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Hydrograph River at a Glance Download
South Branch Ontonagon at Ewen Stage (ft)EWNM4(plotting HGIRZ) Graph Created (6:15AM May 28, 2024)Flood Stage is 33 ft
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Tabular Data (UTC)
Tabular Data (EDT)
XML Data
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Datum: NAVD88
NOTE: Stage measured manually and reported by river observer. No automated gauge on-site.

NOTE: Forecasts are not available for the South Branch Ontonagon at Ewen. Only observed stages are available for this point.

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Upstream Gauge - at Cisco Lake Upstream Gauge Downstream Gauge Downstream Gauge - near Rockland
Flood Categories (in feet)
Major Flood Stage: 37.5
Moderate Flood Stage: 36.5
Flood Stage: 33
Action Stage: 31.5
Low Stage (in feet): -9999

Historic Crests
(1) 33.87 ft on 04/30/2013
(2) 33.00 ft on 04/23/2019

(P): Preliminary values subject to further review.

Recent Crests
(1) 33.00 ft on 04/23/2019
(2) 33.87 ft on 04/30/2013

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:16
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Gauge LocationGauge Map Marker
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
36.5 Buildings in the lumber yard near the M-28 bridge begin to flood
34.5 The entire M-28 bridge is under water...with around a foot of water flowing over the east side of the bridge
34 Water flows over the east side of the M-28 bridge
33 The lumber yard near the M-28 bridge in Ewen begins to flood
28.5 Water reaches the bottom of the M-28 bridge
About This Location Collapse

Latitude: 46.535000° N, Longitude: 89.276667° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 33 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 1100.00 ft 1133.00 ft 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 Not Available Not Available  

Current/Historical Observations:

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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
Marquette Weather Forecast Office
112 Airpark Drive South
Negaunee, MI 49866
(906) 475-5212
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Page last modified: 30-Oct-2020 4:10 PM
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