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FloodSmart
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San Juan Radar Outage Impacts Precipitation Estimates.. read more here
Hydrograph River at a Glance Download
Rio Guanajibo near Hormigueros Stage (ft)Flow (kcfs)Observed: 11.12 ft at 10:15PM Dec 01, 2021Observed: 11.11 ft at 10:30PM Dec 01, 2021Observed: 11.1 ft at 10:45PM Dec 01, 2021Observed: 11.07 ft at 11:15PM Dec 01, 2021Observed: 11.08 ft at 11:30PM Dec 01, 2021Observed: 11.06 ft at 11:45PM Dec 01, 2021Observed: 11.07 ft at 12:00AM Dec 02, 2021Observed: 11.07 ft at 12:15AM Dec 02, 2021Observed: 11.09 ft at 12:30AM Dec 02, 2021Observed: 11.11 ft at 1:00AM Dec 02, 2021Observed: 11.12 ft at 1:15AM Dec 02, 2021Observed: 11.13 ft at 1:30AM Dec 02, 2021Observed: 11.18 ft at 2:00AM Dec 02, 2021Observed: 11.19 ft at 2:30AM Dec 02, 2021Observed: 11.19 ft at 2:45AM Dec 02, 2021Observed: 11.18 ft at 3:00AM Dec 02, 2021Observed: 11.19 ft at 3:30AM Dec 02, 2021Observed: 11.17 ft at 3:45AM Dec 02, 2021Observed: 11.17 ft at 4:00AM Dec 02, 2021Observed: 11.15 ft at 4:15AM Dec 02, 2021Observed: 11.13 ft at 4:30AM Dec 02, 2021Observed: 11.12 ft at 4:45AM Dec 02, 2021Observed: 11.11 ft at 5:00AM Dec 02, 2021Observed: 11.05 ft at 5:30AM Dec 02, 2021Observed: 11.04 ft at 6:15AM Dec 02, 2021Observed: 11.02 ft at 6:30AM Dec 02, 2021Observed: 11.01 ft at 6:45AM Dec 02, 2021Observed: 11.01 ft at 7:15AM Dec 02, 2021Observed: 10.98 ft at 7:30AM Dec 02, 2021Observed: 10.98 ft at 8:00AM Dec 02, 2021Observed: 10.97 ft at 8:15AM Dec 02, 2021Observed: 10.98 ft at 8:45AM Dec 02, 2021Observed: 10.95 ft at 9:00AM Dec 02, 2021Observed: 10.95 ft at 9:15AM Dec 02, 2021Observed: 10.94 ft at 9:30AM Dec 02, 2021Observed: 10.94 ft at 10:00AM Dec 02, 2021Observed: 10.93 ft at 10:15AM Dec 02, 2021Observed: 10.91 ft at 10:45AM Dec 02, 2021Observed: 10.91 ft at 11:00AM Dec 02, 2021Observed: 10.92 ft at 11:15AM Dec 02, 2021Observed: 10.89 ft at 11:30AM Dec 02, 2021Observed: 10.9 ft at 11:45AM Dec 02, 2021Observed: 10.9 ft at 12:00PM Dec 02, 2021Observed: 10.9 ft at 12:15PM Dec 02, 2021Observed: 10.89 ft at 12:45PM Dec 02, 2021Observed: 10.91 ft at 1:00PM Dec 02, 2021Observed: 10.88 ft at 1:30PM Dec 02, 2021Observed: 10.85 ft at 2:45PM Dec 02, 2021Observed: 10.87 ft at 3:15PM Dec 02, 2021Observed: 10.86 ft at 3:30PM Dec 02, 2021Observed: 10.85 ft at 3:45PM Dec 02, 2021Observed: 10.84 ft at 4:00PM Dec 02, 2021Observed: 10.82 ft at 4:15PM Dec 02, 2021Observed: 10.83 ft at 4:45PM Dec 02, 2021Observed: 10.82 ft at 5:00PM Dec 02, 2021Observed: 10.83 ft at 5:15PM Dec 02, 2021Observed: 10.82 ft at 5:30PM Dec 02, 2021Observed: 10.82 ft at 5:45PM Dec 02, 2021Observed: 10.84 ft at 6:00PM Dec 02, 2021Observed: 10.84 ft at 6:15PM Dec 02, 2021Observed: 10.83 ft at 6:30PM Dec 02, 2021Observed: 10.84 ft at 6:45PM Dec 02, 2021Observed: 10.83 ft at 7:00PM Dec 02, 2021Observed: 10.83 ft at 7:15PM Dec 02, 2021Observed: 10.83 ft at 7:30PM Dec 02, 2021Observed: 10.78 ft at 8:45PM Dec 02, 2021Observed: 10.78 ft at 9:30PM Dec 02, 2021Observed: 10.75 ft at 10:45PM Dec 02, 2021Observed: 10.77 ft at 