Boulder Lake
About Boulder Lake
Boulder Lake is a 259-acre lake near Prairie Portage in Lake County, Minnesota. It reaches 54 feet at its deepest point, with an average depth of about 14 feet, and has roughly 6.1 miles of shoreline. DNR surveys put average water clarity at about 9 feet.
The DNR has no fish survey on file for this lake, so treat any fishing as exploratory.
The DNR lists public water access for the lake; confirm the launch type before towing a trailer in. 3 campgrounds are mapped close to the shoreline for overnight stays.
Plan Your Visit to Boulder Lake
- 259 acres, up to 54 feet deep, near Prairie Portage
- Public access on record — bring a boat you can hand-launch unless you confirm a ramp
- Average water clarity around 9 feet
- Camping close to the water
Access & Fees
- Public access
- Public access on record
- Launch fee
- Free at DNR accesses
Conditions
- Surface area
- 259 acres
- Max depth
- 54 ft
- Average depth
- 14 ft
- Shoreline
- 6.1 mi
- Water clarity
- 9 ft
- Shallows (under 15 ft)
- 109 acres
Rules & Regulations
- A Minnesota fishing license is required for anglers 16 and older
- Drain plugs must be out and all water drained before leaving any access; remove aquatic plants from boats and trailers
- Children under 10 must wear a life jacket on a boat that is underway
Facilities
- Camping (3 mapped)
Best For
- Lakeside camping
- Quiet paddling
- Ice is never completely safe — check thickness yourself before walking or driving on any lake
Camping & Reservations
3 campgrounds are mapped on or near Boulder Lake. Minnesota state park sites are booked through the DNR reservation system, national forest campgrounds through Recreation.gov, and most state forest campgrounds are first-come, first-served.
Campground locations © OpenStreetMap contributors. Confirm details with the operator.
Activities
Amenities
Fish Species
Plan your trip to Boulder Lake
Compare Boulder Lake against the top-ranked lakes nearby, then map your route.
Nearby Lakes
Adams Lake
60 out of 100 Lake ScoreLake · Ely475 acres
1.4 miles away
Sagus Lake
33 out of 100 Lake ScoreLake · Prairie Portage160 acres
2 miles away
Raven Lake
39 out of 100 Lake ScoreLake · Prairie Portage179 acres
2 miles away
Makwa Lake
36 out of 100 Lake ScoreLake · Prairie Portage128 acres
2.8 miles away
Beaver Lake
40 out of 100 Lake ScoreLake · Prairie Portage218 acres
2.9 miles away
Fraser Lake
46 out of 100 Lake ScoreLake · Prairie Portage695 acres
3.2 miles away
Frequently Asked Questions
Where is Boulder Lake?
Boulder Lake is in Lake County, Minnesota, near Prairie Portage. It covers 259 acres and reaches 54 feet deep.
How big and how deep is Boulder Lake?
Boulder Lake covers 259 acres with about 6.1 miles of shoreline. Its maximum depth is 54 feet and its average depth is about 14 feet.
What fish can you catch at Boulder Lake?
The DNR has no fish survey on file for Boulder Lake.
Is there a public boat launch on Boulder Lake?
Public access is on record, but not a trailer ramp: public access on record.
Can you swim at Boulder Lake?
There is no mapped public swim beach at Boulder Lake. Minnesota's public waters are open to swimming where you have legal access, but there are no lifeguards or water-quality monitoring away from designated beaches.
Can you camp at Boulder Lake?
Yes. A campground is mapped on or near the shore. Confirm whether sites are reservable or first-come, first-served before you go.