Fishing Regulations · 2026 season
Fourth Lake Fishing Regulations
Fourth Lake follows Minnesota statewide fishing regulations — no lake-specific special rules in DNR records.
On the LakeGrade rubric Fourth Lake fails the cutoffs — a TSI of 72 and persistent algal pressure put it in the bottom tier. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.
The hypereutrophic status — TSI 72 — reflects sustained heavy nutrient loading from the surrounding watershed and frequent algal pressure. A maximum depth of 20 ft puts Fourth Lake in the middle of Minnesota's depth distribution. At 205 acres, Fourth Lake fits the Minnesota median for monitored lakes, with 7.8 miles of shoreline. Within the 215 graded lakes of St. Louis County, Fourth Lake sits at rank 210, near the bottom of the county list.
Full water-quality breakdown: Fourth Lake water-quality report.
Minnesota Statewide Regulations
These apply to Fourth Lake (no lake-specific overrides found).
- Walleye
Statewide bag limit: 6 walleye, only 1 over 20 inches. Possession limit 6 (varies on border waters). Open season typically May 9 — Feb 28.
- Sauger
Statewide bag limit: 6 sauger or walleye-sauger combined. Open season typically May 9 — Feb 28.
- Northern Pike
Statewide three-zone northern pike regs: north zone (10 fish, all sizes); central (2 fish 22–26", plus 8 under 22"); south (2 fish over 24"). See MN DNR for zone map.
- Largemouth Bass · Smallmouth Bass
Statewide bag limit: 6 in combination. Catch-and-release only in late season for some lakes; harvest typically opens late May. Some lakes have special slot or season rules.
- Muskellunge
Statewide minimum 54 inches, daily limit 1. Catch-and-release strongly encouraged due to high mercury and slow growth.
- Lake Trout · Brook Trout · Brown Trout · Rainbow Trout · Splake
Stream trout limit 5 per day; lake trout limit varies by lake (often 2). Designated Trout Lakes have special regulations and require trout stamp.
- Sunfish · Bluegill · Crappie · Yellow Perch
Statewide combined bag limit: 20 sunfish, 10 crappies, 20 yellow perch (some lakes have reduced panfish limits to protect quality).
Always Verify with the Official Source
Fishing regulations change annually. Before you fish Fourth Lake, check the official Minnesota DNRfor the most current rules — including border-water exceptions, emergency closures, and 2026 season dates.
Official MN DNR LakeFinder →Frequently Asked Questions
Are there special fishing regulations on Fourth Lake?
Fourth Lake appears to follow Minnesota statewide fishing regulations — DNR records do not show lake-specific special rules. Always confirm with current DNR regulations before fishing, since rules can change annually.
What is the walleye limit on Fourth Lake?
Statewide MN walleye limit: 6 fish, only 1 over 20 inches. Open season May 9 — Feb 28. Fourth Lake appears to follow this statewide rule.
When does the Minnesota fishing season open at Fourth Lake?
Minnesota's general fishing opener for walleye, northern pike, and lake trout falls on the Saturday closest to May 12 each year — for 2026, that's typically the second weekend of May. Bass season opens later (late May for catch-and-release, mid-June for harvest in many lakes). Panfish are open year-round on most waters.
Do I need a fishing license at Fourth Lake?
Yes. Anyone 16 or older needs a current Minnesota fishing license to fish Fourth Lake. Some species require additional stamps (trout, salmon, musky in WI). Buy online at the MN DNR website or at any authorized retailer.
Related
Regulations sourced from Minnesota DNR LakeFinder (DOW 69056800), 2026 season. Last updated: 2026-07-06. This site is not affiliated with any government agency. Always confirm rules with the official DNR before fishing.