About Lake Joanis
Lake Joanis is a scenic Portage County lake worth knowing about, covering 23 acres. Access is limited, which keeps boat traffic low — a plus for solitude seekers. Note that invasive species (Chinese Mystery Snail, Eurasian Water-Milfoil) have been documented here — clean your boat before leaving.
Type: lake · Hydrology: SEEPAGE
Lake Location
44.53570° N, 89.56150° W
WBIC 3000096 · 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 Lake Joanis? Local dining recommendations coming soon.
Content coming soon
Insider Tips
Local knowledge about Lake Joanis — best times to visit, quiet spots, and what the regulars know. Contributed tips coming soon.
Content coming soon
Lake Conditions
Water Clarity
—
No data
Trophic Status
—
No data
Invasive Weeds
Present
Chinese Mystery Snail, Eurasian Water-Milfoil
Seasonal Notes
See below
Ice-out dates, peak fishing windows
Seasonal notes for Lake Joanis coming soon — ice-out timing, peak fishing windows, and fall color dates.
Condition data sourced from Wisconsin DNR surveys. Real-time weed and clarity reports coming soon.
Invasive Species Present
Chinese Mystery Snail and Eurasian Water-Milfoil have been documented in Lake Joanis. 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 Lake Joanis?
Lake Joanis 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 Lake Joanis?
Lake Joanis has 23 acres in surface area.
Are there invasive species in Lake Joanis?
Yes — Chinese Mystery Snail and Eurasian Water-Milfoil have been documented in Lake Joanis. 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 Lake Joanis located?
Lake Joanis is located in Portage County, Wisconsin. GPS coordinates: 44.5357° N, 89.5615° W.
Are there vacation rentals on Lake Joanis?
Stay Northern is building the most complete rental directory for Portage County lakes. Check our Lake Joanis vacation rentals listing — if none are available yet, check back soon or browse nearby Portage County lake rentals.
Fishing Regulations
Current season regulations for Lake Joanis
| 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 | The minimum length limit is 14" 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 | The minimum length limit is 26" and the daily bag limit is 2. | — |
| 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 limit is 15" and 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
- 3000096
- County
- Portage County
- Surface Area
- 23 acres
- Lake Type
- lake
- Coordinates
- 44.5357, -89.5615
Boat Rentals Nearby
Pontoon
Listing soonFishing Boat + Motor
Listing soonKayak / Canoe
Listing soonKnow a local boat rental operator near Lake Joanis? Let us know.
Lake data sourced from the Wisconsin DNR. Last updated 3/24/2026.