Lost Lake is a productive, nutrient-rich eutrophic lake in Marshall County, Indiana. Water quality is graded D based on 1 sampling years through 2022. Water clarity is improving over recent sampling years. The lake supports 8 documented fish species including Bluegill, Catfish, and Crappie. Public access is available with 1 public boat landing. Compared to the 2 other monitored lakes in Marshall County, Lost Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Indiana DNR, last sampled 2022-07-10. Grade methodology: LakeGrade methodology.
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Lost Lake Water Quality Report Card (2026)
A printable one-page report card for Lost Lake: grade, clarity, phosphorus, algae, multi-year trend, depth, and fish — with sources.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.9 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lost Lake
Compare lakeside cabins, hotels, and vacation rentals near Lost Lake in Marshall County, Indiana — 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.
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lost Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.441 m/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.1 µg/L/yr | 5 |
Recreation & Access
Current Conditions
Latest reading Jul 6, 2026, 4:00 AM from USGS gauge 03331440. See live data ↗ — readings update every 15–60 minutes; this page refreshes on each build.
Location
County Ranking
Ranked #3 of 3 lakes in Marshall County
Nearby Lakes in Marshall County
Explore Lost Lake across LakeGrade
More Indiana Lake Rankings
Other Grade D Lakes in Indiana
Eutrophic Lakes in Indiana
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
15 EPA-permitted facilities 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.
- Culver Wastewater Treatment PlantCulver · 0.4 mi away · NPDES IN0021288Recent violation
- Culver Community School Bus GaCulver · 1 mi away · NPDES IN0053767
- Chippers Pond DredgingCulver · 1.3 mi away · NPDES INR10L164
- Culver Lake Max Trail Phase IiCulver · 1.3 mi away · NPDES INRA07101
- East Lakeshore Drive Drainage ImprovementsCulver · 1.7 mi away · NPDES INR10L065
- Hart LodgeCulver · 1.7 mi away · NPDES INR10K932
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2022-07-10
Monitoring stations: 1