Perry City Lake
Ralls County, Missouri16 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Algal growth
- 35 ft max depth
- Public access
- Limited data
Perry City Lake in Ralls County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 240 µg/L. Surface area: 16 acres.
- Typical in August
- 79°F
- Max depth
- ~35 ft est.
- Area
- 16 acres
- Phosphorus
- 240 µg/L
- Public access
- Yes
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Watch Perry City Lake’s letter
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Why Perry City Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Perry City Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Missouri DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Perry City Lake is a 16-acre lake in Ralls County, Missouri with an estimated average depth of about 35 feet. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2025-07-28. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Perry City Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water quality measurements for Perry City Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 240 µg/L. TSI 83.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 240 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 83 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Perry City Lake typically sits around 79°F at the surface in August. Summer average is about 83°F. Usually warmest in Jul (about 87°F) and coldest in May (about 76°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 20 field readings (2013–2024) via the EPA Water Quality Portal. See the full Perry City Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~35 ft est. |
| Average Depth | ~9 ft est. |
| Surface Area | 16 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Missouri has not published bathymetry for Perry City Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Perry City Lake
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
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Perry City Lake under Clean Water Act (NPDES) discharge permits. 2 facilities have a reported Clean Water Act violation in the past three years.
- Perry WwtfPerry · 0.9 mi away · NPDES MO0111821Recent violation
- Land 4 Boats WwtfPerry · 2.2 mi away · NPDES MO0123846Recent violation
- Riedel Energy IncPerry · 2.3 mi away · NPDES MO0099848
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.
Graded lakes near Perry City Lake
Perry City Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Ralls County
Frequently asked questions about Perry City Lake
Where is Perry City Lake?
- Perry City Lake is a lake in Ralls County, Missouri. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Perry City Lake?
- Perry City Lake in Ralls County, Missouri is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 240 µg/L. Surface area: 16 acres.
Is Perry City Lake safe to swim in?
- The letter is not a swimming clearance. Perry City Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
What is the water temperature of Perry City Lake?
- Perry City Lake typically sits around 79°F at the surface in August, from 20 EPA Water Quality Portal field readings (2013–2024). That is a typical value for the month, not a live reading.
How deep is Perry City Lake?
- No published bathymetric survey covers Perry City Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 16 acres.
Explore Perry City Lake across LakeQuality
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Where this data comes from
1 measurement from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Missouri Dept. of Natural Resources
MDNR1 sample · 2025
Analytical methods
- Nitrogen and Phosphorus, Total, Whole-water, Alkaline Persulfate Digest
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)