Fishing Minnesota's Border Waters: Rules for WI, ND, SD, and Canada

March 19, 2026

Overview

Minnesota shares water borders with Wisconsin, Iowa, North Dakota, South Dakota, and the Canadian province of Ontario. Each border has its own set of fishing regulations that differ from standard statewide rules. Understanding these regulations is essential if you fish the Mississippi River, St. Croix River, Red River, Lake of the Woods, Rainy Lake, or any other border water.

Minnesota-Wisconsin Border

The Minnesota-Wisconsin border follows the Mississippi River from the Iowa border north to the St. Croix River, then follows the St. Croix River north to its headwaters. Lake Superior’s western waters also involve both states.

Mississippi River (MN/WI)

The Mississippi River from the Iowa border upstream to St. Anthony Falls in Minneapolis is managed under a joint Minnesota-Wisconsin border water agreement.

Key rules:

• A valid fishing license from either Minnesota or Wisconsin allows you to fish these waters.
• Border water regulations (specific season dates, size limits, and bag limits) apply — not the standard statewide regulations of either state.
• Walleye limits on the Mississippi are typically 6 in possession, but specific pools may have different rules.
• Northern pike regulations follow their own border water schedule.
• Paddlefish are present in the lower Mississippi and are subject to specific regulations if open to harvest.

Practical notes:

• Pool 4 (Lake Pepin area) is one of the most popular walleye and sauger stretches. Check pool-specific regulations.
• The tailwaters below each lock and dam are prime fishing spots with their own crowds and conventions.
• Boat traffic on the river is heavy in summer. Navigation rules apply alongside fishing regulations.

St. Croix River

The St. Croix forms the border from its confluence with the Mississippi near Hastings north to its headwaters.

Key rules:

• Either state’s license is valid.
• Border water regulations apply.
• The St. Croix is designated as a National Scenic Riverway, which adds some access and use restrictions (no motorized watercraft on certain stretches above Taylors Falls).
• Smallmouth bass fishing is a highlight — the St. Croix is one of the best smallmouth rivers in the upper Midwest. Check border water size and bag limits.

Lake Superior

Minnesota’s North Shore of Lake Superior involves slightly different considerations:

• Lake Superior is managed cooperatively by Minnesota, Wisconsin, and Michigan through interstate compact.
• Minnesota license covers the Minnesota waters of Lake Superior.
• The Minnesota-Wisconsin boundary in the Duluth/Superior harbor area follows the state line — check which side you are on.
• Lake Superior has its own regulations for lake trout, steelhead (rainbow trout), coho and chinook salmon, and stream trout in tributaries. These differ significantly from inland regulations.

Minnesota-North Dakota Border (Red River)

The Red River of the North forms the Minnesota-North Dakota border from the South Dakota line north to Canada.

Key rules:

• A valid fishing license from either Minnesota or North Dakota allows you to fish the Red River and its tributaries where they form the border.
• Border water regulations apply for season dates, size limits, and bag limits.
• The Red River is a significant channel catfish and walleye fishery. Spring walleye runs from Lake Winnipeg draw anglers from across both states.
• Catfish regulations on the border may differ from both states’ statewide defaults. Check the current border water rules.

Practical notes:

• Flooding is common on the Red River, particularly in spring. High water changes access and fishing patterns dramatically.
• Many tributaries (Otter Tail River, Buffalo River, Wild Rice River) have their own regulations once they leave the border zone.

Minnesota-South Dakota Border

The border follows the quartzite ridge and then the Big Sioux River in the southwest corner of the state. The fishing waters here are limited compared to other borders.

Key rules:

• Border water agreements exist for shared waters.
• The Big Sioux River and any shared lakes follow jointly agreed regulations.
• This is a less heavily fished border overall, but check regulations if you fish in the Pipestone/Luverne area.

Minnesota-Iowa Border

The Minnesota-Iowa border follows a surveyed line (not a river for most of its length), so border water issues are minimal. The Mississippi River at the southeastern corner of Minnesota involves Minnesota-Iowa-Wisconsin jurisdiction where all three states meet.

Key rules:

• The Mississippi River pools in the extreme southeast corner of Minnesota are covered by the MN-WI border water agreement.
• Inland lakes and rivers along the surveyed border are managed by whichever state they fall in — no border water provisions.

Minnesota-Canada Border (Ontario)

This is the most complex border water situation in Minnesota. The boundary follows the Rainy River, Rainy Lake, Namakan Lake, and a chain of lakes and rivers through the BWCA/Quetico wilderness.

Lake of the Woods

Key rules:

• The international boundary runs through Lake of the Woods. The southern portion (south of the Northwest Angle and the main boundary line) is in Minnesota waters.
• A Minnesota license covers fishing on the Minnesota side.
• An Ontario fishing license is required for the Canadian side.
• If you cross the international boundary during a fishing trip, you need both licenses.
• Walleye regulations differ between the Minnesota and Ontario sides. Minnesota waters have their own bag and size limits; Ontario has its own.
• Fish caught on one side cannot be counted toward the other side’s limits — they are separate jurisdictions.

Practical notes:

• Most resorts and guides on the Minnesota side fish Minnesota waters exclusively, simplifying licensing.
• The Northwest Angle (accessible only through Manitoba or by water) has its own access considerations.
• Ice fishing on Lake of the Woods in winter is almost entirely on the Minnesota side from the Baudette/Warroad access points.

Rainy Lake and Rainy River

Key rules:

• Minnesota license for the U.S. side; Ontario license for the Canadian side.
• The Rainy River (from International Falls to Lake of the Woods) is a significant walleye fishery with border water regulations.
• Rainy Lake has some of the best walleye, crappie, and smallmouth bass fishing in the state, with the Canadian side offering different (and sometimes more liberal) regulations.
• Voyageurs National Park occupies much of the Minnesota side of Rainy Lake and Kabetogama. Park waters follow Minnesota regulations plus any park-specific additions.

BWCA / Quetico Boundary

Key rules:

• The BWCA (U.S. side) requires a BWCA travel permit in addition to a Minnesota fishing license.
• Quetico Provincial Park (Canadian side) requires a Quetico park permit and an Ontario fishing license.
• The boundary runs through numerous lakes. If you paddle into Canadian waters (which is easy to do unintentionally on some lakes), you need the Ontario license.
• Many BWCA lakes have special fishing regulations — reduced limits, specific size restrictions, and gear limitations. Check the BWCA-specific regulations insert in the Minnesota regulations booklet.
• Motors are prohibited on most BWCA waters, so this is primarily canoe-based fishing.

General Border Water Tips

• Carry both sets of regulations. If you fish border waters regularly, keep the border water regulation inserts from both states in your tackle box.
• Know the boundary line. On large lakes like Lake of the Woods and Rainy Lake, GPS is the only reliable way to know which side of the international boundary you are on.
• When in doubt, follow the more restrictive rule. If you are unsure which regulation applies, keeping the smaller limit and releasing fish at the larger minimum size keeps you legal everywhere.
• Ask local guides and bait shops. Border water regulations can be confusing even for experienced anglers. Local knowledge is invaluable.
• Retain receipts. When crossing international borders with fish, you may need to show documentation. Keep your license, any harvest tags, and identification accessible.