South Twin Lake (Mahnomen County)

Mahnomen County, Minnesota - DNR stocking history, depth and survey data

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 44001400

DNR records show 24 stocking entries at South Twin Lake (Mahnomen County) since 2016, most recently walleye adults in 2025 (23 fish).

• South Twin Lake (Mahnomen County) has 24 DNR stocking records across 10 years (2016-2025): walleye (24).
• The most-stocked species by count is walleye: 102,734 fish on record.
• Maximum depth 29 ft; surface area 1,127 acres, 525 littoral acres, 5.1 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 9.4 ft.
• Fish species DNR lists here: black bullhead, black crappie, bluegill, brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, tullibee (cisco), walleye, and 3 more.
• 1 public access on the DNR list.
• Most recent DNR fish survey: August 13, 2024 (targeted survey).
• Mahnomen County, nearest town Waubun; DNR lake number (DOW) 44001400.

Depth map

Bathymetric contours from the Minnesota DNR lake survey mapped 6/23/1976 (orig map); depths in feet. Simplified for the web; not for navigation.

Stocking history

¹ fish purchased and stocked by private citizens and sporting groups. ⁶ fish cooperatively purchased, raised, and/or stocked by White Earth Nation.

Public accesses

DNR fish survey, 2024

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.

A targeted survey of nearshore fish species in South Twin Lake was conducted on August 13th, and 14th, 2024, by Detroit Lakes Fisheries Staff. The survey consisted of 14 sampling stations evenly spaced around the lake. All stations were sampled with a backpack electrofishing unit, 11 were sampled with a 50-foot seine and one station was sampled with a 15-foot seine. Two stations were not sampled with a seine due to dense vegetation (Chara) which made it impossible to effectively use a seine. Nearshore sampling captured 12 species of native fish, which included only one species that is intolerant of disturbance (Iowa Darter) and one species that is tolerant of disturbance (Green Sunfish). The three most common species captured during the nearshore survey in order of abundance were: Bluegill, Yellow Perch and Largemouth Bass. The nearshore fish survey data was combined with the standard survey data from July 2024 to describe the fish community and provide a Fish-based Index of Biotic Integrity (FIBI) score. The FIBI uses fish community data to measure a lake's health, and the types of fish species present can help identify any stressors that may be negatively affecting the lake environment. In Minnesota lakes, certain fish species cannot survive without clean water and a healthy habitat (e.g., Blackchin Shiner, Iowa Darter, and Rock Bass), while other species are tolerant of degraded conditions (e.g., Black Bullhead, Fathead Minnow, and Green Sunfish). The FIBI score, composed of several fish community diversity and composition metrics, indicates the overall health of a lake by comparing it to what is expected for a healthy lake. For additional information on the FIBI, search for "lake index of biological integrity" on the mndnr.gov website. Data from this survey will contribute biological information about the health of the fish community to a watershed assessment process in coordination with MN Pollution Control Agency. South Twin Lake is located in the Otter Tail River Watershed.

Minnesota DNR survey narrative, August 13, 2024.

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