Port Perry Lake South Arm is a 187-acre cold, clear oligotrophic lake in Perry County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Compared to the 2 other monitored lakes in Perry County, Port Perry Lake South Arm ranks #2 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
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 9.5 ft. Phosphorus level: 8.3 µg/L. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | 8.3 µg/L | A |
| Chlorophyll-a (Algae) | 2.3 µg/L | A |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 187 acres |
Where to stay near Port Perry Lake South Arm
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Fishing Port Perry Lake South Arm
Location
County Ranking
Ranked #2 of 3 lakes in Perry County
Cleaner Lakes Within 30 Miles
Port Perry Lake South Arm holds Grade B. 2 nearby lakes hold higher grades.
- APort Perry LakePerry County · 0.4 mi · Higher grade (B → A)
- AGoose Creek LakeSte. Genevieve County · 26.3 mi · Higher grade (B → A)
Nearby Lakes in Perry County
Explore Port Perry Lake South Arm 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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Reservoir Info (USACE NID)
Port Perry Lake South Arm 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 · Matched by proximity (0.73 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-17
Monitoring stations: 1