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San Juan Radar Outage Impacts Precipitation Estimates.. read more here
Hydrograph River at a Glance Download
Rio Grande De Manati near Ciales Stage (ft)Flow (kcfs)Observed: 1.39 ft at 8:15PM May 19, 2022Observed: 1.37 ft at 8:30PM May 19, 2022Observed: 1.38 ft at 8:45PM May 19, 2022Observed: 1.38 ft at 9:00PM May 19, 2022Observed: 1.38 ft at 9:15PM May 19, 2022Observed: 1.38 ft at 9:30PM May 19, 2022Observed: 1.38 ft at 9:45PM May 19, 2022Observed: 1.39 ft at 10:00PM May 19, 2022Observed: 1.39 ft at 10:15PM May 19, 2022Observed: 1.37 ft at 10:30PM May 19, 2022Observed: 1.4 ft at 10:45PM May 19, 2022Observed: 1.38 ft at 11:00PM May 19, 2022Observed: 1.37 ft at 11:15PM May 19, 2022Observed: 1.38 ft at 11:30PM May 19, 2022Observed: 1.38 ft at 11:45PM May 19, 2022Observed: 1.38 ft at 12:00AM May 20, 2022Observed: 1.38 ft at 12:15AM May 20, 2022Observed: 1.37 ft at 12:30AM May 20, 2022Observed: 1.38 ft at 12:45AM May 20, 2022Observed: 1.38 ft at 12:56AM May 20, 2022Observed: 1.38 ft at 1:00AM May 20, 2022Observed: 1.38 ft at 1:15AM May 20, 2022Observed: 1.37 ft at 1:30AM May 20, 2022Observed: 1.37 ft at 1:45AM May 20, 2022Observed: 1.38 ft at 2:00AM May 20, 2022Observed: 1.39 ft at 2:15AM May 20, 2022Observed: 1.38 ft at 2:30AM May 20, 2022Observed: 1.38 ft at 2:45AM May 20, 2022Observed: 1.38 ft at 3:00AM May 20, 2022Observed: 1.39 ft at 3:15AM May 20, 2022Observed: 1.38 ft at 3:30AM May 20, 2022Observed: 1.38 ft at 3:45AM May 20, 2022Observed: 1.38 ft at 4:00AM May 20, 2022Observed: 1.39 ft at 4:15AM May 20, 2022Observed: 1.38 ft at 4:30AM May 20, 2022Observed: 1.38 ft at 4:45AM May 20, 2022Observed: 1.37 ft at 5:00AM May 20, 2022Observed: 1.38 ft at 5:15AM May 20, 2022Observed: 1.39 ft at 5:30AM May 20, 2022Observed: 1.38 ft at 5:45AM May 20, 2022Observed: 1.37 ft at 6:00AM May 20, 2022Observed: 1.4 ft at 6:15AM May 20, 2022Observed: 1.38 ft at 6:30AM May 20, 2022Observed: 1.38 ft at 6:45AM May 20, 2022Observed: 1.38 ft at 7:00AM May 20, 2022Observed: 1.39 ft at 7:15AM May 20, 2022Observed: 1.39 ft at 7:30AM May 20, 2022Observed: 1.39 ft at 7:45AM May 20, 2022Observed: 1.38 ft at 8:00AM May 20, 2022Observed: 1.39 ft at 8:15AM May 20, 2022Observed: 1.38 ft at 8:30AM May 20, 2022Observed: 1.38 ft at 9:45AM May 20, 2022Observed: 1.38 ft at 10:00AM May 20, 2022Observed: 1.38 ft at 10:15AM May 20, 2022Observed: 1.38 ft at 10:30AM May 20, 2022Observed: 1.38 ft at 10:45AM May 20, 2022Observed: 1.38 ft at 11:00AM May 20, 2022Observed: 1.38 ft at 11:15AM May 20, 2022Observed: 1.4 ft at 11:30AM May 20, 2022Observed: 1.38 ft at 11:45AM May 20, 2022Observed: 1.38 ft at 12:00PM May 20, 2022Observed: 1.38 ft at 12:15PM May 20, 2022Observed: 1.37 ft at 12:30PM May 20, 2022Observed: 1.39 ft at 12:45PM May 20, 2022Observed: 1.38 ft at 1:00PM May 20, 2022Observed: 1.38 ft at 1:15PM May 20, 2022Observed: 1.37 ft at 1:30PM May 20, 2022Observed: 1.38 ft at 1:45PM May 20, 2022Observed: 1.38 ft at 2:00PM May 20, 2022Observed: 