Anna

Anna Lake is a 538-acre mesotrophic (moderately fertile) lake located in south-central Otter Tail County approximately four miles north of Underwood, MN. The immediate watershed is composed primarily of agricultural land interspersed with hardwood woodlots. The maximum depth is 55 feet; however, 69% of the lake is 15 feet or less in depth. The 2025 Secchi disk reading was 12.1 feet. Historical Secchi disk readings have ranged from 4.0 to 9.3 feet. The majority of the shoreline of Anna Lake remains undeveloped. A DNR owned concrete public access is located along the southwest shoreline. Shoal water substrates consist primarily of sand and gravel. Hardstem bulrush and common cattail are prevalent along the entire shoreline of the lake. Emergent aquatic plants such as bulrush and cattail provide valuable fish and wildlife habitat and are critical for maintaining good water quality. They protect shorelines and lake bottoms and absorb and break down polluting chemicals. Emergent plants provide spawning areas for fish such as Northern Pike, Largemouth Bass, and Panfish. They also serve as important nursery areas for all species of fish. Because of their ecological value, emergent plants may not be removed without a DNR permit. To maintain the excellent water quality and angling that this lake has to offer, it is imperative to preserve the quality of the aquatic habitat. A special gillnetting survey was conducted in August 2025 to analyze the Walleye and Northern Pike populations. Walleyes ranged in length from 10.0 to 26.4 inches with a mean length and weight of 14.9 inches and 1.2 pounds. The 2021-, 2022-, and 2024- year classes are strong and should provide good Walleye angling for several years. Walleyes attain an average length of 16.1 inches at four years of age. Northern Pike ranged in length from 22.6 to 29.6 inches with an average length and weight of 24.8 inches and 2.9 pounds. Northern Pike exhibit good growth rates with an average length of 25.4 inches at five years of age. There are no special or experimental harvest regulations in effect for Anna Lake. Anglers can maintain or improve the quality of angling by practicing selective harvest. Selective harvest encourages the release of medium to large fish while allowing the harvest of more abundant smaller fish for table fare. Releasing the medium to large fish will ensure that the 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. Anna Lake was listed as infested with starry stonewort and zebra mussels in 2025. Anna Lake is the first lake within the Fergus Falls Management Area where starry stonewort was documented. Aquatic invasive species are threatening Minnesota waters. Aquatic invasive species can potentially harm water quality, water recreation, aquatic habitat, native species, and fish populations. Anglers can help prevent the introduction and spread of invasive species by following watercraft transportation laws.

Anna Lake is a 538-acre mesotrophic (moderately fertile) lake located in south-central Otter Tail County approximately four miles north of Underwood, MN. The immediate watershed is composed primarily of agricultural land interspersed with hardwood woodlots. Anna Lake has a maximum depth of 55 feet; however, 69% of the lake is 15 feet or less in depth. Historical secchi disk readings have ranged from 4.0 to 12.1 feet. A majority of the shoreline of Anna Lake remains undeveloped. A DNR owned concrete public water access is located along the southwest shoreline. Shoal water substrates consist primarily of sand and gravel with muck being the predominant substrate in the bays. Hardstem bulrush and common cattail are prevalent along the entire shoreline of the lake. Emergent aquatic plants such as bulrush and cattail provide valuable fish and wildlife habitat and are critical for maintaining good water quality. They protect shorelines and lake bottoms and can absorb and break down polluting chemicals. Emergent plants provide spawning areas for fish such as Northern Pike, Largemouth Bass, and panfish. They also serve as important nursery areas for all species of fish. Because of their ecological value, emergent plants may not be removed without a DNR permit. To maintain the excellent water quality and angling that this lake has to offer, it is imperative to preserve the quality of the aquatic habitat. A special spring trapnetting survey was conducted to analyze the Black Crappie population. Catch data indicate that Black Crappies are very abundant. The 2020-year class is extremely strong and should provide consistently good Black Crappie angling for several years. Black Crappies ranged in length from 7.0 to 13.3 inches with an average length of 10.7 inches. Eighty percent of the crappies were 10.0 inches or greater in length. Crappie growth rates are good with an average length of 11.0 inches at five years of age. There are no special or experimental fish harvest regulations in effect for Anna Lake. Anglers can maintain or improve the quality of angling by practicing selective harvest. Selective harvest encourages the release of medium to large fish while allowing the harvest of more abundant smaller fish for table fare. Releasing the medium to large fish will ensure that the 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. Anna Lake was listed as infested with Zebra Mussels and Starry Stonewort in 2025. Aquatic invasive species are threatening Minnesota waters. Aquatic invasive species can potentially harm water quality, water recreation, aquatic habitat, native species, and fish populations. Anglers can help prevent the introduction and spread of invasive species by following watercraft transportation laws.

Anna Lake is a 538-acre mesotrophic (moderately fertile) lake located in south-central Otter Tail County approximately four miles north of Underwood, MN. The immediate watershed is composed primarily of agricultural land interspersed with hardwood woodlots. The maximum depth is 55 feet; however, 69% of the lake is 15 feet or less in depth. Secchi disk readings have ranged from 4.0 to 9.3 feet. The majority of the shoreline of Anna Lake remains undeveloped. A DNR owned concrete public access is located along the southwest shoreline. Shoal water substrates consist primarily of sand and gravel. Hardstem bulrush and common cattail are prevalent along the entire shoreline of the lake. Emergent aquatic plants such as bulrush and cattail provide valuable fish and wildlife habitat, and are critical for maintaining good water quality. They protect shorelines and lake bottoms, and can absorb and break down polluting chemicals. Emergent plants provide spawning areas for fish such as Northern Pike, Largemouth Bass, and Panfish. They also serve as important nursery areas for all species of fish. Because of their ecological value, emergent plants may not be removed without a DNR permit. To maintain the excellent water quality and angling that this lake has to offer, it is imperative to preserve the quality of the aquatic habitat. A spring electrofishing survey was conducted to analyze the Largemouth Bass population. Catch data indicate that Anna Lake has a moderate to high-density Largemouth Bass population. Age data indicate that bass reproduction is consistently good. Largemouth Bass ranged in length from 4.4 to 20.4 inches with an average length and weight of 11.1 inches and 0.9 pounds. Bass attain an average length of 12.6 inches at four years of age. Anglers can maintain or improve the quality of angling 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 the 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. Anna Lake is not listed as an infested water. Aquatic invasive species are threatening Minnesota waters. Aquatic invasive species can potentially harm water quality, water recreation, aquatic habitat, native species, and fish populations. Anglers can help prevent the introduction and spread of invasive species by following watercraft transportation laws.

Based on Minnesota DNR survey data, anglers target Walleye, Largemouth Bass, Black Crappie, Northern Pike, and Bluegill in Anna. See the full species list above for catch rates, size structure, and quality scores.

Minnesota DNR records list public access for Anna. Check the DNR LakeFinder page for the launch type and directions before you go.

Anna has a maximum depth of 55 feet, per Minnesota DNR data.

The most recent Minnesota DNR survey data for the main sport fish in Anna is from 2025.

Yes — Anna has confirmed starry stonewort and zebra mussel. Clean, drain, and dry your equipment to avoid spreading invasives to other waters.