Castlenovo Lake
Warren County, Missouri10 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Castlenovo Lake. Here is what has been measured.
- Mesotrophic
Castlenovo Lake in Warren County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 6 ft visibility. Phosphorus: 16.8 µg/L. Chlorophyll-a (algae): 2.9 µg/L. Surface area: 10 acres.
Castlenovo Lake is a 10-acre mesotrophic lake in Warren County, Missouri. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
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 Castlenovo Lake 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 Castlenovo Lake
These are the measurements Missouri DNR publishes for Castlenovo Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6 ft. Phosphorus 16.8 µg/L. Chlorophyll-a 2.9 µg/L. TSI 46.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 16.8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.9µg/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. | 46 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Castlenovo Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (64°F) to its warmest (85°F).
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
Surface area
10 acres
No bathymetric survey has been published for Castlenovo Lake, so its depth is not documented here.
Stays via Stay22
Stays near Castlenovo Lake
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Fishing Castlenovo Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2020–2024).
Water clarity
Stable5 years
Phosphorus
Worsening+0.72 µg/L/yr5 years
Chlorophyll-a
Worsening+0.27 µg/L/yr5 years
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)
Nearby Lakes in Warren County
Frequently asked questions about Castlenovo Lake
Where is Castlenovo Lake?
- Castlenovo Lake is a lake in Warren County, Missouri. Its water-quality measurements are published by Missouri DNR and shown on this page as reported.
What is the water quality of Castlenovo Lake?
- Castlenovo Lake in Warren County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. 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?
- Nutrient and algae readings are 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
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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)
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.