Lost Lake
Lost Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 13.3 µg/L. Maximum depth: 18 ft. Surface area: 41 acres.
Wisconsin DNR lists Largemouth Bass as present on Lost Lake. DNR survey details →
- Max depth
- 18 ft
- Area
- 41 acres
- Public access
- Yes
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Why Lost Lake has no grade
We grade a lake only when the monitoring record supports a letter: 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 Lost Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity 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.
Lost Lake is a 41-acre lake in Marinette County, Wisconsin with a maximum depth of 18 feet. The lake supports 1 documented fish species including Largemouth Bass. Public access is available with 3 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-08-02. Grade methodology: LakeQuality 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 Lost Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus level: 13.3 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 13.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lost Lake
Compare lakeside cabins, hotels, and vacation rentals near Lost Lake in Marinette 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 Lost Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Wisconsin DNR lists Largemouth Bass as present on Lost Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lost Lake — official chemistry is on file, not a letter. 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 2022).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 18 ft |
| Surface Area | 41 acres |
| Public Access | Yes |
Recreation & Access
- Wolf LakePublic
- Lost LakePublic
- Long LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lost Lake
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Lost Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Wausaukee Wastewater Treatment FacilityWausaukee · 1.9 mi away · NPDES WI0060011Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near Lost Lake
Lost Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marinette County
Frequently asked questions about Lost Lake
Where is Lost Lake?
- Lost Lake is a lake in Marinette County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Lost Lake?
- Lost Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 13.3 µg/L. Maximum depth: 18 ft. Surface area: 41 acres.
Is Lost Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lost Lake 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 Lost Lake?
- Lost Lake has a maximum depth of 18 feet. The lake covers 41 acres.
What fish are in Lost Lake?
- Fish species found in Lost Lake include Largemouth Bass. Lost Lake is located in Marinette County, Wisconsin.
What did the DNR fisheries survey find at Lost Lake?
- Wisconsin DNR lists Largemouth Bass as present on Lost Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Lost Lake — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Lost Lake?
- Lost Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Wolf Lake, Lost Lake, Long Lake. Public access is listed as yes.
Explore Lost Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2022
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory