Minnesota · DNR survey data
Rock Lake
Rock Lake covers 342 acres in Aitkin County, running to 13 feet, last surveyed by the DNR in 2025. The Minnesota DNR has not published bathymetry for this lake, so there is no depth map here, just the survey record: what the nets held and how big it ran.
DNR survey data
Fish species
No recent survey rating.
Northern pikeFair numbers6per gill net22"Typical31"Biggest
Lengths measured · 19 fish
Recent · 2025Lengths measured · 1 fish
2025Only 1 fish measured that year — too few to read as a shape.
Lengths measured · 18 fish
2017Lengths measured · 48 fish
2007BluegillJust a few21.8per trap net4"Typical9"Biggest
Lengths measured · 212 fish
Recent · 2025Lengths measured · 14 fish
2025Lengths measured · 198 fish
2017Lengths measured · 1292 fish
2007CrappieJust a few6.8per trap net8"Typical12"Biggest
Lengths measured · 72 fish
Recent · 2025Lengths measured · 2 fish
2025Only 2 fish measured that year — too few to read as a shape.
Lengths measured · 70 fish
2017Lengths measured · 69 fish
2007Yellow perchOne of the best around46per gill net7"Typical10"Biggest
Lengths measured · 153 fish
Recent · 2025Lengths measured · 3 fish
2025Only 3 fish measured that year — too few to read as a shape.
Lengths measured · 150 fish
2017Lengths measured · 150 fish
2007Rates come from standard DNR survey gear (gill nets, trap nets, electrofishing), judged against statewide benchmarks for the same gear — which is why the same number of fish per net can read differently for two species. Where the standard gear can't count a species reliably, the page shows presence and size only. Typical is the middle fish of those measured. Open a row for the full length spread, survey by survey. You can read every number on this page without an app or an account.
Recent reports
Rock Lake fishing reports
Recent reports on Rock Lake from guides, tournaments and regular anglers. Anything posted in the last two weeks also bumps the matching spots on the live map, so you'll see a "matches a recent report" tag on them.
Public water access
Getting on the water
- Rock Lake (trailer launch)
Within 30 miles
Nearby lakes
- Bass Lake · 57 ac · 0.9 mi
- Round Lake · 185 ac · 1.4 mi
- Turner Lake · 63 ac · 1.6 mi
- Portage Lake · 372 ac · 3.3 mi
- Fleming Lake · 319 ac · 5.3 mi
- Wilkins Lake · 349 ac · 5.5 mi
- Rat Lake · 431 ac · 6.5 mi
- Gun Lake · 712 ac · 6.8 mi
Quick answers
Frequently asked questions
Is there a depth map for Rock Lake?
The Minnesota DNR has not published bathymetry for Rock Lake, so this page carries the survey record instead: species, catch rates and stocking history.
What fish are in Rock Lake?
The most recent DNR survey (2025) recorded walleye, largemouth bass, northern pike, bluegill, crappie, yellow perch.
Does Rock Lake have a public access?
Yes. Rock Lake has one public access site: Rock Lake (trailer launch).
Is Rock Lake stocked?
No stocking is on record for Rock Lake in the DNR's stocking database.
When was Rock Lake last surveyed?
The Minnesota DNR last surveyed Rock Lake in 2025, the most recent of 6 surveys on record.
Survey numbers are the Minnesota DNR's. How this site reads them →
Page updated .