2.08 ft at 8:00PM May 22, 2022Observed: 2.09 ft at 8:15PM May 22, 2022Observed: 2.1 ft at 8:30PM May 22, 2022Observed: 2.15 ft at 8:45PM May 22, 2022Observed: 2.22 ft at 9:00PM May 22, 2022Observed: 2.24 ft at 9:15PM May 22, 2022Observed: 2.24 ft at 9:30PM May 22, 2022Observed: 2.26 ft at 9:45PM May 22, 2022Observed: 2.26 ft at 10:00PM May 22, 2022Observed: 2.27 ft at 10:15PM May 22, 2022Observed: 2.27 ft at 10:17PM May 22, 2022Observed: 2.28 ft at 10:30PM May 22, 2022Observed: 2.27 ft at 10:45PM May 22, 2022Observed: 2.26 ft at 11:00PM May 22, 2022Observed: 2.25 ft at 11:15PM May 22, 2022Observed: 2.25 ft at 11:30PM May 22, 2022Observed: 2.24 ft at 11:45PM May 22, 2022Observed: 2.23 ft at 12:00AM May 23, 2022Observed: 2.22 ft at 12:15AM May 23, 2022Observed: 2.22 ft at 12:30AM May 23, 2022Observed: 2.17 ft at 1:45AM May 23, 2022Observed: 2.16 ft at 2:00AM May 23, 2022Observed: 2.15 ft at 2:15AM May 23, 2022Observed: 2.15 ft at 2:30AM May 23, 2022Observed: 2.15 ft at 2:45AM May 23, 2022Observed: 2.18 ft at 3:00AM May 23, 2022Observed: 2.2 ft at 3:15AM May 23, 2022Observed: 2.2 ft at 3:30AM May 23, 2022Observed: 2.2 ft at 3:45AM May 23, 2022Observed: 2.19 ft at 4:00AM May 23, 2022Observed: 2.18 ft at 4:15AM May 23, 2022Observed: 2.18 ft at 4:30AM May 23, 2022Observed: 2.17 ft at 4:45AM May 23, 2022Observed: 2.17 ft at 5:00AM May 23, 2022Observed: 2.16 ft at 5:15AM May 23, 2022Observed: 2.16 ft at 5:30AM May 23, 2022Observed: 2.15 ft at 5:45AM May 23, 2022Observed: 2.15 ft at 6:00AM May 23, 2022Observed: 2.16 ft at 6:15AM May 23, 2022Observed: 2.16 ft at 6:17AM May 23, 2022Observed: 2.15 ft at 6:30AM May 23, 2022Observed: 2.14 ft at 6:45AM May 23, 2022Observed: 2.15 ft at 7:00AM May 23, 2022Observed: 2.14 ft at 7:15AM May 23, 2022Observed: 2.13 ft at 7:30AM May 23, 2022Observed: 2.14 ft at 7:45AM May 23, 2022Observed: 2.12 ft at 8:00AM May 23, 2022Observed: 2.11 ft at 8:15AM May 23, 2022Observed: 2.13 ft at 8:30AM May 23, 2022Observed: 2.11 ft at 8:45AM May 23, 2022Observed: 2.11 ft at 9:00AM May 23, 2022Observed: 2.11 ft at 9:15AM May 23, 2022Observed: 2.1 ft at 9:30AM May 23, 2022Observed: 2.09 ft at 9:45AM May 23, 2022Observed: 2.1 ft at 10:00AM May 23, 2022Observed: 2.1 ft at 10:15AM May 23, 2022Observed: 2.09 ft at 10:30AM May 23, 2022Observed: 2.09 ft at 10:45AM May 23, 2022Observed: 2.06 ft at 11:00AM May 23, 2022Observed: 2.07 ft at 11:15AM May 23, 2022Observed: 2.06 ft at 11:30AM May 23, 2022Observed: 2.06 ft at 11:45AM May 23, 2022Observed: 2.06 ft at 12:00PM May 23, 2022Observed: 2.06 ft at 12:15PM May 23, 2022Observed: 2.07 ft at 12:30PM May 23, 2022Observed: 2.07 ft at 12:45PM May 23, 2022Observed: 2.09 ft at 1:00PM May 23, 2022Observed: 2.1 ft at 1:15PM May 23, 2022Observed: 2.1 ft at 1:30PM May 23, 2022Observed: 2.11 ft at 1:45PM May 23, 2022Observed: 2.11 ft at 2:00PM May 23, 2022Observed: 2.1 ft at 2:15PM May 23, 2022Observed: 2.1 ft at 2:16PM May 23, 2022Observed: 2.08 ft at 2:30PM May 23, 2022Observed: 2.09 ft at 2:45PM May 23, 2022Observed: 2.07 ft at 3:00PM May 23, 2022Observed: 2.1 ft at 3:15PM May 23, 2022Observed: 2.09 ft at 3:30PM May 23, 2022Observed: 2.08 ft at 3:45PM May 23, 2022Observed: 2.06 ft at 4:00PM May 23, 2022Observed: 2.07 ft at 4:15PM May 23, 2022Observed: 2.07 ft at 4:30PM May 23, 2022Observed: 2.06 ft at 4:45PM May 23, 2022Observed: 2.05 ft at 5:00PM May 23, 