What You'll Find at Upper St. Croix Lake

Upper St. Croix Lake is a 4,600-acre impoundment in Burnett County, Wisconsin, formed by a dam on the St. Croix River. The lake holds walleye, northern pike, muskellunge, largemouth bass, and panfish — a mixed fishery that rewards different techniques depending on the season and which species you're after. The water is moderately clear to stained, with depths ranging from shallow bays to 60 feet in the main basin, and the shoreline mixes rocky points, sandy flats, and wooded banks.

The lake sits about 90 minutes northeast of the Twin Cities and is accessible from several public landings. It's a working impoundment, so water levels fluctuate seasonally — spring runoff raises the lake, and summer drawdown for power generation can expose shallow structure. That variation shapes where fish hold and how you'll fish them month to month.

Key Takeaways

  • Upper St. Croix Lake holds walleye, pike, and musky, with walleye most consistent and accessible to most anglers.
  • Spring and fall are peak seasons; summer drawdown exposes shallow structure and can concentrate fish in deeper water.
  • Public landings are available at Trego and Siren, with parking and vault toilets but no fuel or bait sales on-site.
  • Wisconsin fishing licenses and a trout stamp (if you plan to fish the river) are required; walleye and pike have bag limits that vary by season.
  • The lake is coldest and clearest in winter, making it a destination for ice fishing when the ice is safe.

Seasons and What to Expect

Spring (April through May) brings the most active walleye bite. As water temperatures climb from the 40s to the low 50s, walleye move from deep winter holes into shallower structure — rocky points, sand flats, and the edges of weed beds. Early morning and evening are most productive. Pike are also active in spring, particularly in shallow bays where they spawn; they'll hit large crankbaits and live baitfish. Water levels are typically high from snowmelt and river flow.

Summer (June through August) is when the lake's drawdown becomes most noticeable. Water levels drop as the power company releases water downstream, sometimes by 3 to 4 feet. Walleye move deeper, into the 30- to 50-foot range, and night fishing becomes more productive than day fishing. Pike retreat to deeper water as well, though they'll still hunt in early morning. Musky fishing picks up in July and August; they prefer low-light conditions and structure like submerged timber and rocky humps. Panfish (bluegill and crappie) remain shallow and are easiest to find in the bays.

Fall (September through October) is the second-best season. As water cools and daylight shortens, walleye move back into shallower structure and feed more actively throughout the day. Pike become aggressive again, and musky fishing remains good through October. Water levels begin to stabilize as drawdown slows. This is also when many anglers target walleye with live bait — shiners and crawfish — along rocky shorelines and points.

Winter (November through March) brings ice fishing for walleye and pike. The lake typically freezes by mid-December and remains solid through February. Ice thickness varies, but 12 inches is common by January. Walleye congregate in deeper basins and along drop-offs; jigging with small spoons and live minnows is standard. Pike fishing is slower but possible in shallower bays. Always check ice conditions with local bait shops or the Wisconsin DNR before heading out.

How to Reach Upper St. Croix Lake and Where to Launch

The lake is accessed via Wisconsin Highway 35, which runs along the western shore. Two public landings serve the lake: the Trego Landing (on the north end, near the town of Trego) and the Siren Landing (on the south end, near Siren). Both have paved ramps, parking for vehicles and trailers, and vault toilets. Neither has fuel, bait sales, or overnight camping.

Trego is the smaller and quieter launch; it's best for anglers heading to the northern basin and the rocky structure near the dam. Siren is larger and more developed, with better parking and easier access to the southern bays and shallower flats. Both landings are free and open year-round, though winter access depends on road conditions and parking lot maintenance.

The nearest towns with services — gas, food, lodging, and bait shops — are Trego (minimal services) and Siren (small grocery and gas). For more complete services, Grantsburg (about 20 minutes south) has restaurants, hotels, and tackle shops. Stock up on bait and supplies before you arrive at the lake, as on-site options are limited.

Walleye Fishing: The Most Consistent Target

Walleye are the lake's most abundant gamefish and the most forgiving for anglers of mixed skill. Spring and fall are peak seasons. In spring, fish rocky points and the transition zones between shallow flats and deeper water — typically 8 to 15 feet deep. Live shiners or crawfish under a slip sinker rig work well, as do crankbaits that mimic baitfish. Fish early morning and evening; midday bites are rare.

