Perry City Lake
Ralls County, WisconsinLimited DataHypereutrophic
Perry City Lake is a 16-acre highly nutrient-loaded hypereutrophic lake in Ralls County, MO. Water quality is graded F based on 1 sampling years through 2025. Compared to the 3 other monitored lakes in Ralls County, Perry City Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-07-28. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
No clarity data. Phosphorus level: 240 µg/L. Trophic State Index: 83.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 240 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 83 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 16 acres |
Location
County Ranking
Ranked #4 of 4 lakes in Ralls County
Cleaner Lakes Within 30 Miles
Perry City Lake holds Grade F. 5 nearby lakes hold higher grades.
- AOasis Ranch LakeAudrain County · 16.1 mi · Two grade letters higher (F → A)
- CMark Twain Lake by Hwy JRalls County · 6.9 mi · Two grade letters higher (F → C)
- CMark Twain LakeMonroe County · 7.6 mi · Two grade letters higher (F → C)
- CMark Twain Lake Indian Creek ArmRalls County · 8.1 mi · Two grade letters higher (F → C)
- DMark Twain LakeRalls County · 7.1 mi · Higher grade (F → D)
Nearby Lakes in Ralls 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)
Perry City Lake is a man-made reservoir impounded by the Perry City Dam - Lower (completed 1964), built primarily for water supply on the MACE BRANCH LICK CREEK; earth-type dam, 26 ft tall.
- Surface area
- 16 ac
- Normal storage
- 61 ac-ft
- Max storage
- 223 ac-ft
- Drainage area
- 1,583 sq mi
- Hazard class
- High
- Owner
- CITY OF PERRY
Source: USACE National Inventory of Dams, NID ID MO10675 · Operator website · Matched by proximity (0.11 km)
EPA Impairment Status
Perry City 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_7047.00 · 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: 2025-07-28
Monitoring stations: 1