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FloodSmart
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ALERT: December 5th update on the status of the nationwide data transmission error preventing stream gauge data collected at affected locations from being displayed on the Advanced Hydrologic Prediction Services (AHPS) webpages. As of 11/08/2018, The USGS has restored all impacted operational stream gauges to transmitting status. The status map of gauge outages from other agencies is here. The outage map will be updated each Thursday. We apologize for the service interruption and hope to have the data restored as soon as possible.



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: 12.54 ft at 10:30PM Dec 08, 2018Observed: 12.54 ft at 10:45PM Dec 08, 2018Observed: 12.54 ft at 11:00PM Dec 08, 2018Observed: 12.53 ft at 11:15PM Dec 08, 2018Observed: 12.53 ft at 11:30PM Dec 08, 2018Observed: 12.53 ft at 11:45PM Dec 08, 2018Observed: 12.52 ft at 12:00AM Dec 09, 2018Observed: 12.52 ft at 12:15AM Dec 09, 2018Observed: 12.52 ft at 12:30AM Dec 09, 2018Observed: 12.52 ft at 12:45AM Dec 09, 2018Observed: 12.52 ft at 1:00AM Dec 09, 2018Observed: 12.52 ft at 1:15AM Dec 09, 2018Observed: 12.51 ft at 1:30AM Dec 09, 2018Observed: 12.51 ft at 1:45AM Dec 09, 2018Observed: 12.51 ft at 2:00AM Dec 09, 2018Observed: 12.51 ft at 2:15AM Dec 09, 2018Observed: 12.51 ft at 2:30AM Dec 09, 2018Observed: 12.51 ft at 2:45AM Dec 09, 2018Observed: 12.51 ft at 3:00AM Dec 09, 2018Observed: 12.52 ft at 3:15AM Dec 09, 2018Observed: 12.53 ft at 3:30AM Dec 09, 2018Observed: 12.53 ft at 3:45AM Dec 09, 2018Observed: 12.54 ft at 4:00AM Dec 09, 2018Observed: 12.55 ft at 4:15AM Dec 09, 2018Observed: 12.56 ft at 4:30AM Dec 09, 2018Observed: 12.57 ft at 4:45AM Dec 09, 2018Observed: 12.58 ft at 5:00AM Dec 09, 2018Observed: 12.59 ft at 5:15AM Dec 09, 2018Observed: 12.6 ft at 5:30AM Dec 09, 2018Observed: 12.61 ft at 5:45AM Dec 09, 2018Observed: 12.62 ft at 6:00AM Dec 09, 2018Highest Observation: 12.63 ft at 6:15AM Dec 09, 2018Highest Observation: 12.63 ft at 6:30AM Dec 09, 2018Highest Observation: 12.63 ft at 6:45AM Dec 09, 2018Highest Observation: 12.63 ft at 7:00AM Dec 09, 2018Highest Observation: 12.63 ft at 7:15AM Dec 09, 2018Observed: 12.62 ft at 7:30AM Dec 09, 2018Observed: 12.62 ft at 7:45AM Dec 09, 2018Observed: 12.61 ft at 8:00AM Dec 09, 2018Observed: 12.6 ft at 8:15AM Dec 09, 2018Observed: 12.59 ft at 8:30AM Dec 09, 2018Observed: 12.58 ft at 8:45AM Dec 09, 2018Observed: 12.57 ft at 9:00AM Dec 09, 2018Observed: 12.56 ft at 9:15AM Dec 09, 2018Observed: 12.55 ft at 9:30AM Dec 09, 2018Observed: 12.55 ft at 9:45AM Dec 09, 2018Observed: 12.54 ft at 10:00AM Dec 09, 2018Observed: 12.53 ft at 10:15AM Dec 09, 2018Observed: 12.52 ft at 10:30AM Dec 09, 2018Observed: 12.51 ft at 10:45AM Dec 09, 2018Observed: 12.5 ft at 11:00AM Dec 09, 2018Observed: 12.49 ft at 11:15AM Dec 09, 2018Observed: 12.49 ft at 11:30AM Dec 09, 2018Observed: 12.49 ft at 11:45AM Dec 09, 2018Observed: 12.48 ft at 12:00PM Dec 09, 2018Observed: 12.48 ft at 12:15PM Dec 09, 2018Observed: 12.47 ft at 12:30PM Dec 09, 2018Observed: 12.47 ft at 12:45PM Dec 09, 2018Observed: 12.46 ft at 1:00PM Dec 09, 2018Observed: 12.46 ft at 1:15PM Dec 09, 2018Observed: 12.46 ft at 1:30PM Dec 09, 2018Observed: 12.45 ft at 1:45PM Dec 09, 2018Observed: 12.45 ft at 2:00PM Dec 09, 2018Observed: 12.45 ft at 2:15PM Dec 09, 2018Observed: 12.44 ft at 2:30PM Dec 09, 2018Observed: 12.44 ft at 2:45PM Dec 09, 2018Observed: 12.44 ft at 3:00PM Dec 09, 2018Observed: 12.44 ft at 3:15PM Dec 09, 2018Observed: 12.43 ft at 3:30PM Dec 09, 2018Observed: 12.43 ft at 3:45PM Dec 09, 2018Observed: 12.43 ft at 4:00PM Dec 09, 2018Observed: 12.43 ft at 4:15PM Dec 09, 2018Observed: 12.43 ft at 4:30PM Dec 09, 2018Observed: 12.43 ft at 4:45PM Dec 09, 2018Observed: 12.43 ft at 5:00PM Dec 09, 2018Observed: 12.42 ft at 5:15PM Dec 09, 2018Observed: 12.42 ft at 5:30PM Dec 09, 2018Observed: 12.42 ft at 5:45PM Dec 09, 2018Observed: 12.42 ft at 6:00PM Dec 09, 2018Observed: 12.42 ft at 6:15PM Dec 09, 2018Observed: 12.42 ft at 6:30PM Dec 09, 2018Observed: 12.42 ft at 6:45PM Dec 09, 2018Observed: 12.41 ft at 7:00PM Dec 09, 2018Observed: 12.41 ft at 7:15PM Dec 09, 2018Observed: 12.41 ft at 7:30PM Dec 09, 2018Observed: 12.4 ft at 7:45PM Dec 09, 2018Observed: 12.4 ft at 8:00PM Dec 09, 2018Observed: 12.4 ft at 8:15PM Dec 09, 2018Observed: 12.4 ft at 8:30PM Dec 09, 2018Observed: 12.4 ft at 8:45PM Dec 09, 2018Observed: 12.4 ft at 9:00PM Dec 09, 2018Observed: 12.4 ft at 9:15PM Dec 09, 2018Observed: 12.39 ft at 9:30PM Dec 09, 2018Observed: 12.39 ft at 9:45PM Dec 09, 2018Observed: 12.39 ft at 10:00PM Dec 09, 2018Observed: 12.39 ft at 10:15PM Dec 09, 2018Observed: 12.39 ft at 10:30PM Dec 09, 2018Observed: 12.38 ft at 10:45PM Dec 09, 2018Observed: 12.38 ft at 11:00PM Dec 09, 2018Observed: 12.38 ft at 11:15PM Dec 09, 2018Observed: 12.38 ft at 11:30PM Dec 09, 2018Observed: 12.37 ft at 11:45PM Dec 09, 2018Observed: 12.37 ft at 12:00AM Dec 10, 2018Observed: 12.37 ft at 12:15AM Dec 10, 2018Observed: 12.37 ft at 12:30AM Dec 10, 2018Observed: 12.37 ft at 12:45AM Dec 10, 2018Observed: 12.36 ft at 1:00AM Dec 10, 2018Observed: 12.36 ft at 1:15AM Dec 10, 2018Observed: 12.36 ft at 1:30AM Dec 10, 2018Observed: 12.35 ft at 1:45AM Dec 10, 2018Observed: 12.35 ft at 2:00AM Dec 10, 2018Observed: 12.35 ft at 2:15AM Dec 10, 2018Observed: 12.35 ft at 2:30AM Dec 10, 2018Observed: 12.35 ft at 2:45AM Dec 10, 2018Observed: 12.35 ft at 3:00AM Dec 10, 2018Observed: 12.35 ft at 3:15AM Dec 10, 2018Observed: 12.35 ft at 3:30AM Dec 10, 2018Observed: 12.34 ft at 3:45AM Dec 10, 2018Observed: 12.34 ft at 4:00AM Dec 10, 2018Observed: 12.34 ft at 4:15AM Dec 10, 2018Observed: 12.34 ft at 4:30AM Dec 10, 2018Observed: 12.33 ft at 4:45AM Dec 10, 2018Observed: 12.34 ft at 5:00AM Dec 10, 2018Observed: 12.34 ft at 5:15AM Dec 10, 2018Observed: 12.33 ft at 5:30AM Dec 10, 2018Observed: 12.33 ft at 5:45AM Dec 10, 2018Observed: 12.33 ft at 6:00AM Dec 10, 2018Observed: 12.33 ft at 6:15AM Dec 10, 2018Observed: 12.33 ft at 6:30AM Dec 10, 2018Observed: 12.33 ft at 6:45AM Dec 10, 2018Observed: 12.33 ft at 7:00AM Dec 10, 2018Observed: 12.33 ft at 7:15AM Dec 10, 2018Observed: 12.33 ft at 7:30AM Dec 10, 2018Observed: 12.33 ft at 7:45AM Dec 10, 2018Observed: 12.33 ft at 8:00AM Dec 10, 2018Observed: 12.35 ft at 8:15AM Dec 10, 2018Observed: 12.35 ft at 8:30AM Dec 10, 2018Observed: 12.34 ft at 8:45AM Dec 10, 2018Observed: 12.33 ft at 9:00AM Dec 10, 2018Observed: 12.32 ft at 9:15AM Dec 10, 2018Observed: 12.32 ft at 9:30AM Dec 10, 2018Observed: 12.32 ft at 9:45AM Dec 10, 2018Observed: 12.32 ft at 10:00AM Dec 10, 2018Observed: 12.32 ft at 10:15AM Dec 10, 2018Observed: 12.32 ft at 10:30AM Dec 10, 2018Observed: 12.32 ft at 10:45AM Dec 10, 2018Observed: 12.32 ft at 11:00AM Dec 10, 2018Observed: 12.32 ft at 11:15AM Dec 10, 2018Observed: 12.32 ft at 11:30AM Dec 10, 2018Observed: 12.31 ft at 11:45AM Dec 10, 2018Observed: 12.31 ft at 12:00PM Dec 10, 2018Observed: 12.31 ft at 12:15PM Dec 10, 2018Observed: 12.31 ft at 12:30PM Dec 10, 2018Observed: 12.3 ft at 12:45PM Dec 10, 2018Observed: 12.31 ft at 1:00PM Dec 10, 2018Observed: 12.3 ft at 1:15PM Dec 10, 2018Observed: 12.31 ft at 1:30PM Dec 10, 2018Observed: 12.31 ft at 1:45PM Dec 10, 2018Observed: 12.31 ft at 2:00PM Dec 10, 2018Observed: 12.31 ft at 2:15PM Dec 10, 2018Observed: 12.31 ft at 2:30PM Dec 10, 2018Observed: 12.31 ft at 2:45PM Dec 10, 2018Observed: 12.31 ft at 3:00PM Dec 10, 2018Observed: 12.31 ft at 3:15PM Dec 10, 2018Observed: 12.32 ft at 3:30PM Dec 10, 2018Observed: 12.31 ft at 3:45PM Dec 10, 2018Observed: 12.31 ft at 4:00PM Dec 10, 2018Observed: 12.31 ft at 4:15PM Dec 10, 2018Observed: 12.31 ft at 4:30PM Dec 10, 2018Observed: 12.31 ft at 4:45PM Dec 10, 2018Observed: 12.31 ft at 5:00PM Dec 10, 2018Observed: 12.31 ft at 5:15PM Dec 10, 2018Observed: 12.31 ft at 5:30PM Dec 10, 2018Observed: 12.31 ft at 5:45PM Dec 10, 2018Observed: 12.31 ft at 6:00PM Dec 10, 2018Observed: 12.31 ft at 6:15PM Dec 10, 2018Observed: 12.3 ft at 6:30PM Dec 10, 2018Observed: 12.3 ft at 6:45PM Dec 10, 2018Observed: 12.3 ft at 7:00PM Dec 10, 2018Observed: 12.3 ft at 7:15PM Dec 10, 2018Observed: 12.3 ft at 7:30PM Dec 10, 2018Observed: 12.3 ft at 7:45PM Dec 10, 2018Observed: 12.29 ft at 8:00PM Dec 10, 2018Observed: 12.29 ft at 8:15PM Dec 10, 2018Observed: 12.29 ft at 8:30PM Dec 10, 2018Observed: 12.29 ft at 8:45PM Dec 10, 2018Observed: 12.3 ft at 9:00PM Dec 10, 2018Observed: 12.29 ft at 9:15PM Dec 10, 2018Observed: 12.29 ft at 9:30PM Dec 10, 2018Observed: 12.29 ft at 9:45PM Dec 10, 2018Observed: 12.29 ft at 10:00PM Dec 10, 2018Observed: 12.28 ft at 10:15PM Dec 10, 2018Observed: 12.28 ft at 10:30PM Dec 10, 2018Observed: 12.28 ft at 10:45PM Dec 10, 2018Observed: 12.28 ft at 11:00PM Dec 10, 2018Observed: 12.28 ft at 11:15PM Dec 10, 2018Observed: 12.28 ft at 11:30PM Dec 10, 2018Observed: 12.28 ft at 11:45PM Dec 10, 2018Observed: 12.28 ft at 12:00AM Dec 11, 2018Observed: 12.28 ft at 12:15AM Dec 11, 2018Observed: 12.28 ft at 12:30AM Dec 11, 2018Observed: 12.28 ft at 12:45AM Dec 11, 2018Observed: 12.27 ft at 1:00AM Dec 11, 2018Observed: 12.27 ft at 1:15AM Dec 11, 2018Observed: 12.27 ft at 1:30AM Dec 11, 2018Observed: 12.27 ft at 1:45AM Dec 11, 2018Observed: 12.27 ft at 2:00AM Dec 11, 2018Observed: 12.27 ft at 2:15AM Dec 11, 2018Observed: 12.27 ft at 2:30AM Dec 11, 2018Observed: 12.27 ft at 2:45AM Dec 11, 2018Observed: 12.27 ft at 3:00AM Dec 11, 2018Observed: 12.27 ft at 3:15AM Dec 11, 2018Observed: 12.27 ft at 3:30AM Dec 11, 2018Observed: 12.27 ft at 3:45AM Dec 11, 2018Observed: 12.27 ft at 4:00AM Dec 11, 2018Observed: 12.27 ft at 4:15AM Dec 11, 2018Observed: 12.27 ft at 4:30AM Dec 11, 2018Observed: 12.27 ft at 4:45AM Dec 11, 2018Observed: 12.27 ft at 5:00AM Dec 11, 2018Observed: 12.27 ft at 5:15AM Dec 11, 2018Observed: 12.27 ft at 5:30AM Dec 11, 2018Observed: 12.26 ft at 5:45AM Dec 11, 2018Observed: 12.26 ft at 6:00AM Dec 11, 2018Observed: 12.26 ft at 6:15AM Dec 11, 2018Observed: 12.26 ft at 6:30AM Dec 11, 2018Observed: 12.26 ft at 6:45AM Dec 11, 2018Observed: 12.26 ft at 7:00AM Dec 11, 2018Observed: 12.26 ft at 7:15AM Dec 11, 2018Observed: 12.26 ft at 7:30AM Dec 11, 2018Observed: 12.26 ft at 7:45AM Dec 11, 2018Observed: 12.26 ft at 8:00AM Dec 11, 2018Observed: 12.26 ft at 8:15AM Dec 11, 2018Observed: 12.26 ft at 8:30AM Dec 11, 2018Observed: 12.27 ft at 8:45AM Dec 11, 2018Observed: 12.26 ft at 9:00AM Dec 11, 2018Observed: 12.26 ft at 9:15AM Dec 11, 2018Observed: 12.26 ft at 9:30AM Dec 11, 2018Observed: 12.26 ft at 9:45AM Dec 11, 2018Observed: 12.26 ft at 10:00AM Dec 11, 2018Observed: 12.26 ft at 10:15AM Dec 11, 2018Observed: 12.26 ft at 10:30AM Dec 11, 2018Observed: 12.26 ft at 10:45AM Dec 11, 2018Observed: 12.26 ft at 11:00AM Dec 11, 2018Observed: 12.26 ft at 11:15AM Dec 11, 2018Observed: 12.26 ft at 11:30AM Dec 11, 2018Observed: 12.26 ft at 11:45AM Dec 11, 