Lake Anna
Lake Anna in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 20.5 ft visibility. Maximum depth: 61 ft. Surface area: 33 acres.
- Clarity
- 20.5 ft
- Max depth
- 61 ft
- Area
- 33 acres
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Florence County
Why Lake Anna has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Anna, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Anna
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Crystal clear, you can see 20.5 ft down. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 20.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay 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
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 61 ft |
| Surface Area | 33 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Anna
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2023).
Fish Species (DNR-rated)
Water Quality Trend: ↓ Declining
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.251 m/yr | 3 |
Graded lakes near Lake Anna
Lake Anna has no grade, but these lakes within a short drive do.
Nearby Lakes in Florence County
Frequently asked questions about Lake Anna
What is the water quality grade for Lake Anna?
- Lake Anna in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 20.5 ft visibility. Maximum depth: 61 ft. Surface area: 33 acres.
Is Lake Anna safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Anna is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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.
Explore Lake Anna across LakeGrade
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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 Resources
WIDNR_WQX1 sample · 2023
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes