Mallen Pit
Crow Wing County, Minnesota - DNR stocking history, depth and survey data
Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 18074000
DNR records show 12 stocking entries at Mallen Pit since 2016, most recently brook trout yearlings in 2025 (400 fish).
- Mallen Pit has 12 DNR stocking records across 10 years (2016-2025): brook trout (9), rainbow trout (3).
- The most-stocked species by count is brook trout: 3,689 fish on record.
- Maximum depth 95 ft; surface area 6 acres, 0.3 miles of shoreline, per the DNR lake survey.
- Average water clarity (Secchi depth) 28.0 ft.
- Fish species DNR lists here: bluegill, brook trout, hybrid sunfish, largemouth bass, northern pike.
- 1 public access on the DNR list.
- Most recent DNR fish survey: (standard survey).
- Crow Wing County, nearest town Riverton; DNR lake number (DOW) 18074000.
Stocking history
| Year | Species | Size | Number | Pounds |
|---|---|---|---|---|
| 2025 | Brook Trout | yearlings | 400 | 103.9 |
| 2024 | Brook Trout | yearlings | 400 | 78.6 |
| 2023 | Brook Trout | yearlings | 400 | 174.7 |
| 2022 | Brook Trout | fingerlings | 400 | 40.0 |
| 2021 | Brook Trout | fingerlings | 739 | 26.3 |
| 2021 | Brook Trout | yearlings | 500 | 252.5 |
| 2020 | Brook Trout | adults | 50 | 104.2 |
| 2020 | Brook Trout | yearlings | 400 | 571.4 |
| 2019 | Brook Trout | yearlings | 400 | 166.0 |
| 2018 | Rainbow Trout | yearlings | 403 | 139.4 |
| 2017 | Rainbow Trout | yearlings | 657 | 216.9 |
| 2016 | Rainbow Trout | yearlings | 303 | 25.7 |
Field note · Minnesota stocks by year, not by truck day: walleye fry go in within weeks of ice-out, fingerlings and yearlings mostly in fall, and stream trout in spring and fall. A row here means the fish went in during that year; DNR adds the year's rows after the fact, so the current year can look empty until winter.
Public accesses
| Type | Owner | Where |
|---|---|---|
| CA | county | - Limited parking along road. |
DNR fish survey, 2012
| Species | Gear | Catch per net | Total catch | Avg lb |
|---|---|---|---|---|
| Bluegill | Standard gill nets | 26.50 | 53 | 0.31 |
| Largemouth bass | Standard gill nets | 1.00 | 2 | 0.33 |
| Northern pike | Standard gill nets | 0.50 | 1 | 7.31 |
| Brook trout | Standard gill nets | 0.50 | 1 | 0.37 |
| Bluegill | Standard trap nets | 25.00 | 50 | 0.17 |
| Hybrid sunfish | Standard trap nets | 1.00 | 2 | 0.18 |
Catch per net (CPUE) is the DNR survey's count per gill net or trap net set; higher means more of that species were sampled, not a fishing forecast. Top species per gear shown; where we have no verified common name for a DNR code, the code itself is shown.
Mallen Mine Lake is a small former open pit iron mine located between Riverton and Ironton that has filled with water. The maximum water depth is over 80 ft and the water is very clear with visibility to a depth of nearly 30 ft. A carry-in access is located on County Road 127. Mallen is a designated stream trout lake. Designated stream trout lakes have additional angling regulations. Be sure to consult the current Minnesota Fishing Regulations book for regulations, seasons, and possession limits before fishing designated trout waters. The paved Cuyuna Lakes State Trail is located just north of the lake. A survey of the fish community in Mallen Mine Lake was conducted in August 2012. The total catch in the gill nets was an average of 28.5 fish per set which was moderately high compared to other Cuyuna mine pit lakes where average gill net catches have ranged from 2 to 63 total fish per net in recent surveys (median of 10.5 fish per net). Most of the gill net catch was bluegills. Only one 10-inch brook trout was captured and that was an age-1 fish from the early April 2012 stocking of 406 yearling Minnesota Wild strain fish. Other species captured in the gill nets include largemouth bass and northern pike. The trap net catch was also mostly bluegills with most measuring from 5 to 8 inches long. The dissolved oxygen and temperature profiles were measured on August 14, 2012 to monitor habitat for trout. Optimal temperature and oxygen conditions for brook trout (10-16 C, greater than or equal to 5 ppm DO) occurred in about 11 vertical ft, from a depth of about 24 ft through nearly 34 ft. Oxygen was adequate for trout (greater than 5 ppm) down to a depth of 43 ft where the temperature was 6.9 C. Trout stocking began in 1988 and usually about 400 yearling brook trout have been stocked each spring.
Minnesota DNR survey narrative, .
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Stocking rows, depths, accesses and survey figures are Minnesota DNR LakeFinder data as of 2026-09-02. Regulations, slot limits and special rules are on the DNR page linked above, not here.
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