2018Observed: 12.26 ft at 12:00PM Dec 11, 2018Observed: 12.26 ft at 12:15PM Dec 11, 2018Observed: 12.25 ft at 12:30PM Dec 11, 2018Observed: 12.25 ft at 12:45PM Dec 11, 2018Observed: 12.25 ft at 1:00PM Dec 11, 2018Observed: 12.25 ft at 1:15PM Dec 11, 2018Observed: 12.24 ft at 1:30PM Dec 11, 2018Observed: 12.23 ft at 1:45PM Dec 11, 2018Observed: 12.25 ft at 2:00PM Dec 11, 2018Observed: 12.25 ft at 2:15PM Dec 11, 2018Observed: 12.25 ft at 2:30PM Dec 11, 2018Observed: 12.26 ft at 2:45PM Dec 11, 2018Observed: 12.25 ft at 3:00PM Dec 11, 2018Observed: 12.26 ft at 3:15PM Dec 11, 2018Observed: 12.26 ft at 3:30PM Dec 11, 2018Observed: 12.26 ft at 3:45PM Dec 11, 2018Observed: 12.26 ft at 4:00PM Dec 11, 2018Observed: 12.26 ft at 4:15PM Dec 11, 2018Observed: 12.26 ft at 4:30PM Dec 11, 2018Observed: 12.26 ft at 4:45PM Dec 11, 2018Observed: 12.26 ft at 5:00PM Dec 11, 2018Observed: 12.26 ft at 5:15PM Dec 11, 2018Observed: 12.26 ft at 5:30PM Dec 11, 2018Observed: 12.26 ft at 5:45PM Dec 11, 2018Observed: 12.26 ft at 6:00PM Dec 11, 2018Observed: 12.26 ft at 6:15PM Dec 11, 2018Observed: 12.26 ft at 6:30PM Dec 11, 2018Observed: 12.26 ft at 6:45PM Dec 11, 2018Observed: 12.26 ft at 7:00PM Dec 11, 2018Observed: 12.26 ft at 7:15PM Dec 11, 2018Observed: 12.26 ft at 7:30PM Dec 11, 2018Observed: 12.26 ft at 7:45PM Dec 11, 2018Observed: 12.26 ft at 8:00PM Dec 11, 2018Observed: 12.26 ft at 8:15PM Dec 11, 2018Observed: 12.25 ft at 8:30PM Dec 11, 2018Observed: 12.25 ft at 8:45PM Dec 11, 2018Observed: 12.25 ft at 9:00PM Dec 11, 2018Observed: 12.25 ft at 9:15PM Dec 11, 2018Observed: 12.25 ft at 9:30PM Dec 11, 2018USGS--Water Resources of the United StatesHORP4(plotting HGIRG) Graph Created (10:20PM Dec 11, 2018)ObservedLatest observed value: 12.25 ft at 9:30 PM AST 11-Dec-2018. Flood Stage is 20 ft
Printable Image
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.
Return to Area Map
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) 28.50 ft on 09/16/1975
(2) 28.50 ft on 09/20/2017 (P)
(3) 28.03 ft on 09/22/1998
(4) 28.00 ft on 10/07/1985
(5) 27.11 ft on 08/25/1988
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 28.50 ft on 09/20/2017 (P)
(2) 20.57 ft on 10/20/2014
(3) 20.84 ft on 10/27/2011
(4) 24.87 ft on 10/08/2010
(5) 20.37 ft on 10/22/2009
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 0.00 ft on 06/18/1977

For more information on your flood risk go to www.floodsmart.gov.
Zoom Level:15
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
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: 18.143333° N, Longitude: 67.149167° 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:
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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