Lost Lake
Sawyer County, Wisconsin51 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Lost Lake. Here is what has been measured.
- Mesotrophic
- 13 ft max depth
Lost Lake in Sawyer County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.6 ft visibility. Phosphorus: 19.5 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Maximum depth: 13 ft. Surface area: 51 acres.
Wisconsin DNR lists Panfish as common on Lost Lake. DNR survey details →
Lost Lake is a 51-acre mesotrophic lake in Sawyer County, Wisconsin with a maximum depth of 13 feet. Overall water quality is declining over recent sampling years. The lake supports 2 documented fish species including Panfish and Largemouth Bass. Compared to the 44 other monitored lakes in Sawyer County, Lost Lake ranks #13 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-07-16. Methodology: how these readings are compared.
What Lost Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.6 ft of visibility
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lost Lake 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.
Water quality measurements for Lost Lake
These are the measurements Wisconsin DNR publishes for Lost Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.6 ft. Phosphorus 19.5 µg/L. Chlorophyll-a 1.6 µg/L. TSI 42.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 19.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.6µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 42 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Lost Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Lost Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lost Lake’s water-quality measurements separately, and the water-quality trend over 5 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.
Fish Species (DNR-rated)
Lake Details
Max depth
13 ft
Surface area
51 acres
Lake Size & Watershed
Watershed (drainage) area
0 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.1 mi
HydroLAKES / HydroSHEDS
Elevation
1,309 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Lost Lake
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Top-rated places to stay near Lost Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Lost Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Worsening+1 µg/L/yr5 years
Chlorophyll-a
Worsening+0.1 µg/L/yr5 years
Nearby Lakes in Sawyer County
Frequently asked questions about Lost Lake
Where is Lost Lake?
- Lost Lake is a lake in Sawyer County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Lost Lake?
- Lost Lake in Sawyer County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 10.6 ft visibility. Phosphorus: 19.5 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Maximum depth: 13 ft. Surface area: 51 acres.
Is Lost Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Lost Lake?
- Lost Lake has a maximum depth of 13 feet. The lake covers 51 acres.
What fish are in Lost Lake?
- Fish species found in Lost Lake include Panfish, Largemouth Bass. Lost Lake is located in Sawyer County, Wisconsin.
What did the DNR fisheries survey find at Lost Lake?
- Wisconsin DNR lists Panfish as common on Lost Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Lost Lake’s water-quality measurements separately, and the water-quality trend over 5 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
Explore Lost Lake across LakeQuality
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Where this data comes from
32 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Lac Courte Oreilles (Tribal)
LCOWIS_WQX32 samples · 2021–2024
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 4500 P F ~ Phosphorus in Water by Colorimetry Automated Ascorbic Acid Method
- 4500 P E ~ Phosphorus by Ascorbic Acid
- 10200 H ~ Chlorophyll a-b-c Determination
Monitoring station identifiers (1)
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.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes