Lewis Lake is a 6-acre highly nutrient-loaded hypereutrophic lake in Stoddard County, Missouri. Water quality is graded F based on 2 sampling years through 2021.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2021-07-07. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 101 µg/L. Chlorophyll-a: 149.8 µg/L. Trophic State Index: 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 101 µg/L | F |
| Chlorophyll-a (Algae) | 149.8 µg/L | F |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 6 acres |
Where to stay near Lewis Lake
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Fishing Lewis Lake
Location
County Ranking
Ranked #1 of 1 lakes in Stoddard County
Cleaner Lakes Within 30 Miles
Lewis Lake holds Grade F. 3 nearby lakes hold higher grades.
- CLake Wappapello Lost Cr. Arm @ Sanderson Pt BottomWayne County · 27.6 mi · Two grade letters higher (F → C)
- DLake Wappapello Nr. DamWayne County · 24.3 mi · Higher grade (F → D)
- DLake Wappapello,Lost Cr. Arm @Sanderson Pt.Wayne County · 27.6 mi · Higher grade (F → D)
Nearby Lakes in Stoddard County
Explore Lewis Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
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Other Grade F Lakes in Missouri
Reynolds County · Clarity: 2.7 ft
St. Francois County · Clarity: 1.1 ft
St. Louis County · Clarity: 0.6 ft
Jefferson County · Clarity: 1.3 ft
St. Louis County · Very Poor
St. Louis County · Clarity: 3.1 ft
Hypereutrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Lewis Lake is a man-made reservoir impounded by the Richards Dam (completed 1995), built primarily for fish and wildlife pond on the TR-WILLIAMS CREEK; earth-type dam, 20 ft tall and 268 ft long.
- Surface area
- 6 ac
- Normal storage
- 61 ac-ft
- Max storage
- 108 ac-ft
- Drainage area
- 57.6 sq mi
- Hazard class
- Low
- Owner
- MIKE RICHARDS
All listed purposes: Fish and Wildlife Pond;Grade Stabilization;Recreation.
Source: USACE National Inventory of Dams, NID ID MO50660 · Operator website · Matched by proximity (0.05 km)
EPA Impairment Status
Lewis Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7346.00 · Official waterbody report
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Lewis Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Semo Residential And Recovery WwtfEssex · 1 mi away · NPDES MO0101176Recent violation
- Nestle Purina Petcare CompanyBloomfield · 3.3 mi away · NPDES MO0101788Recent violation
- Essex Power PlantEssex · 3.3 mi away · NPDES MO0123447
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-07-07
Monitoring stations: 1