Lost Lake
Marshall County, IndianaView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Common Carp
- 26 ft max depth
- Public access
- Limited data
Lost Lake in Marshall County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.9 ft visibility.
- Clarity
- 4.9 ft
- Max depth
- ~26 ft est.
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Lost Lake’s letter
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Why Lost Lake has no grade
Lost Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Lost Lake is Not Rated — not an F. Its 4.9-foot median from 3 readings collected 2020–2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by IDEM and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lost Lake is a lake in Marshall County, Indiana with an estimated average depth of about 26 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEM, last sampled 2022-07-10. Grade methodology: LakeQuality methodology.
What Lost Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lost Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.9 ft. TSI 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Current Conditions
USGS snapshot Jul 6, 2026, 4:00 AM from gauge 03331440 (Lake Maxinkuckee at Culver, IN). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~26 ft est. |
| Average Depth | ~9 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Indiana has not published bathymetry for Lost Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Tri-County Fish & Wildlife AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.441 m/yr | 5 |
| Phosphorus | ↓ Declining | +5.5 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.1 µg/L/yr | 5 |
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.
Nearby Lakes in Marshall County
Frequently asked questions about Lost Lake
Where is Lost Lake?
- Lost Lake is a lake in Marshall County, Indiana. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Lost Lake?
- Lost Lake in Marshall County, Indiana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.9 ft visibility.
Is Lost Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Lost Lake?
- No published bathymetric survey covers Lost Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 26 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
What is the water level at Lost Lake?
- The USGS snapshot on this page for Lost Lake is 3.66 ft of gage height, recorded Jul 6, 2026, 4:00 AM at gauge 03331440. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Are there boat ramps on Lost Lake?
- Lost Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Tri-County Fish & Wildlife Area. Public access is listed as yes.
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Where this data comes from
3 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS3 samples · 2020–2022
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)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory