Innsbrook Lake Nr. Dam is a 39-acre mesotrophic lake in Warren County, Missouri. Water quality is graded B based on 3 sampling years through 2024. Water clarity is improving over recent sampling years. Compared to the 15 other monitored lakes in Warren County, Innsbrook Lake Nr. Dam ranks #7 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
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
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 | D |
| Phosphorus | 17 µg/L | A |
| Chlorophyll-a (Algae) | 5 µg/L | B |
| Trophic State Index (TSI) | 48 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 39 acres |
Where to stay near Innsbrook Lake Nr. Dam
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Fishing Innsbrook Lake Nr. Dam
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 |
Water Temperature
Innsbrook Lake Nr. Dam averages about 80°F at the surface in summer, usually warmest in Jul (about 83°F) and coldest in Apr (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 89 field readings (2010–2024) via the EPA Water Quality Portal. See the full Innsbrook Lake Nr. Dam water temperature breakdown →
Location
County Ranking
Ranked #7 of 16 lakes in Warren County
Cleaner Lakes Within 30 Miles
Innsbrook Lake Nr. Dam holds Grade B. 4 nearby lakes hold higher grades.
- AAlpine LakeWarren County · 1.9 mi · Higher grade (B → A)
- BLake KonstanzWarren County · 1.1 mi · Higher overall water quality score
- BCastlenovo LakeWarren County · 0.2 mi · Higher overall water quality score
- BWhippoorwill LakeWarren County · 1.1 mi · Higher overall water quality score
Nearby Lakes in Warren County
Explore Innsbrook Lake Nr. Dam across LakeGrade
More Missouri Lake Rankings
Other Grade B Lakes in Missouri
Mesotrophic Lakes in Missouri
More records, surveys & data sources
Reservoir Info (USACE NID)
Innsbrook Lake Nr. Dam is a man-made reservoir impounded by the Lake Innsbrook Dam (completed 1975), built primarily for recreation on the TRIB CHARRETTE CREEK; earth-type dam, 46 ft tall and 700 ft long.
- Surface area
- 39 ac
- Normal storage
- 532 ac-ft
- Max storage
- 974 ac-ft
- Drainage area
- 3.84 sq mi
- Hazard class
- High
- Owner
- INNSBROOK OWNERS ASSOCIATION
Source: USACE National Inventory of Dams, NID ID MO11243 · Operator website · Matched by proximity (0.06 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-26
Monitoring stations: 1