Port Perry Lake South Arm
Perry County, Missouri187 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Port Perry Lake South Arm. Here is what has been measured.
- Mesotrophic
- Limited data
Port Perry Lake South Arm in Perry County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 8.3 µg/L. Chlorophyll-a (algae): 2.3 µg/L. Surface area: 187 acres.
Port Perry Lake South Arm is a 187-acre mesotrophic lake in Perry County, Missouri. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Port Perry Lake South Arm is safe to swim in today is a call for the Missouri Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Port Perry Lake South Arm
These are the measurements Missouri DNR publishes for Port Perry Lake South Arm, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9.5 ft. Phosphorus 8.3 µg/L. Chlorophyll-a 2.3 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 8.3µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.3µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 39 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Port Perry Lake South Arm
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
187 acres
No bathymetric survey has been published for Port Perry Lake South Arm, so its depth is not documented here.
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Fishing Port Perry Lake South Arm
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)
Nearby Lakes in Perry County
Frequently asked questions about Port Perry Lake South Arm
Where is Port Perry Lake South Arm?
- Port Perry Lake South Arm is a lake in Perry County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Port Perry Lake South Arm?
- Port Perry Lake South Arm in Perry County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 9.5 ft visibility. Phosphorus: 8.3 µg/L. Chlorophyll-a (algae): 2.3 µg/L. Surface area: 187 acres.
Is Port Perry Lake South Arm safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
21 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC21 samples · 2024
Analytical methods
- Depth, Secchi disk in meters
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.