Lambach Lake
Scott County, Iowa9 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- Impaired · Algal growth
- #5 of 5 in the county
Lambach Lake in Scott County, Iowa has a water quality grade of C (Fair). Water clarity: 7.9 ft visibility. Phosphorus: 63 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 9 acres.
- Clarity
- 7.9 ft
- Area
- 9 acres
- Type
- Mesotrophic
- Phosphorus
- 63 µg/L
- Chlorophyll-a
- 5.1 µg/L
- Trend
- ↑ Improving
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Watch Lambach Lake’s letter
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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.
Lambach Lake is a 9-acre mesotrophic lake in Scott County, Iowa. Water quality is graded C 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 #5 for water quality.
Source: EPA Water Quality Portal sampling records, Iowa DNR, last sampled 2024-09-10. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Lambach Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 7.9 ft. Phosphorus 63 µg/L. Chlorophyll-a 5.1 µg/L. TSI 53. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.9 ft | Not graded |
| Phosphorus | 63 µg/L | Poor |
| Chlorophyll-a (Algae) | 5.1 µg/L | Good |
| Trophic State Index (TSI) | 53 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 9 acres |
No bathymetric survey has been published for Lambach Lake, so its depth is not documented here.
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 |
| Phosphorus | ↑ Improving | -41.11 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -51.81 µg/L/yr | 4 |
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)
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.
County Ranking
Ranked #5 of 5 lakes in Scott County
Nearby Lakes in Scott County
Frequently asked questions about Lambach Lake
Where is Lambach Lake?
- Lambach Lake is a lake in Scott County, Iowa. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lambach Lake?
- Lambach Lake in Scott County, Iowa has a water quality grade of C (Fair). Water clarity: 7.9 ft visibility. Phosphorus: 63 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 9 acres.
Is Lambach Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Lambach Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for algal growth. Check local advisories before you swim.
Explore Lambach Lake across LakeQuality
More Iowa Lake Rankings
Other Grade C Lakes in Iowa
Mesotrophic Lakes in Iowa
Where this data comes from
36 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Iowa DNR Surface Water Monitoring Data
21IOWA_WQX36 samples · 2023–2024
Analytical methods
- Unknown
- Phosphorus by Colorimetry
- In-Vitro Determination of Chlorophyll
- ISU modification of APHA 2130-B
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)