1.37 ft at 2:15PM May 20, 2022Observed: 1.38 ft at 2:30PM May 20, 2022Observed: 1.38 ft at 2:45PM May 20, 2022Observed: 1.37 ft at 3:00PM May 20, 2022Observed: 1.37 ft at 3:15PM May 20, 2022Observed: 1.37 ft at 3:30PM May 20, 2022Observed: 1.37 ft at 3:45PM May 20, 2022Observed: 1.38 ft at 4:00PM May 20, 2022Observed: 1.38 ft at 4:15PM May 20, 2022Observed: 1.38 ft at 4:30PM May 20, 2022Observed: 1.36 ft at 4:45PM May 20, 2022Observed: 1.37 ft at 4:56PM May 20, 2022Observed: 1.36 ft at 5:00PM May 20, 2022Observed: 1.36 ft at 5:15PM May 20, 2022Observed: 1.36 ft at 5:30PM May 20, 2022Observed: 1.36 ft at 6:45PM May 20, 2022Observed: 1.36 ft at 7:00PM May 20, 2022Observed: 1.36 ft at 7:15PM May 20, 2022Observed: 1.37 ft at 7:30PM May 20, 2022Observed: 1.36 ft at 7:45PM May 20, 2022Observed: 1.37 ft at 8:00PM May 20, 2022Observed: 1.36 ft at 8:15PM May 20, 2022Observed: 1.36 ft at 8:30PM May 20, 2022Observed: 1.36 ft at 8:45PM May 20, 2022Observed: 1.37 ft at 9:00PM May 20, 2022Observed: 1.36 ft at 9:15PM May 20, 2022Observed: 1.36 ft at 9:30PM May 20, 2022Observed: 1.36 ft at 11:45PM May 20, 2022Observed: 1.36 ft at 12:00AM May 21, 2022Observed: 1.35 ft at 12:15AM May 21, 2022Observed: 1.36 ft at 12:30AM May 21, 2022Observed: 1.36 ft at 12:45AM May 21, 2022Observed: 1.36 ft at 1:00AM May 21, 2022Observed: 1.35 ft at 1:15AM May 21, 2022Observed: 1.37 ft at 1:30AM May 21, 2022Observed: 1.36 ft at 2:45AM May 21, 2022Observed: 1.37 ft at 3:00AM May 21, 2022Observed: 1.36 ft at 3:15AM May 21, 2022Observed: 1.36 ft at 3:30AM May 21, 2022Observed: 1.36 ft at 3:45AM May 21, 2022Observed: 1.37 ft at 4:00AM May 21, 2022Observed: 1.36 ft at 4:15AM May 21, 2022Observed: 1.36 ft at 4:30AM May 21, 2022Observed: 1.35 ft at 4:45AM May 21, 2022Observed: 1.37 ft at 5:00AM May 21, 2022Observed: 1.36 ft at 5:15AM May 21, 2022Observed: 1.37 ft at 5:30AM May 21, 2022Observed: 1.36 ft at 5:45AM May 21, 2022Observed: 1.37 ft at 6:00AM May 21, 2022Observed: 1.37 ft at 6:15AM May 21, 2022Observed: 1.37 ft at 6:30AM May 21, 2022Observed: 1.37 ft at 6:45AM May 21, 2022Observed: 1.37 ft at 7:00AM May 21, 2022Observed: 1.36 ft at 7:15AM May 21, 2022Observed: 1.37 ft at 7:30AM May 21, 2022Observed: 1.36 ft at 7:45AM May 21, 2022Observed: 1.36 ft at 8:00AM May 21, 2022Observed: 1.37 ft at 8:15AM May 21, 2022Observed: 1.37 ft at 8:30AM May 21, 2022Observed: 1.37 ft at 8:45AM May 21, 2022Observed: 1.37 ft at 9:00AM May 21, 2022Observed: 1.37 ft at 9:01AM May 21, 2022Observed: 1.37 ft at 9:15AM May 21, 2022Observed: 1.37 ft at 9:30AM May 21, 2022Observed: 1.37 ft at 9:45AM May 21, 2022Observed: 1.38 ft at 10:00AM May 21, 2022Observed: 1.37 ft at 10:15AM May 21, 2022Observed: 1.37 ft at 10:30AM May 21, 2022Observed: 1.37 ft at 10:45AM May 21, 2022Observed: 1.37 ft at 11:00AM May 21, 2022Observed: 1.38 ft at 11:15AM May 21, 2022Observed: 1.37 ft at 11:30AM May 21, 2022Observed: 1.38 ft at 11:45AM May 21, 2022Observed: 1.38 ft at 12:00PM May 21, 2022Observed: 1.38 ft at 12:15PM May 