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· Tomorrow & the week: Lake Report or Premium →Best fishing times
All fishTimes by species available in Premium
Wind & weather
National Weather ServiceWhat Thornapple is best for
DNR data
WalleyeCommon7.1
SmallmouthCommon6.5
MuskyPresent4.0
BluegillPanfish, present4.0
PerchPanfish, present4.0
CrappiePanfish, present4.0
LargemouthPresent4.0
Northern pikePresent4.0How we rate
Start from how common the DNR says the fish is (abundant 7.5, common 6, present 3.5). Add 1 if the DNR stocked it in the last 5 years, 0.6 for walleye in two-story or complex lakes, and up to 0.9 for lake size. The DNR counts bluegill, perch and crappie together as panfish, so they share a score.
Depth map
Wisconsin DNRTap a map to zoom. Pinch or scroll to zoom in, drag to move.
Not for navigation. Old survey; depths and weed lines change.
Rules on this lake
DNR · checked 2026-10-08| Walleye | 15" min · keep none 20–24" · 1 over 24" · 3 a dayMay 2, 2026 to March 7, 2027 | Open |
| Musky | 40" min · 1 a dayMay 2, 2026 to December 31, 2026 on open water | Open |
| Northern pike | No size limit · 5 a dayMay 2, 2026 to March 7, 2027 | Open |
| Bass | 14" min · 5 a dayMay 2, 2026 to March 7, 2027 | Open |
| Panfish | No size limit · 25 a dayOpen All Year | Open |
| Sturgeon | Catch and release onlyOctober 1, 2026 to March 7, 2027 | Open |
| Catfish | No size limit · 10 a dayOpen All Year | Open |
Launches & access
2 public- Port Arthur Boat RampDirections
- Boat RampDirections
Before you go
DNRThis is health advice about eating fish, from the DNR. It is not how many you can catch or keep. Catch limits are in Rules.
Eat any amount Bluegill and Sunfish, Bullheads, Crappies, Inland Trout, Yellow Perch
Up to 1 meal a week Bass, Catfish, Pike, Walleye, All Other Species and Sizes
Up to 1 meal a month Muskies
Statewide advice; no lake-specific advisory. Stricter for women who may get pregnant and children under 15. DNR detailsPurple Loosestrife · Rusty Crayfish
Drain all water, remove plants and animals, and never move live fish or bait to another lake.Ice on Thornapple
Reports & estimateReviews
No reviews yetNear Thornapple
Local dealsLocal bait shops, resorts and supper clubs can put a coupon here and on the printed sheet, free for a year. Add your business
Thornapple board
Catches & reportsLakes near Thornapple
Within 25 miles| Lake | Miles | Acres | Max depth |
|---|---|---|---|
| Caley LakeRusk | 3.8 | 55 | 10 ft |
| Round LakeRusk | 6.1 | 105 | 5 ft |
| Amacoy LakeRusk | 6.2 | 278 | 20 ft |
| Boot LakeRusk | 6.4 | 87 | 44 ft |
| Ladysmith FlowageRusk | 6.5 | 288 | 19 ft |
| Pulaski LakeRusk | 7.1 | 126 | 40 ft |
| Dairyland Reservoir (Flambeau)Rusk | 10.6 | 1,745 | 70 ft |
| Holcombe FlowageRusk | 10.9 | 3,890 | 61 ft |
Thornapple questions
How deep is Thornapple Flowage?
Thornapple Flowage is 19 feet at its deepest, and 9 feet deep on average. It covers 266 acres.
What fish are in Thornapple Flowage?
The Wisconsin DNR lists smallmouth bass (common), walleye (common), musky (present), panfish (present), largemouth bass (present), northern pike (present), sturgeon (present) and catfish (present).
Where is the boat launch on Thornapple Flowage?
There are 2 public launches: Port Arthur Boat Ramp and Boat Ramp.
Do I need a trout stamp to fish Thornapple Flowage?
A Wisconsin fishing license covers this lake. No trout or Great Lakes stamp needed here.
What is the walleye limit on Thornapple Flowage?
15" min · keep none 20–24" · 1 over 24" · 3 a day. Season: May 2, 2026 to March 7, 2027.
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Sources: Wisconsin DNR (lake facts, species, rules, stocking, consumption advice, survey map), National Weather Service (forecast). Sun and moon computed for the lake's location. Best times are a model of light and moon, not a promise. Checked 2026-10-08.