Current Wisconsin River Conditions

The data below is collected in real time by the Office of Water Prediction and their partners and is generally updated twice a day.  We’ve shared this information to give you a better idea of what kind of river conditions to expect on your trip and provide a point of reference for anyone concerned with river levels.

High water on the Wisconsin River

We will almost always post updates on the front page of our website when high water or severe weather threaten upcoming trips. While the information below is great guidance, I strongly recommend checking the front page for the final word.

Predicted water flow rates at the Prairie Du Sac dam in CFS
Prairie Du Sac to Spring Green future water level guidance.
Operational Outflow shows planned water releases from the Prairie Du Sac dam operator.
7-day QPF is an average of long range forecasts that take precipitation into account.

The purple ‘Operational Outflow’ line is generally the one you’ll want to follow if your trip is within 2-3 days. The green ‘7 day QPF’ is the next most useful line. It responds to water levels and rainfall forecasts more quickly but will also have significant changes as updates come in. This is useful for getting an idea of what we can expect to happen in the 1-2 week time frame.

Flow Rate Guidelines

<3,000cfs (<1′ deep) | Lots of sandbars, you’ll be doing quite a bit of maneuvering downriver.  Most sandbars are massive and will hold upwards of 150+ people

3,000-10,000cfs (1′- 3′ deep) | Typical summer conditions, plenty of sandbars and easy navigating.  Sandbars are still quite large and can comfortably fit as many as 100 people.

10,000-15,000cfs (3′- 4′ deep) | Large sandbars become small to medium size sandbars. Depending on where you stop, it’s possible you’ll have to share the island on busy weekends.  Figure you’ll be able to find sandbars that will hold up to 30 people.

15,000-20,000cfs (4′- 5′ deep) | Campsites are extremely scarce.  Most sandbars are underwater and overnight trips are definitely not recommended. The small handful of sandbars out there will hold 10 people at most in tight quarters.

>20,000cfs (>5′ deep) | Challenging conditions can develop. No sandbars are available to camp on but you may be able to camp at one of the private campgrounds along the river.

Background Info

The flow rate (measured in cubic feet per second – cfs) is directly related to river depth.  The deeper the river, the exponentially higher the flow rate goes as more volume fills in low lying areas.  You’ll often see most data reported as flow rate-CFS rather than water depth.

For people planning to camp out on the river, flow rates above 17,000cfs (~4.0′ deep) on the Wisconsin River generally result in barely a handful of sandbars above water and camping trips shouldn’t be attempted.  Day trips are generally okay up to about 30,000cfs (~5.5′ deep) at which point it becomes too difficult to find a place to get back in your boat if you’ve capsized.  That said, if you know how to hold a paddle and manage your canoe/kayak, high flow rates can be pretty exciting and give you access to a lot of places within the river way that are normally inaccessible.

On the other end of the spectrum, flow rates below 10,000cfs (~3.0′ deep) will mean plenty of sandbars to choose from and a very gentle current in the range of 2-3mph.  Anything below 5,000cfs means more sandbars than you’ll know what to do with (but still more than enough water to make it down the river).  Because of federally mandated minimum flow rates, it is essentially impossible that you would ever not be able to paddle because of low water.

High water usually works its way through the system in 4-6 days.  The higher the water level, the faster it drains out.  If we’re above 20,000cfs with a dry forecast, expect to be able to get back on the river in under a week.