Summer walleye require deeper presentations. Move to the main basin and fish the 35- to 50-foot range, particularly along drop-offs and submerged humps. Vertical jigging with live minnows or soft plastics is most effective. Night fishing (after dark) produces better results than day fishing, especially on the full moon when light penetrates deeper. Many anglers fish from 10 p.m. to 2 a.m. in summer.

Fall mirrors spring: shallow structure, live bait, and low-light periods. The advantage is that walleye feed more actively throughout the day as water cools. Bag limits are typically 5 walleye per day, but check the current Wisconsin DNR regulations before you fish, as limits can change by season and management area.

Pike and Musky: Larger Fish, Longer Waits

Northern pike are abundant and aggressive, making them a good secondary target or a primary focus if you prefer explosive strikes. Spring and fall are most productive. Pike hunt in shallow bays and along weed edges; large crankbaits (4 to 6 inches), spinnerbaits, and live baitfish (shiners or small sunfish) all work. Early morning is best. Summer pike move deeper but remain active in low-light conditions. Musky are present but less abundant; they require patience and large presentations — 8- to 10-inch crankbaits, swimbaits, and live baitfish. Musky fishing is most productive in July and August, particularly at dawn and dusk.

Pike bag limits are typically 3 per day; musky are often catch-and-release only or limited to 1 per day. Verify current regulations with the Wisconsin DNR before you fish.

Regulations and Licenses

You need a valid Wisconsin fishing license to fish Upper St. Croix Lake. Licenses are sold online through the Wisconsin DNR website, at bait shops in Grantsburg and Siren, and at many sporting goods stores. A daily license costs less than a full-season license if you're visiting for a short trip.

Walleye, pike, and musky all have bag and size limits that vary by season and management area. Upper St. Croix Lake falls under the Northern Wisconsin Management Zone. Walleye typically have a 5-fish daily limit with a 15-inch minimum size, but this can change. Pike usually allow 3 fish per day with a 24-inch minimum. Musky are often catch-and-release only or limited to 1 fish per day with a 40-inch minimum. Check the current Wisconsin DNR fishing regulations guide before you go, as rules change annually.

If you plan to fish the St. Croix River (upstream or downstream of the lake), you may need a trout stamp in addition to your fishing license. The river has trout habitat in some sections, and regulations differ from the lake. Confirm with the DNR if your plans include river fishing.

What to Bring and When to Go

Upper St. Croix Lake is best fished from a boat; shore fishing is limited due to the shoreline's mix of private land and difficult access. Bring a 16- to 20-foot boat with a trolling motor for precise positioning over structure. A depth finder is essential for locating walleye and pike, especially in summer when fish move deeper.

Spring (late April through May) and fall (September through October) are the most rewarding times for most anglers. Weather is mild, fish are active, and you don't need specialized ice-fishing gear. Summer is productive if you're willing to fish at night and adapt to the lake's drawdown. Winter ice fishing is excellent for walleye but requires experience with ice safety and specialized equipment.

Bring rain gear, sunscreen, and a hat — the lake is exposed and weather can change quickly. Bait and tackle shops in Grantsburg carry live shiners, crawfish, and basic lures, but selection is limited. If you have specific tackle preferences, bring them with you.

Frequently Asked Questions

Is Upper St. Croix Lake good for beginners?

Yes, particularly for walleye fishing. The lake has abundant walleye, and spring and fall offer consistent bites with simple live-bait rigs. Pike fishing is also forgiving — they're aggressive and willing to strike a variety of lures. Musky fishing requires more skill and patience.

What's the best time to fish if I can only go once?

Late April or May (spring) or September (fall). Both seasons offer active fish, mild weather, and good results for walleye and pike. Summer requires night fishing and deeper presentations; winter requires ice-fishing experience and equipment.

Can I fish from shore?

Shore access is limited. Most shoreline is private or difficult to reach. A boat is strongly recommended. If you don't own one, rental options may be available in Grantsburg or Siren; call ahead to confirm availability and pricing.

How does the summer drawdown affect fishing?

Water levels drop 3 to 4 feet, exposing shallow structure and concentrating fish in deeper water. Walleye move to 35- to 50-foot depths, and night fishing becomes more productive than day fishing. Pike and musky also move deeper but remain catchable in low-light conditions.

Do I need a guide?

No, but a guide can accelerate your learning, especially if you're unfamiliar with the lake's structure or summer fishing patterns. Local guides operate out of Grantsburg and Siren; contact the local chamber of commerce or bait shops for referrals.