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San Juan Radar Outage Impacts Precipitation Estimates.. read more here
Hydrograph River at a Glance Download
Rio Grande De Arecibo near San Pedro Stage (ft)Flow (kcfs)Observed: 7.84 ft at 8:45PM May 12, 2024Observed: 7.83 ft at 9:00PM May 12, 2024Observed: 7.84 ft at 9:15PM May 12, 2024Observed: 7.82 ft at 9:30PM May 12, 2024Observed: 7.82 ft at 9:45PM May 12, 2024Observed: 7.83 ft at 10:00PM May 12, 2024Observed: 7.82 ft at 10:15PM May 12, 2024Observed: 7.82 ft at 10:30PM May 12, 2024Observed: 7.82 ft at 10:45PM May 12, 2024Observed: 7.82 ft at 11:00PM May 12, 2024Observed: 7.82 ft at 11:15PM May 12, 2024Observed: 7.82 ft at 11:30PM May 12, 2024Observed: 7.83 ft at 11:45PM May 12, 2024Observed: 7.81 ft at 12:00AM May 13, 2024Observed: 7.82 ft at 12:15AM May 13, 2024Observed: 7.81 ft at 12:30AM May 13, 2024Observed: 7.8 ft at 12:45AM May 13, 2024Observed: 7.81 ft at 1:00AM May 13, 2024Observed: 7.81 ft at 1:15AM May 13, 2024Observed: 7.81 ft at 1:30AM May 13, 2024Observed: 7.82 ft at 1:45AM May 13, 2024Observed: 7.82 ft at 2:00AM May 13, 2024Observed: 7.81 ft at 2:15AM May 13, 2024Observed: 7.81 ft at 2:30AM May 13, 2024Observed: 7.82 ft at 2:45AM May 13, 2024Observed: 7.79 ft at 3:00AM May 13, 2024Observed: 7.81 ft at 3:15AM May 13, 2024Observed: 7.81 ft at 3:30AM May 13, 2024Observed: 7.81 ft at 3:36AM May 13, 2024Observed: 7.81 ft at 3:45AM May 13, 2024Observed: 7.81 ft at 4:00AM May 13, 2024Observed: 7.81 ft at 4:15AM May 13, 2024Observed: 7.81 ft at 4:30AM May 13, 2024Observed: 7.81 ft at 4:45AM May 13, 2024Observed: 7.8 ft at 5:00AM May 13, 2024Observed: 7.81 ft at 5:15AM May 13, 2024Observed: 7.81 ft at 5:30AM May 13, 2024Observed: 7.81 ft at 5:45AM May 13, 2024Observed: 7.81 ft at 6:00AM May 13, 2024Observed: 7.82 ft at 6:15AM May 13, 2024Observed: 7.81 ft at 6:30AM May 13, 2024Observed: 7.8 ft at 6:45AM May 13, 2024Observed: 7.81 ft at 7:00AM May 13, 2024Observed: 7.8 ft at 7:15AM May 13, 2024Observed: 7.8 ft at 7:30AM May 13, 2024Observed: 7.82 ft at 7:45AM May 13, 2024Observed: 7.81 ft at 8:00AM May 13, 2024Observed: 7.81 ft at 8:15AM May 13, 2024Observed: 7.83 ft at 8:30AM May 13, 2024Observed: 7.83 ft at 8:45AM May 13, 2024Observed: 7.82 ft at 9:00AM May 13, 2024Observed: 7.84 ft at 9:15AM May 13, 2024Observed: 7.84 ft at 9:30AM May 13, 2024Observed: 7.84 ft at 9:45AM May 13, 2024Observed: 7.83 ft at 10:00AM May 13, 2024Observed: 7.83 ft at 10:15AM May 13, 2024Observed: 7.84 ft at 10:30AM May 13, 2024Highest Observation: 7.85 ft at 10:45AM May 13, 2024Observed: 7.83 ft at 11:00AM May 13, 2024Observed: 7.78 ft at 11:15AM May 13, 2024Observed: 7.72 ft at 11:30AM May 13, 2024Observed: 7.7 