2022Observed: 2.06 ft at 5:15PM May 23, 2022Observed: 2.05 ft at 5:30PM May 23, 2022Observed: 2.05 ft at 5:45PM May 23, 2022Observed: 2.05 ft at 6:00PM May 23, 2022Observed: 2.05 ft at 6:15PM May 23, 2022Observed: 2.04 ft at 6:30PM May 23, 2022Observed: 2.04 ft at 6:45PM May 23, 2022Observed: 2.07 ft at 7:00PM May 23, 2022Observed: 2.16 ft at 7:15PM May 23, 2022Observed: 2.24 ft at 7:30PM May 23, 2022Observed: 2.28 ft at 7:45PM May 23, 2022Observed: 2.28 ft at 8:00PM May 23, 2022Observed: 2.27 ft at 8:15PM May 23, 2022Observed: 2.27 ft at 8:30PM May 23, 2022Observed: 2.26 ft at 8:45PM May 23, 2022Observed: 2.25 ft at 9:00PM May 23, 2022Observed: 2.23 ft at 9:15PM May 23, 2022Observed: 2.23 ft at 9:30PM May 23, 2022Observed: 2.2 ft at 10:17PM May 23, 2022Observed: 2.17 ft at 10:45PM May 23, 2022Observed: 2.24 ft at 11:00PM May 23, 2022Observed: 2.35 ft at 11:15PM May 23, 2022Observed: 2.36 ft at 11:30PM May 23, 2022Observed: 2.37 ft at 11:45PM May 23, 2022Observed: 2.36 ft at 12:00AM May 24, 2022Observed: 2.35 ft at 12:15AM May 24, 2022Observed: 2.34 ft at 12:30AM May 24, 2022Observed: 2.34 ft at 12:45AM May 24, 2022Observed: 2.31 ft at 1:00AM May 24, 2022Observed: 2.32 ft at 1:15AM May 24, 2022Observed: 2.31 ft at 1:30AM May 24, 2022Observed: 2.29 ft at 1:45AM May 24, 2022Observed: 2.3 ft at 2:00AM May 24, 2022Observed: 2.29 ft at 2:15AM May 24, 2022Observed: 2.28 ft at 2:30AM May 24, 2022Observed: 2.28 ft at 2:45AM May 24, 2022Observed: 2.27 ft at 3:00AM May 24, 2022Observed: 2.26 ft at 3:15AM May 24, 2022Observed: 2.26 ft at 3:30AM May 24, 2022Observed: 2.21 ft at 4:45AM May 24, 2022Observed: 2.22 ft at 5:00AM May 24, 2022Observed: 2.21 ft at 5:15AM May 24, 2022Observed: 2.2 ft at 5:30AM May 24, 2022Observed: 2.2 ft at 5:45AM May 24, 2022Observed: 2.21 ft at 6:00AM May 24, 2022Observed: 2.2 ft at 6:15AM May 24, 2022Observed: 2.19 ft at 6:21AM May 24, 2022Observed: 2.18 ft at 6:30AM May 24, 2022Observed: 2.18 ft at 6:45AM May 24, 2022Observed: 2.17 ft at 7:00AM May 24, 2022Observed: 2.17 ft at 7:15AM May 24, 2022Observed: 2.17 ft at 7:30AM May 24, 2022Observed: 2.17 ft at 7:45AM May 24, 2022Observed: 2.17 ft at 8:00AM May 24, 2022Observed: 2.16 ft at 8:15AM May 24, 2022Observed: 2.15 ft at 8:30AM May 24, 2022Observed: 2.16 ft at 8:45AM May 24, 2022Observed: 2.16 ft at 9:00AM May 24, 2022Observed: 2.14 ft at 9:15AM May 24, 2022Observed: 2.14 ft at 9:30AM May 24, 2022Observed: 2.15 ft at 9:45AM May 24, 2022Observed: 2.14 ft at 10:00AM May 24, 2022Observed: 2.11 ft at 10:15AM May 24, 2022Observed: 2.13 ft at 10:30AM May 24, 2022Observed: 2.13 ft at 10:45AM May 24, 2022Observed: 2.11 ft at 11:00AM May 24, 2022Observed: 2.11 ft at 11:15AM May 24, 2022Observed: 2.11 ft at 11:30AM May 24, 2022Observed: 2.1 ft at 11:45AM May 24, 2022Observed: 2.1 ft at 12:00PM May 24, 2022Observed: 2.09 ft at 12:15PM May 24, 2022Observed: 2.09 ft at 12:30PM May 24, 2022Observed: 2.1 ft at 12:45PM May 24, 2022Observed: 2.1 ft at 1:00PM May 24, 2022Observed: 2.09 ft at 1:15PM May 24, 2022Observed: 2.13 ft at 1:30PM May 24, 2022Observed: 2.14 ft at 1:45PM May 24, 2022Observed: 2.15 ft at 2:00PM May 24, 2022Observed: 2.14 ft at 2:15PM May 24, 2022Observed: 2.13 ft at 2:21PM May 24, 2022Observed: 2.14 ft at 2:30PM May 24, 2022Observed: 2.13 ft at 2:45PM May 24, 2022Observed: 2.12 ft at 3:00PM May 24, 2022Observed: 2.12 ft