11:00PM Dec 02, 2021Observed: 10.76 ft at 11:15PM Dec 02, 2021Observed: 10.74 ft at 11:30PM Dec 02, 2021Observed: 10.74 ft at 12:00AM Dec 03, 2021Observed: 10.74 ft at 12:15AM Dec 03, 2021Observed: 10.73 ft at 12:30AM Dec 03, 2021Observed: 10.7 ft at 4:45AM Dec 03, 2021Observed: 10.7 ft at 5:30AM Dec 03, 2021Observed: 10.68 ft at 5:45AM Dec 03, 2021Observed: 10.68 ft at 6:15AM Dec 03, 2021Observed: 10.68 ft at 6:30AM Dec 03, 2021Observed: 10.69 ft at 10:00AM Dec 03, 2021Observed: 10.69 ft at 10:15AM Dec 03, 2021Observed: 10.71 ft at 11:45AM Dec 03, 2021Observed: 10.72 ft at 12:00PM Dec 03, 2021Observed: 10.71 ft at 12:15PM Dec 03, 2021Observed: 10.7 ft at 12:45PM Dec 03, 2021Observed: 10.7 ft at 1:00PM Dec 03, 2021Observed: 10.71 ft at 1:30PM Dec 03, 2021Observed: 10.7 ft at 1:45PM Dec 03, 2021Observed: 10.7 ft at 2:00PM Dec 03, 2021Observed: 10.69 ft at 2:15PM Dec 03, 2021Observed: 10.69 ft at 2:30PM Dec 03, 2021Observed: 10.69 ft at 2:45PM Dec 03, 2021Observed: 10.68 ft at 3:15PM Dec 03, 2021Observed: 10.7 ft at 3:30PM Dec 03, 2021Observed: 10.67 ft at 4:15PM Dec 03, 2021Observed: 10.69 ft at 4:30PM Dec 03, 2021Observed: 10.68 ft at 4:45PM Dec 03, 2021Observed: 10.67 ft at 5:00PM Dec 03, 2021Observed: 10.67 ft at 5:15PM Dec 03, 2021Observed: 10.68 ft at 5:30PM Dec 03, 2021Observed: 10.7 ft at 6:00PM Dec 03, 2021Observed: 10.7 ft at 6:15PM Dec 03, 2021Observed: 10.72 ft at 7:45PM Dec 03, 2021Observed: 10.73 ft at 8:00PM Dec 03, 2021Observed: 10.74 ft at 8:15PM Dec 03, 2021Observed: 10.74 ft at 8:30PM Dec 03, 2021Observed: 10.75 ft at 8:45PM Dec 03, 2021Observed: 10.82 ft at 9:30PM Dec 03, 2021Observed: 10.84 ft at 9:45PM Dec 03, 2021Observed: 10.82 ft at 10:15PM Dec 03, 2021Observed: 10.8 ft at 10:30PM Dec 03, 2021Observed: 10.8 ft at 10:45PM Dec 03, 2021Observed: 10.82 ft at 11:00PM Dec 03, 2021Observed: 10.92 ft at 11:15PM Dec 03, 2021Observed: 11.24 ft at 11:30PM Dec 03, 2021Observed: 12.36 ft at 12:45AM Dec 04, 2021Observed: 12.4 ft at 1:00AM Dec 04, 2021Observed: 12.39 ft at 1:15AM Dec 04, 2021Observed: 12.39 ft at 1:30AM Dec 04, 2021Observed: 12.38 ft at 2:00AM Dec 04, 2021Observed: 12.4 ft at 2:15AM Dec 04, 2021Observed: 12.49 ft at 2:30AM Dec 04, 2021Observed: 12.6 ft at 2:45AM Dec 04, 2021Observed: 12.68 ft at 3:00AM Dec 04, 2021Observed: 12.8 ft at 3:15AM Dec 04, 2021Observed: 12.87 ft at 3:30AM Dec 04, 2021Observed: 12.94 ft at 3:45AM Dec 04, 2021Highest Observation: 12.99 ft at 4:00AM Dec 04, 2021Highest Observation: 12.99 ft at 4:15AM Dec 04, 2021Observed: 12.96 ft at 4:45AM Dec 04, 2021Observed: 12.88 ft at 5:30AM Dec 04, 2021Observed: 12.81 ft at 5:45AM Dec 04, 2021Observed: 12.71 ft at 6:15AM Dec 04, 2021Observed: 12.62 ft at 6:30AM Dec 04, 2021Observed: 12.62 ft at 6:45AM Dec 04, 2021Observed: 12.48 ft at 7:15AM Dec 04, 2021Observed: 12.41 ft at 7:30AM Dec 04, 2021Observed: 12.31 ft at 8:00AM Dec 04, 2021Observed: 12.26 ft at 8:15AM Dec 04, 2021Observed: 12.26 ft at 8:30AM Dec 04, 2021Observed: 12.22 ft at 8:45AM Dec 04, 2021Observed: 12.19 ft at 9:00AM Dec 04, 2021Observed: 12.13 ft at 9:15AM Dec 04, 2021Observed: 12.08 ft at 9:30AM