Lake Konstanz is a 19-acre cold, clear oligotrophic lake in Warren County, Missouri. Water quality is graded B based on 3 sampling years through 2024. 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. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 7.7 ft. Phosphorus level: 7 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.7 ft | C |
| Phosphorus | 7 µg/L | A |
| Chlorophyll-a (Algae) | 1.6 µg/L | A |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 19 acres |
Where to stay near Lake Konstanz
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Fishing Lake Konstanz
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.254 m/yr | 4 |
| Phosphorus | ↑ Improving | -1.17 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.27 µg/L/yr | 4 |
Water Temperature
Lake Konstanz averages about 82°F at the surface in summer, usually warmest in Jul (about 85°F) and coldest in Apr (about 63°F). These are typical values by month — not a live reading.
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 →
Location
County Ranking
Ranked #2 of 16 lakes in Warren County
Cleaner Lakes Within 30 Miles
Lake Konstanz holds Grade B. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Warren County
Explore Lake Konstanz across LakeGrade
Species activity outlook by water temperature and season
Where to stay at Missouri's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
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More records, surveys & data sources
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-19
Monitoring stations: 1