ft at 11:36AM May 13, 2024Observed: 7.67 ft at 11:45AM May 13, 2024Observed: 7.6 ft at 12:00PM May 13, 2024Observed: 7.48 ft at 12:15PM May 13, 2024Observed: 7.44 ft at 12:30PM May 13, 2024Observed: 7.4 ft at 12:45PM May 13, 2024Observed: 7.38 ft at 1:00PM May 13, 2024Observed: 7.34 ft at 1:15PM May 13, 2024Observed: 7.32 ft at 1:30PM May 13, 2024Observed: 7.31 ft at 1:45PM May 13, 2024Observed: 7.31 ft at 2:00PM May 13, 2024Observed: 7.32 ft at 2:15PM May 13, 2024Observed: 7.32 ft at 2:30PM May 13, 2024Observed: 7.29 ft at 2:45PM May 13, 2024Observed: 7.3 ft at 3:00PM May 13, 2024Observed: 7.3 ft at 3:15PM May 13, 2024Observed: 7.3 ft at 3:30PM May 13, 2024Observed: 7.29 ft at 3:45PM May 13, 2024Observed: 7.29 ft at 4:00PM May 13, 2024Observed: 7.3 ft at 4:15PM May 13, 2024Observed: 7.31 ft at 4:30PM May 13, 2024Observed: 7.31 ft at 4:45PM May 13, 2024Observed: 7.3 ft at 5:00PM May 13, 2024Observed: 7.31 ft at 5:15PM May 13, 2024Observed: 7.4 ft at 5:30PM May 13, 2024Observed: 7.49 ft at 5:45PM May 13, 2024Observed: 7.56 ft at 6:00PM May 13, 2024Observed: 7.66 ft at 6:15PM May 13, 2024Observed: 7.72 ft at 6:30PM May 13, 2024Observed: 7.76 ft at 6:45PM May 13, 2024Observed: 7.8 ft at 7:00PM May 13, 2024Observed: 7.82 ft at 7:15PM May 13, 2024Observed: 7.83 ft at 7:30PM May 13, 2024Observed: 7.83 ft at 7:41PM May 13, 2024Observed: 7.83 ft at 7:45PM May 13, 2024Observed: 7.84 ft at 8:00PM May 13, 2024Observed: 7.84 ft at 8:15PM May 13, 2024Observed: 7.83 ft at 8:30PM May 13, 2024Observed: 7.82 ft at 8:45PM May 13, 2024Observed: 7.82 ft at 9:00PM May 13, 2024Observed: 7.78 ft at 9:15PM May 13, 2024Observed: 7.72 ft at 9:30PM May 13, 2024Observed: 7.68 ft at 9:45PM May 13, 2024Observed: 7.61 ft at 10:00PM May 13, 2024Observed: 7.56 ft at 10:15PM May 13, 2024Observed: 7.48 ft at 10:30PM May 13, 2024Observed: 7.44 ft at 10:45PM May 13, 2024Observed: 7.4 ft at 11:00PM May 13, 2024Observed: 7.37 ft at 11:15PM May 13, 2024Observed: 7.34 ft at 11:30PM May 13, 2024Observed: 7.33 ft at 11:45PM May 13, 2024Observed: 7.32 ft at 12:00AM May 14, 2024Observed: 7.26 ft at 12:15AM May 14, 2024Observed: 7.22 ft at 12:30AM May 14, 2024Observed: 7.19 ft at 12:45AM May 14, 2024Observed: 7.15 ft at 1:00AM May 14, 2024Observed: 7.1 ft at 1:15AM May 14, 2024Observed: 7.06 ft at 1:30AM May 14, 2024Observed: 7.02 ft at 1:45AM May 14, 2024Observed: 6.99 ft at 2:00AM May 14, 2024Observed: 6.94 ft at 2:15AM May 14, 2024Observed: 6.93 ft at 2:30AM May 14, 2024Observed: 6.91 ft at 2:45AM May 14, 2024Observed: 6.86 ft at 3:00AM May 14, 2024Observed: 6.83 ft at 3:15AM May 14, 2024Observed: 6.83 ft at 3:30AM May 14, 2024Observed: 6.8 ft at 3:41AM May 14, 2024Observed: 6.81 ft at 3:45AM May 14, 2024Observed: 6.78 ft at 4:00AM May 14, 2024Observed: 6.76 ft at 4:15AM May 14, 2024Observed: 6.75 ft at 4:30AM May 14, 2024Observed: 6.74 ft at 4:45AM May 14, 2024Observed: 6.72 ft at 5:00AM May 14, 2024Observed: 6.73 ft at 5:15AM May 14, 2024Observed: 6.72 ft at 5:30AM May 14, 2024Observed: 6.7 ft at 5:45AM May 14, 2024Observed: 6.68 ft at 6:00AM May 14, 2024Observed: 6.7 ft at 6:15AM May 14, 2024Observed: 6.68 ft at 6:30AM May 14, 2024Observed: 6.67 ft at 6:45AM May 14, 2024Observed: 6.68 ft at 7:00AM May 14, 2024Observed: 6.67 ft at 7:15AM May 14, 2024Observed: 6.67 ft at 7:30AM May 14, 2024Observed: 6.66 ft at 7:45AM May 14, 2024Observed: 6.65 ft at 8:00AM May 14, 2024Observed: 6.64 ft at 8:15AM May 14, 2024Observed: 6.66 ft at 8:30AM May 14, 2024Observed: 6.66 ft at 8:45AM May 14, 2024Observed: 6.65 ft at 9:00AM May 14, 2024Observed: 6.67 ft at 9:15AM May 14, 2024Observed: 6.67 ft at 9:30AM May 14, 2024Observed: 6.68 ft at 9:45AM May 14, 2024Observed: 6.69 ft at 10:00AM May 14, 2024Observed: 6.76 ft at 10:15AM May 14, 2024Observed: 6.78 ft at 10:30AM May 14, 2024Observed: 6.91 ft at 10:45AM May 14, 2024Observed: 7.1 ft at 11:00AM May 14, 2024Observed: 7.29 ft at 11:15AM May 14, 2024Observed: 7.45 ft at 11:30AM May 14, 2024Observed: 7.5 ft at 11:41AM May 14, 2024Observed: 7.51 ft at 11:45AM May 14, 2024Observed: 7.55 ft at 12:00PM May 14, 2024Observed: 7.5 ft at 12:15PM May 14, 2024Observed: 7.52 ft at 12:30PM May 14, 2024Observed: 7.52 ft at 12:45PM May 14, 2024Observed: 7.51 ft at 1:00PM May 14, 2024Observed: 7.51 ft at 1:15PM May 14, 2024Observed: 7.49 ft at 1:30PM May 14, 2024Observed: 7.47 ft at 1:45PM May 14, 2024Observed: 7.48 ft at 2:00PM May 14, 2024Observed: 7.46 ft at 2:15PM May 14, 2024Observed: 7.48 ft at 2:30PM May 14, 2024Observed: 7.46 ft at 2:45PM May 14, 2024Observed: 7.46 ft at 3:00PM May 14, 2024Observed: 7.44 ft at 3:15PM May 14, 2024Observed: 7.45 ft at 3:30PM May 14, 2024Observed: 7.45 ft at 3:45PM May 14, 2024Observed: 7.44 ft at 4:00PM May 14, 2024Observed: 7.43 ft at 4:15PM May 14, 2024Observed: 7.44 ft at 4:30PM May 14, 2024Observed: 7.4 ft at 4:45PM May 14, 2024Observed: 7.4 ft at 5:00PM May 14, 2024Observed: 7.41 ft at 5:15PM May 14, 2024Observed: 7.39 ft at 5:30PM May 14, 2024Observed: 7.39 ft at 5:45PM May 14, 2024Observed: 7.4 ft at 6:00PM May 14, 2024Observed: 7.46 ft at 6:15PM May 14, 2024Observed: 7.51 ft at 6:30PM May 14, 2024Observed: 7.6 ft at 6:45PM May 14, 2024Observed: 7.68 ft at 7:00PM May 14, 2024Observed: 7.75 ft at 7:15PM May 14, 2024Observed: 7.77 ft at 7:30PM May 14, 2024Observed: 7.78 ft at 7:45PM May 14, 2024Observed: 7.78 ft at 7:47PM May 14, 2024Observed: 7.8 ft at 8:00PM May 14, 2024Observed: 7.79 ft at 8:15PM May 14, 2024Observed: 7.79 ft at 8:30PM May 14, 2024Observed: 7.79 ft at 8:45PM May 14, 2024Observed: 7.77 ft at 9:00PM May 14, 2024Observed: 7.77 ft at 9:15PM May 14, 2024Observed: 7.78 ft at 9:30PM May 14, 2024Observed: 7.77 ft at 9:45PM May 14, 2024Observed: 7.76 ft at 10:00PM May 14, 2024Observed: 7.77 ft at 10:15PM May 14, 2024Observed: 7.77 ft at 10:30PM May 14, 2024Observed: 7.76 ft at 10:45PM May 14, 2024Observed: 7.78 ft at 11:00PM May 14, 2024Observed: 7.76 ft at 11:15PM May 14, 2024Observed: 7.73 ft at 11:30PM May 14, 2024Observed: 7.66 ft at 11:45PM May 14, 2024Observed: 7.6 ft at 12:00AM May 15, 2024Observed: 7.51 ft at 12:15AM May 15, 2024Observed: 7.4 ft at 12:30AM May 15, 2024Observed: 7.33 ft at 12:45AM May 15, 2024Observed: 7.26 ft at 1:00AM May 15, 2024Observed: 7.19 ft at 1:15AM May 15, 2024Observed: 7.12 ft at 1:30AM May 15, 2024Observed: 7.06 ft at 1:45AM May 15, 2024Observed: 7.03 ft at 2:00AM May 15, 2024Observed: 6.99 ft at 2:15AM May 15, 2024Observed: 6.94 ft at 2:30AM May 15, 2024Observed: 6.91 ft at 2:45AM May 15, 2024Observed: 6.88 ft at 3:00AM May 15, 2024Observed: 6.86 ft at 3:15AM May 15, 2024Observed: 6.84 ft at 3:30AM May 15, 2024Observed: 6.83 ft at 3:45AM May 15, 2024Observed: 6.83 ft at 3:47AM May 15, 2024Observed: 6.8 ft at 4:00AM May 15, 2024Observed: 6.78 ft at 4:15AM May 15, 2024Observed: 6.77 ft at 4:30AM May 15, 2024Observed: 6.76 ft at 4:45AM May 15, 2024Observed: 6.76 ft at 5:00AM May 15, 2024Observed: 6.73 ft at 5:15AM May 15, 2024Observed: 6.73 ft at 5:30AM May 15, 2024Observed: 6.74 ft at 5:45AM May 15, 2024Observed: 6.73 ft at 6:00AM May 15, 2024Observed: 6.76 ft at 6:15AM May 15, 2024Observed: 6.75 ft at 6:30AM May 15, 2024Observed: 6.77 ft at 6:45AM May 15, 2024Observed: 6.79 ft at 7:00AM May 15, 2024Observed: 6.82 ft at 7:15AM May 15, 2024Observed: 6.86 ft at 7:30AM May 15, 2024Observed: 6.88 ft at 7:45AM May 15, 2024Observed: 6.93 ft at 8:00AM May 15, 2024Observed: 6.95 ft at 8:15AM May 15, 2024Observed: 6.98 ft at 8:30AM May 15, 2024Observed: 6.99 ft at 8:45AM May 15, 2024Observed: 7.03 ft at 9:00AM May 15, 2024Observed: 7.05 ft at 9:15AM May 15, 2024Observed: 7.07 ft at 9:30AM May 15, 2024Observed: 7.06 ft at 9:45AM May 15, 2024Observed: 7.07 ft at 10:00AM May 15, 2024Observed: 7.11 ft at 10:15AM May 15, 2024Observed: 7.13 ft at 10:30AM May 15, 2024Observed: 7.14 ft at 10:45AM May 15, 2024Observed: 7.17 ft at 11:00AM May 15, 2024Observed: 7.19 ft at 11:15AM May 15, 2024Observed: 7.27 ft at 11:30AM May 15, 2024Observed: 7.39 ft at 11:45AM May 15, 2024Observed: 7.39 ft at 11:46AM May 15, 2024Observed: 7.5 ft at 12:00PM May 15, 2024Observed: 7.5 ft at 12:15PM May 15, 2024Observed: 7.55 ft at 12:30PM May 15, 2024Observed: 7.56 ft at 12:45PM May 15, 2024Observed: 7.57 ft at 1:00PM May 15, 2024Observed: 7.58 ft at 1:15PM May 15, 2024Observed: 7.56 ft at 1:30PM May 15, 2024Observed: 7.57 ft at 1:45PM May 15, 2024Observed: 7.55 ft at 2:00PM May 15, 2024Observed: 7.54 ft at 2:15PM May 15, 2024Observed: 7.54 ft at 2:30PM May 15, 2024Observed: 7.52 ft at 2:45PM May 15, 2024Observed: 7.52 ft at 3:00PM May 15, 2024Observed: 7.5 ft at 3:15PM May 15, 2024Observed: 7.51 ft at 3:30PM May 15, 2024Observed: 7.48 ft at 3:45PM May 15, 2024Observed: 7.49 ft at 4:00PM May 15, 2024Observed: 7.45 ft at 4:15PM May 15, 2024Observed: 7.43 ft at 4:30PM May 15, 2024Observed: 7.45 ft at 4:45PM May 15, 2024Observed: 7.44 ft at 5:00PM May 15, 2024Observed: 7.44 ft at 5:15PM May 15, 2024Observed: 7.42 ft at 5:30PM May 15, 2024Observed: 7.42 ft at 5:45PM May 15, 2024Observed: 7.4 ft at 6:00PM May 15, 2024Observed: 7.41 ft at 6:15PM May 15, 2024Observed: 7.4 ft at 6:30PM May 15, 2024Observed: 7.4 ft at 6:45PM May 15, 2024Observed: 7.41 ft at 7:00PM May 15, 2024Observed: 7.4 ft at 7:15PM May 15, 2024Observed: 7.41 ft at 7:30PM May 15, 2024Observed: 7.39 ft at 7:47PM May 15, 2024USGS--Water Resources of the United StatesAREP4(plotting HGIRG) Graph Created (8:37PM May 15, 2024)ObservedLatest observed value: 7.39 ft at 7:47 PM AST 15-May-2024. Flood Stage is 14 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 Grande De Arecibo near San Pedro. Only observed stages are available for this point.
Return to Area Map
Upstream Gauge - at Arecibo Upstream Gauge
Flood Categories (in feet)
Major Flood Stage: 17
Moderate Flood Stage: 16
Flood Stage: 14
Action Stage: 10
Low Stage (in feet): -9999

Historic Crests
(1) 23.40 ft on 09/18/2022 (P)
(2) 21.96 ft on 09/20/2017 (P)
(3) 19.70 ft on 03/28/2012
(4) 18.53 ft on 10/08/2010
(5) 17.29 ft on 09/03/2008
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 14.92 ft on 11/06/2022 (P)
(2) 23.40 ft on 09/18/2022 (P)
(3) 13.20 ft on 07/31/2020 (P)
(4) 21.96 ft on 09/20/2017 (P)
(5) 15.36 ft on 08/24/2014
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 8.22 ft on 09/23/2001
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
14 River out of its banks with flooding in Barrios Magallanes, Cristobal Colon, and La Puntilla.River out of its banks in the Municipality of Arecibo with flooding on Road #123 ... km 61.6.
About This Location Collapse

Latitude: 18.396823° N, Longitude: 66.691177° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 14 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 49 63 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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