Silver Lake Max Depth
Delaware County, WisconsinEutrophic
Silver Lake Max Depth is a 39-acre productive, nutrient-rich eutrophic lake in Delaware County, IA. Water quality is graded F based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-10-21. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2.4 ft of visibility. Chlorophyll-a: 37.6 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 37.6 µg/L | F |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 39 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Delaware County
Cleaner Lakes Within 30 Miles
Silver Lake Max Depth holds Grade F. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Delaware County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Silver Lake Max Depth is a man-made reservoir impounded by the Silver Lake Dam (completed 1948), built primarily for recreation on the TR-MAQUOKETA RIVER; earth-type dam, 25 ft tall and 200 ft long.
- Surface area
- 39 ac
- Normal storage
- 210 ac-ft
- Max storage
- 415 ac-ft
- Drainage area
- 0.4 sq mi
- Hazard class
- Low
- Owner
- Delaware County Conservation Board
Source: USACE National Inventory of Dams, NID ID IA02035 · Operator website · Matched by proximity (0.15 km)
EPA Impairment Status
Silver Lake Max Depth 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-MAQ-17 · Official waterbody report · Matched by proximity (0.27 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-10-21
Monitoring stations: 1