Lake Anna is a lake in Florence County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.

How deep is Lake Anna?

Lake Anna has a maximum depth of 61 feet. The lake covers 33 acres.

What fish are in Lake Anna?

Fish species found in Lake Anna include Panfish, Largemouth Bass, Trout. Lake Anna is located in Florence County, Wisconsin.

Can I fish at Lake Anna?

Public access to Lake Anna is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

Lake Anna

Florence County, Wisconsin33 acresView map Directions

Wisconsin DNR publishes the water-quality measurements for Lake Anna. Here is what has been measured.

Clarity

20.5 ft

Clearer than most

Secchi · sampled 2023

Max depth

61 ft

Bathymetric survey

Area

33 acres

Surface area

61 ft max depth
Public access
Limited data

See the measurements Directions Where to stay

Lake Anna in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 20.5 ft visibility. Maximum depth: 61 ft. Surface area: 33 acres.

Wisconsin DNR lists Largemouth Bass as common on Lake Anna. DNR survey details →

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Lake Anna is a 33-acre lake in Florence County, Wisconsin with a maximum depth of 61 feet. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Trout. Public access is available.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-06-30. Methodology: how these readings are compared.

What Lake Anna is good for

From access and monitoring records, not editorial picks.

Clear water20.5 ft of visibility
Fishing3 species recorded
Deep water61 ft surveyed max depth

Swimming conditions

No reading

Limited data

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Lake Anna is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Compare swimming lakes near Eagle River →

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Water quality measurements for Lake Anna

These are the measurements Wisconsin DNR publishes for Lake Anna, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

Crystal clear, you can see 20.5 ft down. TSI 34.

Water quality readings
Measure	Reading	Where it sits
Water clarity (Secchi depth)	20.5ft	Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer.
Total phosphorus		No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential.
Chlorophyll-a (algae)		No reading The green pigment in algae — a direct measure of how much algae is in the water.
Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a.	34	Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic

Low nutrients, clear water. No reading is a swimming clearance.

Ask about Lake Anna

Answers come straight from the public measurements and survey records on this page.

DNR fisheries survey

Wisconsin DNR lists Largemouth Bass as common on Lake Anna.

A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Anna’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2023).

Fish Species (DNR-rated)

Largemouth Bass(Common)Panfish(Present)Trout(Present)

Full WI DNR LakePage →Water quality stations →

Lake Details

Max depth

61 ft

Surface area

33 acres

Public access

Yes

Listed by Wisconsin DNR

Lake Size & Watershed

Watershed (drainage) area

0 sq mi

HydroLAKES / HydroSHEDS

Shoreline

0.9 mi

HydroLAKES / HydroSHEDS

Elevation

1,161 ft

Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).

Stays via Stay22

Stays near Lake Anna

Compare lakeside cabins, hotels, and vacation rentals near Lake Anna in Florence County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.

Top-rated places to stay near Lake Anna

Prices for Oct 9–11, 4 adults. Change dates on the map below.

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Follow Lake Anna’s readings

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Fish Species

Panfish Largemouth Bass Trout

Click a species to see every lake where it is documented.

Fishing Lake Anna

Water quality readings over time

3 seasons of samples on record (2022–2025). Calling a direction takes at least 4 years of the same measurement.

Water clarity
Worsening
3 years

Nearby Lakes in Florence County

Cosgrove Lake9.4 ft clear—View →Little Cosgrove Lake8.6 ft clear—View →Cosgrove Lake—View →West Lake -Spread Eagle Chain9.5 ft clear—View →West Lake12 ft clear—View →Middle Lake -Spread Eagle Chain14.4 ft clear—View →

Frequently asked questions about Lake Anna

Where is Lake Anna?: Lake Anna is a lake in Florence County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Lake Anna?: Lake Anna in Florence County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 20.5 ft visibility. Maximum depth: 61 ft. Surface area: 33 acres.
Is Lake Anna safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lake Anna?: Lake Anna has a maximum depth of 61 feet. The lake covers 33 acres.
What fish are in Lake Anna?: Fish species found in Lake Anna include Panfish, Largemouth Bass, Trout. Lake Anna is located in Florence County, Wisconsin.
What did the DNR fisheries survey find at Lake Anna?: Wisconsin DNR lists Largemouth Bass as common on Lake Anna. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lake Anna’s water-quality measurements separately, and the water-quality trend over 3 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Can I fish at Lake Anna?: Public access to Lake Anna is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.

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Where this data comes from

1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.

Collected and reported by

Wisconsin Department of Natural ResourcesWIDNR_WQX1 sample · 2023

Monitoring station identifiers (1)

WIDNR_WQX-193028

EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.