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Web Portal Changes: In Spring 2024, the Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS) at a repurposed https://water.noaa.gov. A preview of NWPS is available here, where you can see your station hydrograph by replacing SSSSS with the station 5-character id: https://preview.water.noaa.gov/gauges/SSSSS.

Flood Inundation Mapping: Experimental real-time flood Inundation mapping services for 10% of the United States are now available via the NWS Map Viewer. Additional products and geospatial services depicting River Forecast Center and National Water Model forecasts continue to be accessible as described in the StoryMap here.

Please visit https://www.weather.gov/owp/operations for more information.



Hydrograph River at a Glance Download Inundation
Mapping
Ramapo River at Mahwah Stage (ft)Flow (kcfs)Highest Observation: 4.28 ft at 12:15AM Mar 17, 2024Highest Observation: 4.28 ft at 12:30AM Mar 17, 2024Observed: 4.27 ft at 12:45AM Mar 17, 2024Highest Observation: 4.28 ft at 1:00AM Mar 17, 2024Observed: 4.27 ft at 1:15AM Mar 17, 2024Observed: 4.27 ft at 1:30AM Mar 17, 2024Observed: 4.27 ft at 1:45AM Mar 17, 2024Observed: 4.27 ft at 2:00AM Mar 17, 2024Observed: 4.27 ft at 2:15AM Mar 17, 2024Observed: 4.27 ft at 2:30AM Mar 17, 2024Observed: 4.26 ft at 2:45AM Mar 17, 2024Observed: 4.26 ft at 3:00AM Mar 17, 2024Observed: 4.26 ft at 3:15AM Mar 17, 2024Observed: 4.26 ft at 3:30AM Mar 17, 2024Observed: 4.26 ft at 3:45AM Mar 17, 2024Observed: 4.26 ft at 4:00AM Mar 17, 2024Observed: 4.26 ft at 4:15AM Mar 17, 2024Observed: 4.26 ft at 4:30AM Mar 17, 2024Observed: 4.26 ft at 4:45AM Mar 17, 2024Observed: 4.26 ft at 5:00AM Mar 17, 2024Observed: 4.26 ft at 5:15AM Mar 17, 2024Observed: 4.25 ft at 5:30AM Mar 17, 2024Observed: 4.25 ft at 5:45AM Mar 17, 2024Observed: 4.25 ft at 6:00AM Mar 17, 2024Observed: 4.25 ft at 6:15AM Mar 17, 2024Observed: 4.25 ft at 6:30AM Mar 17, 2024Observed: 4.25 ft at 6:45AM Mar 17, 2024Observed: 4.25 ft at 7:00AM Mar 17, 2024Observed: 4.25 ft at 7:15AM Mar 17, 2024Observed: 4.25 ft at 7:30AM Mar 17, 2024Observed: 4.25 ft at 7:45AM Mar 17, 2024Observed: 4.24 ft at 8:00AM Mar 17, 2024Observed: 4.24 ft at 8:15AM Mar 17, 2024Observed: 4.24 ft at 8:30AM Mar 17, 2024Observed: 4.24 ft at 8:45AM Mar 17, 2024Observed: 4.24 ft at 9:00AM Mar 17, 2024Observed: 4.24 ft at 9:15AM Mar 17, 2024Observed: 4.24 ft at 9:30AM Mar 17, 2024Observed: 4.24 ft at 9:45AM Mar 17, 2024Observed: 4.24 ft at 10:00AM Mar 17, 2024Observed: 4.24 ft at 10:15AM Mar 17, 2024Observed: 4.23 ft at 10:30AM Mar 17, 2024Observed: 4.23 ft at 10:45AM Mar 17, 2024Observed: 4.23 ft at 11:00AM Mar 17, 2024Observed: 4.23 ft at 11:15AM Mar 17, 2024Observed: 4.23 ft at 11:30AM Mar 17, 2024Observed: 4.23 ft at 11:45AM Mar 17, 2024Observed: 4.23 ft at 12:00PM Mar 17, 2024Observed: 4.22 ft at 12:15PM Mar 17, 2024Observed: 4.22 ft at 12:30PM Mar 17, 2024Observed: 4.22 ft at 12:45PM Mar 17, 2024Observed: 4.22 ft at 1:00PM Mar 17, 2024Observed: 4.22 ft at 1:15PM Mar 17, 2024Observed: 4.22 ft at 1:30PM Mar 17, 2024Observed: 4.21 ft at 1:45PM Mar 17, 2024Observed: 4.21 ft at 2:00PM Mar 17, 2024Observed: 4.21 ft at 2:15PM Mar 17, 2024Observed: 4.21 ft at 2:30PM Mar 17, 2024Observed: 4.21 ft at 2:45PM Mar 17, 2024Observed: 4.2 ft at 3:00PM Mar 17, 2024Observed: 4.2 ft at 3:15PM Mar 17, 2024Observed: 4.2 ft at 3:30PM Mar 17, 2024Observed: 4.2 ft at 3:45PM Mar 17, 2024Observed: 4.2 ft at 4:00PM Mar 17, 2024Observed: 4.19 ft at 4:15PM Mar 17, 2024Observed: 4.19 ft at 4:30PM Mar 17, 2024Observed: 4.19 ft at 4:45PM Mar 17, 2024Observed: 4.19 ft at 5:00PM Mar 17, 2024Observed: 4.19 ft at 5:15PM Mar 17, 2024Observed: 4.18 ft at 5:30PM Mar 17, 2024Observed: 4.18 ft at 5:45PM Mar 17, 2024Observed: 4.18 ft at 6:00PM Mar 17, 2024Observed: 4.18 ft at 6:15PM Mar 17, 2024Observed: 4.18 ft at 6:30PM Mar 17, 2024Observed: 4.18 ft at 6:45PM Mar 17, 2024Observed: 4.17 ft at 7:00PM Mar 17, 2024Observed: 4.17 ft at 7:15PM Mar 17, 2024Observed: 4.17 ft at 7:30PM Mar 17, 2024Observed: 4.17 ft at 7:45PM Mar 17, 2024Observed: 4.17 ft at 8:00PM Mar 17, 2024Observed: 4.17 ft at 8:15PM Mar 17, 2024Observed: 4.17 ft at 8:30PM Mar 17, 2024Observed: 4.17 ft at 8:45PM Mar 17, 2024Observed: 4.17 ft at 9:00PM Mar 17, 2024Observed: 4.17 ft at 9:15PM Mar 17, 2024Observed: 4.17 ft at 9:30PM Mar 17, 2024Observed: 4.17 ft at 9:45PM Mar 17, 2024Observed: 4.16 ft at 10:00PM Mar 17, 2024Observed: 4.16 ft at 10:15PM Mar 17, 2024Observed: 4.16 ft at 10:30PM Mar 17, 2024Observed: 4.16 ft at 10:45PM Mar 17, 2024Observed: 4.16 ft at 11:00PM Mar 17, 2024Observed: 4.16 ft at 11:15PM Mar 17, 2024Observed: 4.16 ft at 11:30PM Mar 17, 2024Observed: 4.16 ft at 11:45PM Mar 17, 2024Observed: 4.16 ft at 12:00AM Mar 18, 2024Observed: 4.16 ft at 12:15AM Mar 18, 2024Observed: 4.15 ft at 12:30AM Mar 18, 2024Observed: 4.15 ft at 12:45AM Mar 18, 2024Observed: 4.15 ft at 1:00AM Mar 18, 2024Observed: 4.15 ft at 1:15AM Mar 18, 2024Observed: 4.15 ft at 1:30AM Mar 18, 2024Observed: 4.15 ft at 1:45AM Mar 18, 2024Observed: 4.15 ft at 2:00AM Mar 18, 2024Observed: 4.15 ft at 2:15AM Mar 18, 2024Observed: 4.15 ft at 2:30AM Mar 18, 2024Observed: 4.14 ft at 2:45AM Mar 18, 2024Observed: 4.14 ft at 3:00AM Mar 18, 2024Observed: 4.14 ft at 3:15AM Mar 18, 2024Observed: 4.14 ft at 3:30AM Mar 18, 2024Observed: 4.14 ft at 3:45AM Mar 18, 2024Observed: 4.14 ft at 4:00AM Mar 18, 2024Observed: 4.14 ft at 4:15AM Mar 18, 2024Observed: 4.14 ft at 4:30AM Mar 18, 2024Observed: 4.14 ft at 4:45AM Mar 18, 2024Observed: 4.14 ft at 5:00AM Mar 18, 2024Observed: 4.14 ft at 5:15AM Mar 18, 2024Observed: 4.13 ft at 5:30AM Mar 18, 2024Observed: 4.13 ft at 5:45AM Mar 18, 2024Observed: 4.13 ft at 6:00AM Mar 18, 2024Observed: 4.13 ft at 6:15AM Mar 18, 2024Observed: 4.13 ft at 6:30AM Mar 18, 2024Observed: 4.13 ft at 6:45AM Mar 18, 2024Observed: 4.13 ft at 7:00AM Mar 18, 2024Observed: 4.12 ft at 7:15AM Mar 18, 2024Observed: 4.12 ft at 7:30AM Mar 18, 2024Observed: 4.12 ft at 7:45AM Mar 18, 2024Observed: 4.12 ft at 8:00AM Mar 18, 2024Observed: 4.12 ft at 8:15AM Mar 18, 2024Observed: 4.12 ft at 8:30AM Mar 18, 2024Observed: 4.12 ft at 8:45AM Mar 18, 2024Observed: 4.12 ft at 9:00AM Mar 18, 2024Observed: 4.12 ft at 9:15AM Mar 18, 2024Observed: 4.11 ft at 9:30AM Mar 18, 2024Observed: 4.11 ft at 9:45AM Mar 18, 2024Observed: 4.11 ft at 10:00AM Mar 18, 2024Observed: 4.11 ft at 10:15AM Mar 18, 2024Observed: 4.11 ft at 10:30AM Mar 18, 2024Observed: 4.11 ft at 10:45AM Mar 18, 2024Observed: 4.11 ft at 11:00AM Mar 18, 2024Observed: 4.1 ft at 11:15AM Mar 18, 2024Observed: 4.1 ft at 11:30AM Mar 18, 2024Observed: 4.1 ft at 11:45AM Mar 18, 2024Observed: 4.1 ft at 12:00PM Mar 18, 2024Observed: 4.1 ft at 12:15PM Mar 18, 2024Observed: 4.09 ft at 12:30PM Mar 18, 2024Observed: 4.09 ft at 12:45PM Mar 18, 2024Observed: 4.09 ft at 1:00PM Mar 18, 2024Observed: 4.09 ft at 1:15PM Mar 18, 2024Observed: 4.09 ft at 1:30PM Mar 18, 2024Observed: 4.09 ft at 1:45PM Mar 18, 2024Observed: 4.09 ft at 2:00PM Mar 18, 2024Observed: 4.09 ft at 2:15PM Mar 18, 2024Observed: 4.09 ft at 2:30PM Mar 18, 2024Observed: 4.09 ft at 2:45PM Mar 18, 2024Observed: 4.08 ft at 3:00PM Mar 18, 2024Observed: 4.08 ft at 3:15PM Mar 18, 2024Observed: 4.08 ft at 3:30PM Mar 18, 2024Observed: 4.07 ft at 3:45PM Mar 18, 2024Observed: 4.07 ft at 4:00PM Mar 18, 2024Observed: 4.07 ft at 4:15PM Mar 18, 2024Observed: 4.07 ft at 4:30PM Mar 18, 2024Observed: 4.07 ft at 4:45PM Mar 18, 2024Observed: 4.07 ft at 5:00PM Mar 18, 2024Observed: 4.07 ft at 5:15PM Mar 18, 2024Observed: 4.06 ft at 5:30PM Mar 18, 2024Observed: 4.06 ft at 5:45PM Mar 18, 2024Observed: 4.07 ft at 6:00PM Mar 18, 2024Observed: 4.07 ft at 6:15PM Mar 18, 2024Observed: 4.07 ft at 6:30PM Mar 18, 2024Observed: 4.07 ft at 6:45PM Mar 18, 2024Observed: 4.07 ft at 7:00PM Mar 18, 2024Observed: 4.07 ft at 7:15PM Mar 18, 2024Observed: 4.06 ft at 7:30PM Mar 18, 2024Observed: 4.06 ft at 7:45PM Mar 18, 2024Observed: 4.06 ft at 8:00PM Mar 18, 2024Observed: 4.05 ft at 8:15PM Mar 18, 2024Observed: 4.05 ft at 8:30PM Mar 18, 2024Observed: 4.05 ft at 8:45PM Mar 18, 2024Observed: 4.05 ft at 9:00PM Mar 18, 2024Observed: 4.05 ft at 9:15PM Mar 18, 2024Observed: 4.05 ft at 9:30PM Mar 18, 2024Observed: 4.05 ft at 9:45PM Mar 18, 2024Observed: 4.05 ft at 10:00PM Mar 18, 2024Observed: 4.04 ft at 10:15PM Mar 18, 2024Observed: 4.04 ft at 10:30PM Mar 18, 2024Observed: 4.04 ft at 10:45PM Mar 18, 2024Observed: 4.04 ft at 11:00PM Mar 18, 2024Observed: 4.04 ft at 11:15PM Mar 18, 2024Observed: 4.04 ft at 11:30PM Mar 18, 2024Highest Forecast: 4 ft 2:00AM Mar 19, 2024Highest Forecast: 4 ft 8:00AM Mar 19, 2024Highest Forecast: 4 ft 2:00PM Mar 19, 2024Highest Forecast: 4 ft 8:00PM Mar 19, 2024Highest Forecast: 4 ft 2:00AM Mar 20, 2024Forecast: 3.9 ft 8:00AM Mar 20, 2024Forecast: 3.9 ft 2:00PM Mar 20, 2024Forecast: 3.9 ft 8:00PM Mar 20, 2024Forecast: 3.9 ft 2:00AM Mar 21, 2024Forecast: 3.9 ft 8:00AM Mar 21, 2024USGS--Water Resources of the United StatesMAWN4(plotting HGIRG) Graph Created (12:01AM Mar 19, 2024)ObservedForecast (issued 9:38AM Mar 18)Latest observed value: 4.04 ft at 11:30 PM EDT 18-Mar-2024. Flood Stage is 8 ft
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Ramapo River at Mahwah are issued routinely year-round.
Return to Area Map
Upstream Gauge - at Suffern Upstream Gauge Downstream Gauge Downstream Gauge - at Pompton Lakes Dam
Flood Categories (in feet)
Major Flood Stage: 12
Moderate Flood Stage: 9
Flood Stage: 8
Action Stage: 7.5
Low Stage (in feet): 0

