Fladmark Lake

Otter Tail County, Minnesota - DNR stocking history, depth and survey data

Minnesota · Minnesota Department of Natural Resources (DNR) · DOW 56072700

Fladmark Lake has no DNR stocking rows in LakeFinder; this page carries its DNR depth, access and survey data.

• Fladmark Lake shows no stocking records in Minnesota DNR LakeFinder as of September 2, 2026.
• Maximum depth 45 ft; surface area 59 acres, 21 littoral acres, 1.7 miles of shoreline, per the DNR lake survey.
• Average water clarity (Secchi depth) 20.7 ft.
• Fish species DNR lists here: black bullhead, black crappie, bluegill, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, yellow bullhead.
• 1 public access on the DNR list.
• Most recent DNR fish survey: July 2, 2018 (standard survey).
• Otter Tail County, nearest town Erhard; DNR lake number (DOW) 56072700.

Depth map

Bathymetric contours from the Minnesota DNR lake survey mapped 8/15/1962 (orig map); depths in feet. Simplified for the web; not for navigation.

Public accesses

DNR fish survey, 2018

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.

Fladmark Lake is a 55-acre mesotrophic (moderately fertile) lake located in northwestern Otter Tail County approximately eight miles east of Erhard, MN. The immediate watershed is composed of hardwood forest and grassland. The maximum depth is 45 feet, however, 38% of the lake is 15 feet or less in depth. The secchi disk reading during the 2018 survey was 19.0 feet. Previous secchi disk readings have ranged from 19.0 to 28.0 feet. Fladmark Lake is located entirely within Maplewood State Park. The lakeshore is entirely undeveloped. An earthen public water access is located along the southwest shoreline. Shoal water substrates consist primarily of sand and gravel. Hardstem bulrush is prevalent along the entire shoreline. Special fishing regulations are in effect on Fladmark Lake. The sunfish possession limit is ten. The Black Crappie possession limit is five. All Largemouth Bass and Northern Pike must be immediately released. The objective of these regulations is to improve the size structure of these species. Fladmark Lake can be ecologically classified as a bass-panfish type of lake and this is reflected in the assemblage of the fish community. Northern Pike, Largemouth Bass, and Bluegill are the dominant gamefish species in the fish community. A moderate density Northern Pike population exists. Pike ranged in length from 16.9 to 33.7 inches with an average length and weight of 21.4 inches and 2.4 pounds. Northern pike attain an average length of 18.1 inches at three years of age. The Bluegill population is also moderately abundant. Age data indicate that Bluegill reproduction is consistently good. Twenty-three percent of the Bluegills in the trap net sample were 7.0 inches or greater in length. Bluegills attain an average length of 7.0 inches at seven years of age. Data from recent surveys indicate that a balanced Largemouth Bass population exists. Bass reproduction is consistently good. Bass ranged in length from 5.5 to 15.6 inches. Largemouth Bass attain an average length of 12.4 inches at four years of age. Anglers can also maintain the quality of fishing by practicing selective harvest. Selective harvest encourages the release of medium to large-size fish while allowing the harvest of more abundant smaller fish for table fare. Releasing the medium to large fish will ensure that lake will have enough spawning age fish on an annual basis and will provide anglers with more opportunities to catch large fish in the future. Fladmark Lake is not listed as an infested water. Aquatic invasive species are threatening Minnesota waters. Aquatic invasive…

Minnesota DNR survey narrative, July 2, 2018.

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