Castlenovo Lake is a 10-acre mesotrophic lake in Warren County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Castlenovo Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-21. Grade methodology: LakeGrade methodology.
Watch Castlenovo Lake water quality
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 6 ft. Phosphorus level: 16.8 µg/L. Chlorophyll-a: 2.9 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | D |
| Phosphorus | 16.8 µg/L | A |
| Chlorophyll-a (Algae) | 2.9 µg/L | A |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 10 acres |
Where to stay near Castlenovo Lake
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Fishing Castlenovo Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.031 m/yr | 5 |
| Phosphorus | ↓ Declining | +0.72 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.27 µg/L/yr | 5 |
Water Temperature
Castlenovo Lake averages about 83°F at the surface in summer, usually warmest in Jul (about 85°F) and coldest in Apr (about 64°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 102 field readings (2010–2024) via the EPA Water Quality Portal. See the full Castlenovo Lake water temperature breakdown →
Location
County Ranking
Ranked #4 of 16 lakes in Warren County
Cleaner Lakes Within 30 Miles
Castlenovo Lake holds Grade B. 2 nearby lakes hold higher grades.
- AAlpine LakeWarren County · 2 mi · Higher grade (B → A)
- BLake KonstanzWarren County · 1.3 mi · Higher overall water quality score
Nearby Lakes in Warren County
Explore Castlenovo Lake across LakeGrade
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Mesotrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Castlenovo Lake is a man-made reservoir impounded by the Castelenovo Lake Dam (completed 1976), built primarily for recreation on the TR CHARRETTE CREEK; earth-type dam, 37 ft tall and 310 ft long.
- Surface area
- 10 ac
- Normal storage
- 109 ac-ft
- Max storage
- 160 ac-ft
- Drainage area
- 0.2 sq mi
- Hazard class
- High
Source: USACE National Inventory of Dams, NID ID MO30793 · Operator website · Matched by proximity (0.05 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-21
Monitoring stations: 1