Castlenovo Lake
Warren County, Missouri10 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- #5 of 16 in the county
Castlenovo Lake in Warren County, Missouri has a water quality grade of A (Excellent). Water clarity: 6 ft visibility. Phosphorus: 16.8 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 10 acres.
- Clarity
- 6 ft
- Typical in September
- 78°F
- Area
- 10 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
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Watch Castlenovo Lake’s letter
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Castlenovo Lake is a 10-acre mesotrophic lake in Warren County, Missouri. Water quality is graded A based on 2 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 #5 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-21. 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 6 ft. Phosphorus 16.8 µg/L. Chlorophyll-a 2.9 µg/L. TSI 46. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | Not graded |
| Phosphorus | 16.8 µg/L | Good |
| Chlorophyll-a (Algae) | 2.9 µg/L | Good |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Castlenovo Lake typically sits around 78°F at the surface in September. Summer average is about 83°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 10 acres |
No bathymetric survey has been published for Castlenovo Lake, so its depth is not documented here.
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 |
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)
County Ranking
Ranked #5 of 16 lakes in Warren County
Nearby Lakes in Warren County
Frequently asked questions about Castlenovo Lake
Where is Castlenovo Lake?
- Castlenovo Lake is a lake in Warren County, Missouri. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Castlenovo Lake?
- Castlenovo Lake in Warren County, Missouri has a water quality grade of A (Excellent). Water clarity: 6 ft visibility. Phosphorus: 16.8 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 10 acres.
Is Castlenovo 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 Castlenovo Lake?
- Castlenovo Lake typically sits around 78°F at the surface in September, from 102 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Castlenovo Lake across LakeQuality
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
Mesotrophic Lakes in Missouri
Where this data comes from
113 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
UMC113 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.