Lake Konstanz
Warren County, Missouri19 acresView mapDirections
Missouri DNR publishes the water-quality measurements for Lake Konstanz. Here is what has been measured.
- Oligotrophic
Lake Konstanz in Warren County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 7.7 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 19 acres.
Lake Konstanz is a 19-acre cold, clear oligotrophic lake in Warren County, Missouri. Overall water quality is improving over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Lake Konstanz ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-19. 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 Lake Konstanz 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 Lake Konstanz
These are the measurements Missouri DNR publishes for Lake Konstanz, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.7 ft. Phosphorus 7 µg/L. Chlorophyll-a 1.6 µg/L. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 7µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.6µg/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. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Lake Konstanz
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Lake Konstanz typically sits around 78°F at the surface in September. Summer average is about 82°F. Usually warmest in Jul (about 85°F) and coldest in Apr (about 63°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (63°F) to its warmest (85°F).
Typical surface water temperature by month, from 148 field readings (2010–2024) via the EPA Water Quality Portal. See the full Lake Konstanz water temperature breakdown →
Lake Details
Surface area
19 acres
No bathymetric survey has been published for Lake Konstanz, so its depth is not documented here.
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Stays near Lake Konstanz
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Fishing Lake Konstanz
Water Quality Trend: Improving
Based on 4 years of monitoring (2020–2024).
Water clarity
Improving4 years
Phosphorus
Improving-1.17 µg/L/yr4 years
Chlorophyll-a
Improving-0.27 µg/L/yr4 years
Reservoir Info (USACE NID)
Lake Konstanz is a man-made reservoir impounded by the Lake Konstanz Dam (completed 1999) on the TRIB. CHARRETTE CREEK; earth-type dam, 90 ft tall and 525 ft long.
- Surface area
- 19 ac
- Normal storage
- 86 ac-ft
- Max storage
- 103 ac-ft
- Drainage area
- 0.14 sq mi
- Hazard class
- High
- Owner
- INNSBROOK CORPORATION
Source: USACE National Inventory of Dams, NID ID MO32048 · Operator website
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Lake Konstanz under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Dogwood Lake CampgroundWarrenton · 3.8 mi away · NPDES MO0085863Recent violation
- Oak Grove MhpWarrenton · 4.3 mi away · NPDES MO0088111Recent violation
- Oak Ridge Estates WwtfWarrenton · 4.7 mi away · NPDES MO0123391Recent violation
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.
Nearby Lakes in Warren County
Frequently asked questions about Lake Konstanz
Where is Lake Konstanz?
- Lake Konstanz 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 Lake Konstanz?
- Lake Konstanz in Warren County, Missouri has water-quality measurements published by Missouri DNR, shown here as reported. Water clarity: 7.7 ft visibility. Phosphorus: 7 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 19 acres.
Is Lake Konstanz 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 Lake Konstanz?
- Lake Konstanz typically sits around 78°F at the surface in September, from 148 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
Explore Lake Konstanz across LakeQuality
More lakes in Missouri
Other Lakes in Missouri
Oligotrophic Lakes in Missouri
Where this data comes from
66 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
UMC66 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.
Other records on this page
Regulated discharger data from EPA ECHO (ICIS-NPDES)