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Rock Lake

Rock Lake, Minnesota — Lyon County.

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371Surface acres
1Public access sites

Surface area: The USGS National Hydrography Dataset outline (NHD Permanent ID 120020115).

Location & fast facts

Where Rock Lake is in Minnesota

The red circle marks Rock Lake.

Fast facts

About Rock Lake

  • County: Lyon
  • Town: Rock Lake
  • Mapped as: Lake or pond (USGS National Hydrography Dataset)
  • Distance: about 140 mi from Minneapolis and 254 mi from Duluth, straight-line (not driving distance)

Towns and counties: U.S. Census Bureau boundaries overlaid on the USGS lake outline.

Fishing in Minnesota

Official Minnesota DNR pages. Rules and fees change; check before you go.

Good for & watch for

Good for

  • Boating. 1 public trailer launch listed (see access)
  • Fishing. Walleye, Black crappie, Bluegill and Yellow perch
  • Camping. 7 campgrounds within 15 mi (list)

Watch for

  • Boat traffic. A public trailer launch means motorboats share the water; expect more traffic on summer weekends.
  • Cold water. Water stays cold well into late spring and turns cold again in fall. Wear a life jacket when paddling in the shoulder seasons.

Built only from the data on this page: official access lists, OpenStreetMap beaches and trails, campground listings, state and USGS invasive-species records. We don't rate crowds or water quality.

Official lake survey (Minnesota DNR)

7.9 ftMaximum depth
379Acres (state figure)

Fish species found in Minnesota DNR lake surveys: Bigmouth buffalo, Black bullhead, Black crappie, Bluegill, Channel catfish, Common carp, Green sunfish, Hybrid sunfish, Orangespotted sunfish, Walleye, White sucker, Yellow perch.

Average depth not published.

Shallow (littoral) area: 379 of 379 acres

Source: Minnesota Department of Natural Resources LakeFinder record for Rock Lake (DOW 42005200), with lake survey reports, depth maps and stocking history. Acreage here can differ slightly from our mapped outline.

Lake map

Rock Lake shoreline, boat launches & beaches

Rock Lake Public Water Access Site (Boat launch)1½ mileN

Numbers on the map match the list at rightbelow.

Boat launch
  1. 1Rock Lake Public Water Access Site
    Boat launch · Rock Lake

Shoreline: USGS National Hydrography Dataset (NHD Waterbody, Permanent ID 120020115), public domain. State outline: U.S. Census Bureau TIGERweb. Points: Minnesota DNR public water access sites (Minnesota Geospatial Commons). Interactive map: Leaflet with © OpenStreetMap contributors. Not for navigation.

Campgrounds near Rock Lake

We found 7 campgrounds and RV parks within 15 miles of Rock Lake, 1 of them within 5 miles. Distances are straight-line from the nearest point on the shoreline, so driving distance is longer.

1 more within 15 miles

All campgrounds & RV parks in Minnesota

Green tent icons on the lake map mark campgrounds near the shore, and the interactive map shows the closest 12. Amenities are listed only where a source records them; call or check the campground's website before you go, since seasons and rates change every year.

Campground data: OpenStreetMap contributors (ODbL). Pulled Oct 12, 2026.

Conditions right now

Air temperature & conditions (nearest NWS station)Loading…
Fetching the latest National Weather Service observation…

Live from the National Weather Service API for the lake's coordinates (44.2759, -95.9354). The nearest station may be several miles away. NWS forecast for Rock Lake. No live water-temperature sensor is shown because we haven't found a public one for this lake.

Sun, moon & best fishing times

Sun & moon at Rock Lake

Best fishing times

Major periodMinor periodDaylight

    Based on solunar theory, an estimate. Major periods (about 2 hours) center on when the moon is directly overhead or underfoot; minor periods (about 1 hour) center on moonrise and moonset. The 0–100 activity score rises during those periods and gets a boost near sunrise and sunset and around the new and full moon. Weather, water temperature and pressure often matter more. Sun and moon times are calculated in your browser from the lake's coordinates with standard astronomy formulas, shown in CT (America/Chicago), and accurate to within a few minutes.

    Boat launches & access sites

    1 public access site listed, 1 with a boat ramp or trailer launch.

    SiteTownOwnerTypeParkingFeeUsesMap
    Rock Lake Public Water Access SiteRock LakeDNR Division of Parks and TrailsTrailer launch · Concrete slab ramp · dock12 trailer—Fishing, Boating44.2707, -95.9343

    Minnesota DNR public water access sites (Minnesota Geospatial Commons)

    Fees, hours and rules change; confirm with the site owner before you go.

    Contact & official info

    Questions about Rock Lake

    How big is Rock Lake?

    Rock Lake covers about 371 acres in Rock Lake, Minnesota (Lyon County).

    How deep is Rock Lake?

    The maximum recorded depth is 8 feet, according to the Minnesota DNR LakeFinder.

    What fish are in Rock Lake?

    Minnesota DNR LakeFinder lists Walleye, Black crappie, Bluegill, Yellow perch, Channel catfish, Bigmouth buffalo, Black bullhead, Common carp, Green sunfish and Hybrid sunfish and 2 more.

    Is there a public boat launch on Rock Lake?

    Yes. 1 public trailer launch is listed: Rock Lake Public Water Access Site. Check posted fees and parking rules.

    Are there campgrounds near Rock Lake?

    Yes. We list 7 campgrounds and RV parks within 15 miles, 1 of them within 5 miles.

    What towns are on Rock Lake?

    Rock Lake touches Rock Lake in Lyon County, Minnesota.

    Share a tip or fishing report

    Know Rock Lake? Tell us about the launch, parking, where they're biting or anything a first-time visitor should know. Tips go privately to the LakeRipple editor; nothing is posted automatically. Helpful tips may be featured on this page (we'll use your first name only if you give one).

    Lakes & ponds nearby

    Straight-line distance between lake centers. All Minnesota lakes & ponds · All waters in Rock Lake