Shelbyville Lake
Shelby County, WisconsinHypereutrophic
Shelbyville Lake is a 30-acre highly nutrient-loaded hypereutrophic lake in Shelby County, MO. Water quality is graded F based on 3 sampling years through 2023. Compared to the 1 other monitored lakes in Shelby County, Shelbyville Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-08-02. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1 ft of visibility. Phosphorus level: 252.5 µg/L. Chlorophyll-a: 112.4 µg/L. Trophic State Index: 80.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | F |
| Phosphorus | 252.5 µg/L | F |
| Chlorophyll-a (Algae) | 112.4 µg/L | F |
| Trophic State Index (TSI) | 80 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 30 acres |
Location
County Ranking
Ranked #2 of 2 lakes in Shelby County
Cleaner Lakes Within 30 Miles
Shelbyville Lake holds Grade F. 5 nearby lakes hold higher grades.
- CMark Twain LakeMonroe County · 25.7 mi · Two grade letters higher (F → C)
- CMark Twain Lake Indian Creek ArmRalls County · 26.4 mi · Two grade letters higher (F → C)
- DHunnewell LakeShelby County · 12.2 mi · Higher grade (F → D)
- DLong Branch Lk. LakeMacon County · 24.8 mi · Higher grade (F → D)
- DHenry Sever LakeKnox County · 14.3 mi · Higher grade (F → D)
Nearby Lakes in Shelby County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
St. Louis County · Clarity: 1.6 ft
Jackson County · Clarity: 2 ft
St. Charles County · Clarity: 2.3 ft
St. Francois County · Clarity: 1.1 ft
Saline County · Clarity: 2.3 ft
Polk County · Clarity: 1.2 ft
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Shelbyville Lake is a man-made reservoir impounded by the Shelbyville Lake Dam (completed 1956), built primarily for recreation on the TR-BLACK CREEK; earth-type dam, 16 ft tall.
- Surface area
- 30 ac
- Normal storage
- 97 ac-ft
- Max storage
- 257 ac-ft
- Drainage area
- 1,158 sq mi
- Hazard class
- High
- Owner
- CITY OF SHELBYVILLE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO10028 · Operator website
EPA Impairment Status
Shelbyville 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_7036.00 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-08-02
Monitoring stations: 1