Historic Crests
(1) 15.78 ft on 08/28/2011
(2) 12.53 ft on 10/16/1955
(3) 12.52 ft on 09/16/1999
(4) 11.87 ft on 05/29/1968
(5) 11.35 ft on 08/19/1955
(6) 11.16 ft on 03/07/2011
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 15.78 ft on 08/28/2011
(2) 9.55 ft on 04/17/2011
(3) 10.72 ft on 03/11/2011
(4) 11.16 ft on 03/07/2011
(5) 8.07 ft on 12/12/2008
(6) 9.85 ft on 10/13/2005
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:16
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
12 Major flooding along Route 202 and Route 17 intersection. Road closed. Flooding along Riverview Drive and along Halifax Road and Bridle Path Lane. Flooding on Brakeshoe Place, Brook Street and Catherine Avenue.
9 State Route 202 floods downstream. Moderate flooding along Route 202 and Route 17. Water into backyards. Minor flooding along Brakeshoe Place, Brook Street and Catherine Avenue.
8 Minor flooding along Route 202.
Photos
(1) Ramapo River at Mahwah
About This Location Collapse

Latitude: 41.097500° N, Longitude: 74.163333° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 8 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 29 253.1 ft 261.1 ft 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:

Additional Information Collapse
Potential River Levels - Used to
Potential River Levels
Used to Estimate the Chance of Flooding and the Range of Possible River Levels
10 Day (HEFS) 7 Day (NAEFS) 7 Day (GEFS)
HEFS Ensemble NAEFS Ensemble  GEFS Ensemble 

Note: Use the official hydrograph at the top of this web page for river levels within the next 48 hours.

See the Product Description Document link for more details on the interpretation of the 3,7 day graphics. 

Click individual graphics to enlarge.

Forecasts for the Ramapo River at Mahwah are issued as needed during times of high water, and are routinely available.
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
Upton Weather Forecast Office
175 Brookhaven Ave. Bldg. NWS-1
Upton, NY 11973
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Page last modified: 2-Nov-2020 7:30 PM
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