Rock Lake Village Lake
Johnson County, Missouri27 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- #2 of 4 in the county
Rock Lake Village Lake in Johnson County, Missouri has a water quality grade of A (Excellent). Water clarity: 4.3 ft visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 27 acres.
- Clarity
- 4.3 ft
- Typical in September
- 75°F
- Area
- 27 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
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Watch Rock Lake Village Lake’s letter
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Rock Lake Village Lake is a 27-acre mesotrophic lake in Johnson County, Missouri. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 3 other monitored lakes in Johnson County, Rock Lake Village Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-08-27. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Murky, only visible to about 4.3 ft. Phosphorus 16 µg/L. Chlorophyll-a 4.8 µg/L. TSI 49. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | Not graded |
| Phosphorus | 16 µg/L | Good |
| Chlorophyll-a (Algae) | 4.8 µg/L | Good |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Rock Lake Village Lake typically sits around 75°F at the surface in September. Summer average is about 79°F. Usually warmest in Jul (about 82°F) and coldest in Apr (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 27 field readings (2020–2024) via the EPA Water Quality Portal. See the full Rock Lake Village Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 27 acres |
No bathymetric survey has been published for Rock Lake Village Lake, so its depth is not documented here.
Fishing Rock Lake Village Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.022 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.9 µg/L/yr | 5 |
| Chlorophyll-a | ↑ Improving | -0.63 µg/L/yr | 5 |
Reservoir Info (USACE NID)
Rock Lake Village Lake is a man-made reservoir impounded by the Rock Lake Village Dam (completed 2006) on the Trib. Blackwater river; earth-type dam, 66 ft tall and 730 ft long.
- Surface area
- 27 ac
- Normal storage
- 540 ac-ft
- Max storage
- 585 ac-ft
- Drainage area
- 0.11 sq mi
- Hazard class
- High
Source: USACE National Inventory of Dams, NID ID MO40148 · Operator website
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Rock Lake Village Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Republic Foods FacilityLone Jack · 1.9 mi away · NPDES MO0139009Recent violation
- Powell Gardens WwtfsKingsville · 2 mi away · NPDES MO0123501Recent violation
- Shell Xpress Kingsville LlcKingsville · 2.4 mi away · NPDES MO0124729Recent violation
- Powell'S Creekside HavenKingsville · 1.5 mi away · NPDES MO0139840
- Maplewood Estates WwtfHolden · 4.9 mi away · NPDES MO0127167
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.
County Ranking
Ranked #2 of 4 lakes in Johnson County
Nearby Lakes in Johnson County
Frequently asked questions about Rock Lake Village Lake
Where is Rock Lake Village Lake?
- Rock Lake Village Lake is a lake in Johnson County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rock Lake Village Lake?
- Rock Lake Village Lake in Johnson County, Missouri has a water quality grade of A (Excellent). Water clarity: 4.3 ft visibility. Phosphorus: 16 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 27 acres.
Is Rock Lake Village Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Rock Lake Village Lake?
- Rock Lake Village Lake typically sits around 75°F at the surface in September, from 27 EPA Water Quality Portal field readings (2020–2024). That is a typical value for the month, not a live reading.
Explore Rock Lake Village Lake across LakeQuality
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
Mesotrophic Lakes in Missouri
Where this data comes from
80 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Univ. of Missouri, Columbia
UMC80 samples · 2020–2024
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)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)