Loto Lake is a mesotrophic lake in Morgan County, Missouri. Water quality is graded B based on 3 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 37 other monitored lakes in Morgan County, Loto Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2023-06-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 18 µg/L. Chlorophyll-a: 8.2 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | C |
| Phosphorus | 18 µg/L | A |
| Chlorophyll-a (Algae) | 8.2 µg/L | B |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Loto Lake
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Fishing Loto Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.065 m/yr | 5 |
| Phosphorus | ↑ Improving | -2.46 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.57 µg/L/yr | 5 |
Location
County Ranking
Ranked #5 of 38 lakes in Morgan County
Nearby Lakes in Morgan County
Explore Loto Lake across LakeGrade
Species activity outlook by water temperature and season
Top lakes and where to stay in the Lake of the Ozarks area
Where to stay at Missouri's top lakes, each with its grade
Moderate nutrients, good water quality
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
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
4 EPA-permitted facilities operate within about 5 miles of Loto Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Johnson BayLaurie · 0.2 mi away · NPDES MO0122203Recent violation
- Gentle Slopes Subdivision WwtfGravois Mills · 0.3 mi away · NPDES MO0124249
- La Pergola WwtfLaurie · 0.5 mi away · NPDES MO0132462
- Sheldon Point SubdivisionGravois Mills · 0.5 mi away · NPDES MO0120952
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
Most recent sample: 2023-06-15
Monitoring stations: 1