Marshall County Lake Quality
Indiana, 12 lakes — no lake here has enough monitoring data for a grade
Marshall County has 12 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. No lake in Marshall County has enough sampling behind it for an A–F grade yet. The 12 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
Most of the county's monitored lakes are shallow, under 50 feet, which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed.
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Quick Answers for Marshall County
Planning a trip? Check special fishing regulations for Lost Lake — or check the official Indiana fishing regulations.
All Lakes in Marshall County
12 lakes · 0 graded, 12 not rated0 graded lakes · 12 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRLost LakeMarshall | NR | 4.9 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLake of the WoodMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRPretty LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRZehner MillpondMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRHolem LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRMyers LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRDixon LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLawrence LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRLake MaxinkuckeeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake Latonka DamMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRGilbert LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRFlat LakeMarshall | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Indiana
See how Marshall County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.