Lambach Lake is a 9-acre mesotrophic lake in Scott County, Iowa. Water quality is graded B based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Scott County, Lambach Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-10. 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 7.9 ft. Chlorophyll-a: 5.1 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.9 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 5.1 µg/L | B |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 9 acres |
Where to stay near Lambach Lake
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Fishing Lambach Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.415 m/yr | 4 |
| Chlorophyll-a | ↑ Improving | -51.81 µg/L/yr | 4 |
Location & Depth Map
Free interactive depth-contour map of Lambach Lake, reaching a maximum surveyed depth of 16 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Iowa DNR.
County Ranking
Ranked #1 of 5 lakes in Scott County
Nearby Lakes in Scott County
Explore Lambach Lake across LakeGrade
More Iowa Lake Rankings
Other Grade B Lakes in Iowa
Mesotrophic Lakes in Iowa
More records, surveys & data sources
Reservoir Info (USACE NID)
Lambach Lake is a man-made reservoir impounded by the Northeast Lake Dam (completed 1972), built primarily for recreation on the BLACKHAWK CREEK; earth-type dam, 26 ft tall and 400 ft long.
- Surface area
- 9 ac
- Normal storage
- 75 ac-ft
- Max storage
- 160 ac-ft
- Drainage area
- 0.2 sq mi
- Hazard class
- Low
- Owner
- Scott County Conservation Board
All listed purposes: Recreation;Other.
Source: USACE National Inventory of Dams, NID ID IA00981 · Operator website · Matched by proximity (0.08 km)
EPA Impairment Status
Lambach Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IA 01-NEM-68 · Official waterbody report · Matched by proximity (0.6 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
5 EPA-permitted facilities operate within about 5 miles of Lambach Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Lakewood Estates Mobile Home ParkDavenport · 3.4 mi away · NPDES IA0067695Recent violation
- Wild Rose Mobile Home ParkDavenport · 3.6 mi away · NPDES IA0064432Recent violation
- Qc Press WorksDavenport · 3.7 mi away · NPDES IA0060305Recent violation
- Midamerican Energy Company-Blanket PermitDes Moines · 2.5 mi away · NPDES IA0071579
- Kraft Heinz Foods CompanyDavenport · 4.3 mi away · NPDES IA0062502
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
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-10
Monitoring stations: 1