Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

Experimental National Water Center Products: The National Hydrologic Discussion, Area Hydrologic Discussion, and Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via https://www.weather.gov/owp/operations, as described in the StoryMap here.

Weather Forecast Office Green Bay, WI

North Central River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental)

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Printable Image About this graph Tabular Data (UTC) Tabular Data (CDT) Datum: NAVD88 Metadata

NOTE: Gauge reading affected by power generation. NOTE: Forecasts for the Wisconsin River at Merrill are issued as needed during times of high water, but are not routinely available.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 15 Moderate Flood Stage: 13.5 Flood Stage: 11 Action Stage: 10 Low Stage (in feet): 4 Historic Crests (1) 18.26 ft on 08/31/1941 (2) 17.50 ft on 07/24/1912 (3) 13.85 ft on 09/18/1942 (4) 13.28 ft on 04/14/2023 (5) 13.28 ft on 04/14/2023 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 13.28 ft on 04/14/2023 (2) 13.28 ft on 04/14/2023 (3) 11.97 ft on 04/14/2022 (4) 8.61 ft on 04/13/2021 (5) 10.42 ft on 03/30/2020 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records (1) 2.00 ft on 09/15/1910 (2) 2.86 ft on 08/06/2005 (3) 2.90 ft on 08/11/2009 (4) 3.28 ft on 08/13/2007 (5) 3.35 ft on 08/10/1934 Show More Low Water Records For more information on your flood risk go to www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:14 Legend FEMA Layer Gauge Location 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

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18	The Merrill sewage disposal plant...area parks and lowland are flooded. The western approach of Highway 64 bridge is covered with floodwaters.
16	The west approach to the highway 64 bridge becomes flooded.
13	Several feet of water may be covering area parks and lowland in Merrill. Floodwaters reach the base of the river gauging station.
11	Flooding mainly affects Merrill area parks and agricultural land.
10	There is minor lowland flooding. Flood stage is at 11 feet.
3.5	About 2 feet below normal stage...submerged rocks and structures may become more hazardous to boaters over more sections of the river.
Photos (1) Riverside park in Merrill at 12.35 feet (2) Downstream looking at the Business 51 bridge. Stage at 6.94 feet.

Low Water Impacts

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2 - 4	Submerged objects become hazardous.

About This Location

Latitude: 45.178056° N, Longitude: 89.681111° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 11 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 1228.83 ft 1139.83 ft Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps NGVD 29 1228.85 ft 1239.85 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: U.S. Geological Survey (USGS) Data and Site Info for Merrill

Additional Information

How low could the river get?

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Inundation Mapping Locations Snow Information

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Palmer Index US Drought Monitor U.S. Geological Survey Wisconsin Manure Management Advisory System

Collaborative Agencies 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 Green Bay Weather Forecast Office 2485 South Point Road Green Bay, WI 54313 (920) 494-2363 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:29 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities