See the bottom
~2,000 lakes with depth contours
Shaded and labeled, so you can find breaklines, humps and drop-offs before you launch.
MNFishing map and forecast
Real DNR lake data. Free to look. Pro to know more.
Fish survey history, depth maps, ice-out dates, stocking records, and live weather and water conditions for real DNR-surveyed lakes. Not estimates, not crowdsourced guesses.
- Public agency data is free
- No ads
- No tracking
Now available on iPhone and Android.
- 13,945
- Minnesota lakes of 10+ acres
- 20,000+
- rivers, streams and creeks
- 3,600+
- lakes with DNR fish survey data
- about2,000
- lakes with depth contours
- about690
- live river and lake gauges
Lake count read from Sondaq's own lake data on 13 November 2026: lake and pond basins of 10 acres or more. Other figures are from the Sondaq store listing.
01What it shows
Minnesota's public water data, on one map.
Search by name, or browse the map and filter by species, public access and invasive species designation.
Know what's in there
3,600+ lakes with DNR survey data
Some going back to the 1980s: species netted, catch rates by gear type, size distribution and multi-year trends.
Check conditions
~690 live gauges
Flow and water levels from DNR, USGS and National Weather Service gauges, plus seven-day forecasts and alerts.
Rivers, streams and creeks
20,000+ flowing waters
From the Mississippi down to a named creek, with public accesses, regulations and 5,400+ trout stream designations.
Find your way back
Trails and waypoints
Record your trail on the ice or the water. Trails stay on your phone and never leave it.
Plan the season
~1,900 lakes of ice-out history
With DNR stocking history and invasive species designations flagged clearly.
Sondaq, as it ships
Real screens · App Store listing
02Free and Pro
Two tiers, one simple line.
If it's raw public agency data, it's free, forever. If it's something we computed or derived for you, it's Pro.
Free
Always- Lake maps, boundaries, and access sites
- Fish survey history and species catch data
- Depth maps and bathymetry
- Ice-out dates and stocking records
- Live weather and water-level conditions
- Invasive species alerts
- Trail recording and the way back
Sondaq Pro
Available in the app · free trial- Fishing quality scores for shore, dock and boat
- Today's species outlook, with a confidence level
- “Best time to fish here”, ranked for the days ahead
- Multi-year population trend analysis
- Trails kept past 30 days
- Everything in Free, naturally
03Coverage and sources
Built honestly.
Not every water has every kind of data, and the DNR keeps its stream surveys internal, so rivers show no fish surveys. 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.
Coverage today: Minnesota. More states are under consideration.
State of Minnesota
- Department of Natural Resources
- Pollution Control Agency
Federal
- U.S. Geological Survey
- National Weather Service
- U.S. Army Corps of Engineers
Sondaq is built by GraniteCore Technologies in Minnesota. It is a private company's app, not a government app.
04Privacy
Private by default.
No ads. No tracking. Your location, if you share it, stays on your device. Trails stay on your phone and never leave it.
Get Sondaq.
Free on iPhone and Android, or open the map in your browser.
From the same company
