About Grettum Flowage
Grettum Flowage is a scenic Burnett County lake worth knowing about, covering 249 acres. Access is limited, which keeps boat traffic low — a plus for solitude seekers. Note that invasive species (Purple Loosestrife) have been documented here — clean your boat before leaving.
Type: flowage · Hydrology: DRAINAGE
Lake Location
45.70990° N, 92.69240° W
WBIC 2637800 · Wisconsin DNRLocal's Guide
Fishing
Species-specific tips above. Wisconsin fishing license required for ages 16+. See current season regulations below.
View fishing regulations ↓Swimming
Check conditions before swimming. No lifeguard on duty. Watch for aquatic vegetation near shorelines.
Content coming soon
Nearby Dining
Looking for supper clubs and bait shops near Grettum Flowage? Local dining recommendations coming soon.
Content coming soon
Insider Tips
Local knowledge about Grettum Flowage — best times to visit, quiet spots, and what the regulars know. Contributed tips coming soon.
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Lake Conditions
Water Clarity
—
No data
Trophic Status
—
No data
Invasive Weeds
Present
Purple Loosestrife
Seasonal Notes
Coming soon
Ice-out dates, peak fishing windows
Condition data sourced from Wisconsin DNR surveys. Real-time weed and clarity reports coming soon.
Invasive Species Present
Purple Loosestrife has been documented in Grettum Flowage. Clean, drain, and dry all watercraft and equipment before leaving.
Report sightings to the Wisconsin DNR invasive species hotline.Frequently Asked Questions
Can you boat on Grettum Flowage?
Grettum Flowage does not currently have a public boat landing listed in the Wisconsin DNR database. Shore fishing or kayak/canoe access may still be available — check local access points.
How big is Grettum Flowage?
Grettum Flowage has 249 acres in surface area.
Are there invasive species in Grettum Flowage?
Yes — Purple Loosestrife has been documented in Grettum Flowage. Please clean, drain, and dry your watercraft and all equipment before leaving any Wisconsin water body to prevent the spread of invasive species.
Where is Grettum Flowage located?
Grettum Flowage is located in Burnett County, Wisconsin. GPS coordinates: 45.7099° N, 92.6924° W.
Are there vacation rentals on Grettum Flowage?
Stay Northern is building the most complete rental directory for Burnett County lakes. Check our Grettum Flowage vacation rentals listing — if none are available yet, check back soon or browse nearby Burnett County lake rentals.
Fishing Regulations
Current season regulations for Grettum Flowage
| Species | Season | Min. Length | Daily Bag |
|---|---|---|---|
| Bullheads | Open All Year | No minimum length limit and the daily bag limit is unlimited. | — |
| Catfish | Open All Year | No minimum length limit and the daily bag limit is 10. | — |
| Cisco And Whitefish | Open All Year | No minimum length limit and the daily bag limit is 10. | — |
| Lake Sturgeon | Closed | No fishing allowed. | — |
| Largemouth Bass And Smallmouth Bass | May 2, 2026 to March 7, 2027 | No minimum length limit and the daily bag limit is 5. | — |
| Muskellunge And Hybrids | May 2, 2026 to December 31, 2026 on open water | The minimum length limit is 40" and the daily bag limit is 1. | — |
| Northern Pike | May 2, 2026 to March 7, 2027 | No minimum length limit and the daily bag limit is 5. | — |
| Paddlefish | Closed | No fishing allowed. | — |
| Panfish | Open All Year | No minimum length limit and the daily bag limit is 25. | — |
| Rock, Yellow, And White Bass | Open All Year | No minimum length limit and the daily bag limit is unlimited. | — |
| Rough Fish | Open All Year | No minimum length limit and the daily bag limit is unlimited. | — |
| Round Goby | Open All Year | The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office. | — |
| Ruffe | Open All Year | The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office. | — |
| Shovelnose Sturgeon | Closed | No fishing allowed. | — |
| Trout | See specific regulations | https://dnr.wisconsin.gov/topic/fishing/trout/ . | — |
| Walleye, Sauger, And Hybrids | May 2, 2026 to March 7, 2027 | The minimum length is 15", but walleye, sauger, and hybrids from 20" to 24" may not be kept, and only 1 fish over 24" is allowed. The daily bag limit is 3. | — |
| White Perch | Open All Year | The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office. | — |
Regulations sourced from Wisconsin DNR fisheries data. Always verify current regulations before fishing.
Lake Details
- WBIC
- 2637800
- County
- Burnett County
- Surface Area
- 249 acres
- Lake Type
- flowage
- Coordinates
- 45.7099, -92.6924
Nearby Trails
St. Croix National Scenic Riverway
200 mi · Burnett/Polk County
Governor Knowles State Forest
40 mi · Burnett/Polk County
Boat Rentals Nearby
Pontoon
Listing soonFishing Boat + Motor
Listing soonKayak / Canoe
Listing soonKnow a local boat rental operator near Grettum Flowage? Let us know.
Lake data sourced from the Wisconsin DNR. Last updated 3/24/2026.