Port Perry Lake is a 187-acre cold, clear oligotrophic lake in Perry County, Missouri. Water quality is graded A based on 3 sampling years through 2024. Compared to the 2 other monitored lakes in Perry County, Port Perry Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 12 ft. Phosphorus level: 8.3 µg/L. Chlorophyll-a: 2.1 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | B |
| Phosphorus | 8.3 µg/L | A |
| Chlorophyll-a (Algae) | 2.1 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 187 acres |
Where to stay near Port Perry Lake
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Fishing Port Perry Lake
Location
County Ranking
Ranked #1 of 3 lakes in Perry County
Nearby Lakes in Perry County
Explore Port Perry Lake across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
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Other Grade A Lakes in Missouri
Ste. Genevieve County · Clarity: 9.9 ft
St. Francois County · Clarity: 14.3 ft
St. Francois County · Clarity: 14.1 ft
St. Francois County · Clarity: 16.3 ft
Washington County · Clarity: 11.1 ft
Jefferson County · Clarity: 12.9 ft
Oligotrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Port Perry Lake is a man-made reservoir impounded by the Port Perry Dam (completed 1973), built primarily for recreation on the TR NATIONS CREEK; earth-type dam, 70 ft tall and 900 ft long.
- Surface area
- 187 ac
- Normal storage
- 828 ac-ft
- Max storage
- 6,506 ac-ft
- Drainage area
- 3.11 sq mi
- Hazard class
- High
Source: USACE National Inventory of Dams, NID ID MO30030 · Operator website
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Port Perry Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Port Perry Service CoPerryville · 0.1 mi away · NPDES MO0116998Recent violation
- Confluence Rivers - Port Perry WwtfPerryville · 0.1 mi away · NPDES MO0139611Recent violation
- Sugar Camp Energy LlcJohnston City · 4.4 mi away · NPDES IL0079472
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: 2024-09-17
Monitoring stations: 1