Sondaq turns Minnesota's public water data into something you can actually fish with.

Named for the sonar sounding probe, Sondaq pulls together depth contours, fish population surveys, stocking records, weather, river levels, and water conditions for lakes and rivers across the state, then puts it all on one map.

FIND YOUR WATER

Search nearly 14,000 Minnesota lakes and more than 20,000 rivers, streams and creeks by name, or browse the map and filter by what matters: which species are present, whether there's public access, and whether the water has an aquatic invasive species designation.

RIVERS, STREAMS AND CREEKS

Every flowing water the state can reliably identify is on the map, from the Mississippi down to a named creek. The Mississippi is split into the 24 reaches and navigation pools anglers actually name, from Itasca to the Iowa line.

For each one: public accesses with river miles and directions, fishing regulations, trout stream designations covering more than 5,400 waters, MPCA water quality and impairment listings, and live flow and river levels from around 690 DNR, USGS and National Weather Service gauges.

KNOW WHAT'S IN THERE

Real Minnesota DNR survey data for more than 3,600 lakes, some going back to the 1980s. See which species were netted, catch rates by gear type, size distribution charts, and multi-year population trends. This is the same data biologists use, presented so you don't have to read a PDF.

SEE THE BOTTOM

Depth contours for roughly 2,000 surveyed lakes, shaded and labeled, so you can find breaklines, humps, and drop-offs before you launch.

CHECK CONDITIONS

Seven-day National Weather Service forecasts, plus marine and small craft alerts. A surface reading for each lake, from calm to whitecaps, based on the wind and the lake's size. Real-time flow and water levels wherever a gauge exists.

FIND YOUR WAY BACK

Record your trail on the ice or on the water. Sondaq keeps recording with the phone in your pocket and shows the distance and direction back to where you started. Drop waypoints for the dock, your entry point, a hole, a hazard. Trails stay on your phone and never leave it.

PLAN THE SEASON

Ice-out history for around 1,900 lakes. Stocking history straight from the DNR. Aquatic invasive species designations flagged clearly so you know the rules before you move your boat.

LEARN THE FISH

Species pages covering habitat, seasonal behavior, and recommended presentations. Find waters near you that hold the species you're after.

BOATING AND ICE SAFETY

Guides for boating rules and ice conditions, in the app.

FREE AND PRO

The public agency data is free. Depth maps, survey results, species lists, stocking records, ice-out history, invasive species designations, river levels, and weather don't cost anything and never will.

Trail recording and the way back are free; Pro keeps your trails past 30 days.

Sondaq Pro adds the computed layer: fishing quality scoring for shore, dock, and boat, today's species outlook with a confidence level and a concrete recommendation, "Best time to fish here" as a ranked forecast for the days ahead, and multi-year population trend analysis.

BUILT HONESTLY

Not every water has every kind of data. Most Minnesota lakes have never been surveyed for depth, and only a fraction have recent fish population work. The DNR does survey streams, but keeps those results internal, so Sondaq shows no fish surveys for rivers at all.

Where data doesn't exist, Sondaq says so instead of making something up. Every water has a coverage panel that tells you what is missing and why, and you can ask the DNR to survey a water from the app. No fabricated ratings, no filler.

No ads. No tracking. Your location, if you share it, stays on your device.

COMING SOON

Wisconsin and Michigan coverage.

Sondaq is built by GraniteCore Technologies in Minnesota. Data comes from the Minnesota DNR, MPCA, USGS, the US Army Corps of Engineers, and the National Weather Service.