21, 2022Observed: 1.37 ft at 12:30PM May 21, 2022Observed: 1.39 ft at 12:45PM May 21, 2022Observed: 1.39 ft at 1:00PM May 21, 2022Observed: 1.39 ft at 1:15PM May 21, 2022Observed: 1.39 ft at 1:30PM May 21, 2022Observed: 1.39 ft at 1:45PM May 21, 2022Observed: 1.38 ft at 2:00PM May 21, 2022Observed: 1.38 ft at 2:15PM May 21, 2022Observed: 1.38 ft at 2:30PM May 21, 2022Observed: 1.38 ft at 2:45PM May 21, 2022Observed: 1.39 ft at 3:00PM May 21, 2022Observed: 1.39 ft at 3:15PM May 21, 2022Observed: 1.39 ft at 3:30PM May 21, 2022Observed: 1.39 ft at 3:45PM May 21, 2022Observed: 1.4 ft at 4:00PM May 21, 2022Observed: 1.39 ft at 4:15PM May 21, 2022Observed: 1.39 ft at 4:30PM May 21, 2022Observed: 1.39 ft at 4:45PM May 21, 2022Observed: 1.39 ft at 4:56PM May 21, 2022Observed: 1.4 ft at 5:00PM May 21, 2022Observed: 1.4 ft at 5:01PM May 21, 2022Observed: 1.38 ft at 5:15PM May 21, 2022Observed: 1.39 ft at 5:30PM May 21, 2022Observed: 1.38 ft at 6:45PM May 21, 2022Observed: 1.39 ft at 7:00PM May 21, 2022Observed: 1.38 ft at 7:15PM May 21, 2022Observed: 1.38 ft at 7:30PM May 21, 2022Observed: 1.38 ft at 7:45PM May 21, 2022Observed: 1.38 ft at 8:00PM May 21, 2022Observed: 1.38 ft at 8:15PM May 21, 2022Observed: 1.37 ft at 8:30PM May 21, 2022Observed: 1.38 ft at 8:45PM May 21, 2022Observed: 1.39 ft at 9:00PM May 21, 2022Observed: 1.38 ft at 9:15PM May 21, 2022Observed: 1.37 ft at 9:30PM May 21, 2022Observed: 1.36 ft at 9:45PM May 21, 2022Observed: 1.36 ft at 10:00PM May 21, 2022Observed: 1.37 ft at 10:15PM May 21, 2022Observed: 1.36 ft at 10:30PM May 21, 2022Observed: 1.36 ft at 10:45PM May 21, 2022Observed: 1.36 ft at 11:00PM May 21, 2022Observed: 1.36 ft at 11:15PM May 21, 2022Observed: 1.36 ft at 11:30PM May 21, 2022Observed: 1.35 ft at 11:45PM May 21, 2022Observed: 1.35 ft at 12:00AM May 22, 2022Observed: 1.36 ft at 12:15AM May 22, 2022Observed: 1.35 ft at 12:30AM May 22, 2022Observed: 1.35 ft at 12:45AM May 22, 2022Observed: 1.36 ft at 1:00AM May 22, 2022Observed: 1.36 ft at 1:01AM May 22, 2022Observed: 1.36 ft at 1:15AM May 22, 2022Observed: 1.35 ft at 1:30AM May 22, 2022Observed: 1.35 ft at 2:45AM May 22, 2022Observed: 1.36 ft at 3:00AM May 22, 2022Observed: 1.36 ft at 3:15AM May 22, 2022Observed: 1.35 ft at 3:30AM May 22, 2022Observed: 1.35 ft at 3:45AM May 22, 2022Observed: 1.36 ft at 4:00AM May 22, 2022Observed: 1.36 ft at 4:15AM May 22, 2022Observed: 1.34 ft at 4:30AM May 22, 2022Observed: 1.34 ft at 4:45AM May 22, 2022Observed: 1.36 ft at 5:00AM May 22, 2022Observed: 1.36 ft at 5:15AM May 22, 2022Observed: 1.34 ft at 5:30AM May 22, 2022Observed: 1.34 ft at 5:45AM May 22, 2022Observed: 1.36 ft at 6:00AM May 22, 2022Observed: 1.36 ft at 6:15AM May 22, 2022Observed: 1.35 ft at 6:30AM May 22, 2022Observed: 1.36 ft at 6:45AM May 22, 2022Observed: 1.36 ft at 7:00AM May 22, 2022Observed: 1.36 ft at 7:15AM May 22, 2022Observed: 1.35 ft at 7:30AM May 22, 2022Observed: 1.36 ft at 7:45AM May 22, 2022Observed: 1.35 ft at 8:00AM May 22, 2022Observed: 1.37 ft at 