Dec 04, 2021Observed: 12.05 ft at 9:45AM Dec 04, 2021Observed: 11.99 ft at 10:00AM Dec 04, 2021Observed: 11.96 ft at 10:15AM Dec 04, 2021Observed: 11.96 ft at 10:30AM Dec 04, 2021Observed: 11.91 ft at 10:45AM Dec 04, 2021Observed: 11.89 ft at 11:00AM Dec 04, 2021Observed: 11.88 ft at 11:15AM Dec 04, 2021Observed: 11.84 ft at 11:30AM Dec 04, 2021Observed: 11.83 ft at 11:45AM Dec 04, 2021Observed: 11.79 ft at 12:00PM Dec 04, 2021Observed: 11.78 ft at 12:15PM Dec 04, 2021Observed: 11.57 ft at 2:45PM Dec 04, 2021Observed: 11.55 ft at 3:00PM Dec 04, 2021Observed: 11.55 ft at 3:15PM Dec 04, 2021Observed: 11.53 ft at 3:30PM Dec 04, 2021Observed: 11.52 ft at 3:45PM Dec 04, 2021Observed: 11.5 ft at 4:00PM Dec 04, 2021Observed: 11.5 ft at 4:15PM Dec 04, 2021Observed: 11.5 ft at 4:30PM Dec 04, 2021Observed: 11.49 ft at 5:45PM Dec 04, 2021Observed: 11.52 ft at 6:00PM Dec 04, 2021Observed: 11.57 ft at 6:15PM Dec 04, 2021Observed: 11.68 ft at 6:45PM Dec 04, 2021Observed: 11.67 ft at 7:00PM Dec 04, 2021Observed: 11.61 ft at 7:15PM Dec 04, 2021Observed: 11.6 ft at 7:30PM Dec 04, 2021Observed: 11.57 ft at 7:45PM Dec 04, 2021Observed: 11.61 ft at 8:00PM Dec 04, 2021Observed: 11.72 ft at 8:15PM Dec 04, 2021USGS--Water Resources of the United StatesHORP4(plotting HGIRG) Graph Created (9:51PM Dec 4, 2021)ObservedLatest observed value: 11.72 ft at 8:15 PM AST 4-Dec-2021. Flood Stage is 20 ft
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About this graph
Tabular Data (UTC)
Tabular Data (AST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Rio Guanajibo near Hormigueros. Only observed stages are available for this point.
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Flood Categories (in feet)
Major Flood Stage: 26
Moderate Flood Stage: 22
Flood Stage: 20
Action Stage: 16
Low Stage (in feet): 0

Historic Crests
(1) 28.59 ft on 09/21/2017
(2) 28.59 ft on 09/20/2017
(3) 28.50 ft on 09/16/1975
(4) 28.03 ft on 09/22/1998
(5) 28.00 ft on 10/07/1985
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.85 ft on 10/27/2019 (P)
(2) 28.59 ft on 09/21/2017
(3) 28.59 ft on 09/20/2017
(4) 20.57 ft on 10/20/2014
(5) 20.84 ft on 10/27/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 17.64 ft on 10/07/1993

For more information on your flood risk go to www.floodsmart.gov.
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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
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21 At 21 feet...the river begins to affect area homes ... residential flooding expected.
20.3 Between 20 and 22 feet ... river is out of its banks and flooding CARR #114 and CARR #347.
19 Between 19.0 and 19.5 feet...Flooding along CARR #114 and CARR #309 in Hormigueros and Mayaguez.
About This Location Collapse

Latitude: 18.140694° N, Longitude: 67.148374° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 20 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 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 7.36 ft 27.36 ft  

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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