W Arm Loto Lake is a productive, nutrient-rich eutrophic lake in Camden County, Missouri. Water quality is graded D based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Public access is available with 2 public boat landings. Compared to the 41 other monitored lakes in Camden County, W Arm Loto Lake ranks #42 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-17. Grade methodology: LakeGrade methodology.
Watch W Arm Loto Lake water quality
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 2.7 ft of visibility. Phosphorus level: 67 µg/L. Chlorophyll-a: 23 µg/L. Trophic State Index: 63.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.7 ft | F |
| Phosphorus | 67 µg/L | D |
| Chlorophyll-a (Algae) | 23 µg/L | D |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near W Arm Loto Lake
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Fishing W Arm Loto Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.019 m/yr | 5 |
| Phosphorus | ↓ Declining | +5.86 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.96 µg/L/yr | 5 |
Recreation & Access
Water Temperature
W Arm Loto Lake averages about 84°F at the surface in summer, usually warmest in Aug (about 86°F) and coldest in Apr (about 61°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 71 field readings (2010–2024) via the EPA Water Quality Portal. See the full W Arm Loto Lake water temperature breakdown →
Location
County Ranking
Ranked #42 of 42 lakes in Camden County
Cleaner Lakes Within 30 Miles
W Arm Loto Lake holds Grade D. 2 nearby lakes hold higher grades.
- CLoto LakeMorgan County · 10.4 mi · Higher grade (D → C)
- DLoto LakeMorgan County · 2.8 mi · Higher overall water quality score
Nearby Lakes in Camden County
Explore W Arm 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
High nutrients, frequent algae, reduced clarity
Missouri's cleanest and most-polluted lakes, ranked
More Missouri Lake Rankings
Other Grade D 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
24 EPA-permitted facilities operate within about 5 miles of W Arm Loto Lake under Clean Water Act (NPDES) discharge permits. 10 facilities have a reported Clean Water Act violation in the past three years.
- Shimmering ShoresGravois Mills · 0.5 mi away · NPDES MO0130346Recent violation
- Ivy Bend Resort And MarinaStover · 1.2 mi away · NPDES MO0130605Recent violation
- Klein LemonGravois Mills · 1.4 mi away · NPDES MO0137391Recent violation
- Moonies Resort WwtfClimax Springs · 1.5 mi away · NPDES MO0140252Recent violation
- Admiral'S Point SubdivisionClimax Springs · 2.3 mi away · NPDES MO0124354Recent violation
- Lake Home Neighbor'S WwtfStover · 3.4 mi away · NPDES MO0124001Recent 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.
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: 2024-09-17
Monitoring stations: 1