8:15AM May 22, 2022Observed: 1.36 ft at 8:30AM May 22, 2022Observed: 1.36 ft at 8:45AM May 22, 2022Observed: 1.36 ft at 9:00AM May 22, 2022Observed: 1.36 ft at 9:01AM May 22, 2022Observed: 1.36 ft at 9:15AM May 22, 2022Observed: 1.36 ft at 9:30AM May 22, 2022Observed: 1.36 ft at 9:45AM May 22, 2022Observed: 1.36 ft at 10:00AM May 22, 2022Observed: 1.37 ft at 10:15AM May 22, 2022Observed: 1.38 ft at 10:30AM May 22, 2022Observed: 1.37 ft at 10:45AM May 22, 2022Observed: 1.37 ft at 11:00AM May 22, 2022Observed: 1.37 ft at 11:15AM May 22, 2022Observed: 1.37 ft at 11:30AM May 22, 2022Observed: 1.36 ft at 11:45AM May 22, 2022Observed: 1.37 ft at 12:00PM May 22, 2022Observed: 1.38 ft at 12:15PM May 22, 2022Observed: 1.36 ft at 12:30PM May 22, 2022Observed: 1.37 ft at 12:45PM May 22, 2022Observed: 1.37 ft at 1:00PM May 22, 2022Observed: 1.38 ft at 1:15PM May 22, 2022Observed: 1.37 ft at 1:30PM May 22, 2022Observed: 1.36 ft at 2:45PM May 22, 2022Observed: 1.37 ft at 3:00PM May 22, 2022Observed: 1.36 ft at 3:15PM May 22, 2022Observed: 1.36 ft at 3:30PM May 22, 2022Observed: 1.36 ft at 3:45PM May 22, 2022Observed: 1.37 ft at 4:00PM May 22, 2022Observed: 1.36 ft at 4:15PM May 22, 2022Observed: 1.36 ft at 4:30PM May 22, 2022Observed: 1.37 ft at 4:45PM May 22, 2022Observed: 1.42 ft at 5:00PM May 22, 2022Highest Observation: 1.44 ft at 5:06PM May 22, 2022Observed: 1.42 ft at 5:15PM May 22, 2022Observed: 1.42 ft at 5:30PM May 22, 2022Observed: 1.42 ft at 5:45PM May 22, 2022Observed: 1.42 ft at 6:00PM May 22, 2022Observed: 1.4 ft at 6:15PM May 22, 2022Observed: 1.4 ft at 6:30PM May 22, 2022Observed: 1.4 ft at 6:45PM May 22, 2022Observed: 1.39 ft at 7:00PM May 22, 2022Observed: 1.38 ft at 7:15PM May 22, 2022Observed: 1.38 ft at 7:30PM May 22, 2022USGS--Water Resources of the United StatesCIAP4(plotting HGIRG) Graph Created (8:08PM May 22, 2022)ObservedLatest observed value: 1.38 ft at 7:30 PM AST 22-May-2022. Flood Stage is 10 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 Grande De Manati near Ciales. Only observed stages are available for this point.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 16
Moderate Flood Stage: 12
Flood Stage: 10
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 50.00 ft on 08/08/1899
(2) 43.36 ft on 09/20/2017
(3) 36.00 ft on 09/13/1928
(4) 34.00 ft on 09/26/1932
(5) 25.20 ft on 09/10/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 13.58 ft on 07/30/2020 (P)
(2) 43.36 ft on 09/20/2017
(3) 10.58 ft on 11/24/2015
(4) 13.31 ft on 08/23/2014
(5) 12.16 ft on 10/26/2012
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.78 ft on 10/28/1993
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.
About This Location Collapse

Latitude: 18.322438° N, Longitude: 66.459564° W, Horizontal Datum: NAD27

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 10 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 29 140 150 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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