Warren County, Missouri · Water Quality Report Card
Innsbrook Lake
Innsbrook Lake in Warren County, Missouri has a water quality grade of A (Excellent). Water clarity: 5.2 ft visibility. Phosphorus: 17 µg/L. Chlorophyll-a (algae): 5 µg/L.
- Clarity
- 5.2 ft
- Mean depth
- ~18 ft est.
- Type
- Mesotrophic
- Trend
- → Stable
Innsbrook Lake is a mesotrophic lake in Warren County, Missouri with an estimated average depth of about 18 feet. Water quality is graded A based on 2 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Innsbrook Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Missouri DNR, last sampled 2024-09-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Murky, only visible to about 5.2 ft. Phosphorus level: 17 µg/L. Chlorophyll-a: 5 µg/L. Trophic State Index: 48.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.2 ft | |
| Phosphorus | 17 µg/L | Good |
| Chlorophyll-a (Algae) | 5 µg/L | Good |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~18 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Missouri has not published bathymetry for Innsbrook Lake.
Where to stay near Innsbrook Lake
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Fishing Innsbrook Lake
Water Quality Trend: → Stable
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.062 m/yr | 5 |
| Phosphorus | → Stable | -0.18 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.07 µg/L/yr | 5 |
Location
County Ranking
Ranked #3 of 16 lakes in Warren County
Nearby Lakes in Warren County
Explore Innsbrook Lake across LakeGrade
More Missouri Lake Rankings
Other Grade A Lakes in Missouri
Mesotrophic Lakes in Missouri
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
76 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
UMC76 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 come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2024-09-26
Monitoring stations: 1