at 3:15PM May 24, 2022Observed: 2.13 ft at 3:30PM May 24, 2022Highest Observation: 5.16 ft at 4:45PM May 24, 2022Observed: 4.86 ft at 5:00PM May 24, 2022Observed: 4.85 ft at 5:15PM May 24, 2022Observed: 4.43 ft at 5:30PM May 24, 2022Observed: 4.39 ft at 5:45PM May 24, 2022Observed: 4.08 ft at 6:00PM May 24, 2022Observed: 3.85 ft at 6:15PM May 24, 2022Observed: 3.76 ft at 6:30PM May 24, 2022Observed: 3.31 ft at 7:45PM May 24, 2022Observed: 3.22 ft at 8:00PM May 24, 2022Observed: 3.17 ft at 8:15PM May 24, 2022Observed: 3.12 ft at 8:30PM May 24, 2022Observed: 3.01 ft at 8:45PM May 24, 2022Observed: 2.97 ft at 9:00PM May 24, 2022Observed: 2.93 ft at 9:15PM May 24, 2022Observed: 2.87 ft at 9:30PM May 24, 2022Observed: 2.73 ft at 10:45PM May 24, 2022Observed: 2.71 ft at 11:00PM May 24, 2022Observed: 2.68 ft at 11:15PM May 24, 2022Observed: 2.68 ft at 11:30PM May 24, 2022Observed: 2.65 ft at 11:45PM May 24, 2022Observed: 2.62 ft at 12:00AM May 25, 2022Observed: 2.61 ft at 12:15AM May 25, 2022Observed: 2.58 ft at 12:30AM May 25, 2022Observed: 2.57 ft at 12:45AM May 25, 2022Observed: 2.55 ft at 1:00AM May 25, 2022Observed: 2.53 ft at 1:15AM May 25, 2022Observed: 2.53 ft at 1:30AM May 25, 2022Observed: 2.51 ft at 1:45AM May 25, 2022Observed: 2.5 ft at 2:00AM May 25, 2022Observed: 2.5 ft at 2:15AM May 25, 2022Observed: 2.49 ft at 2:30AM May 25, 2022Observed: 2.47 ft at 2:45AM May 25, 2022Observed: 2.46 ft at 3:00AM May 25, 2022Observed: 2.45 ft at 3:15AM May 25, 2022Observed: 2.42 ft at 3:30AM May 25, 2022Observed: 2.42 ft at 3:45AM May 25, 2022Observed: 2.42 ft at 4:00AM May 25, 2022Observed: 2.41 ft at 4:15AM May 25, 2022Observed: 2.4 ft at 4:30AM May 25, 2022Observed: 2.39 ft at 4:45AM May 25, 2022Observed: 2.39 ft at 5:00AM May 25, 2022Observed: 2.38 ft at 5:15AM May 25, 2022Observed: 2.38 ft at 5:30AM May 25, 2022Observed: 2.36 ft at 5:45AM May 25, 2022Observed: 2.35 ft at 6:00AM May 25, 2022Observed: 2.35 ft at 6:15AM May 25, 2022Observed: 2.34 ft at 6:26AM May 25, 2022Observed: 2.34 ft at 6:30AM May 25, 2022Observed: 2.33 ft at 6:45AM May 25, 2022Observed: 2.33 ft at 7:00AM May 25, 2022Observed: 2.33 ft at 7:15AM May 25, 2022Observed: 2.33 ft at 7:30AM May 25, 2022Observed: 2.33 ft at 7:45AM May 25, 2022Observed: 2.32 ft at 8:00AM May 25, 2022Observed: 2.31 ft at 8:15AM May 25, 2022Observed: 2.3 ft at 8:30AM May 25, 2022Observed: 2.3 ft at 8:45AM May 25, 2022Observed: 2.3 ft at 9:00AM May 25, 2022Observed: 2.3 ft at 9:15AM May 25, 2022Observed: 2.3 ft at 9:30AM May 25, 2022Observed: 2.25 ft at 10:45AM May 25, 2022Observed: 2.26 ft at 11:00AM May 25, 2022Observed: 2.26 ft at 11:15AM May 25, 2022Observed: 2.24 ft at 11:30AM May 25, 2022USGS--Water Resources of the United StatesMAYP4(plotting HGIRG) Graph Created (12:07PM May 25, 2022)ObservedLatest observed value: 2.24 ft at 11:30 AM AST 25-May-2022. Flood Stage is 9.5 ft
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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) 13.64 ft on 08/24/1988
(4) 12.67 ft on 10/07/1985
(5) 12.54 ft on 09/30/1992
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 11.57 ft on 06/10/2021 (P)
(2) 10.50 ft on 07/30/2020 (P)
(3) 19.50 ft on 09/20/2017 (P)
(4) 7.82 ft on 09/13/2016
(5) 12.08 ft on 09/23/2015
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
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