North Lake
Cass County, WisconsinHypereutrophic
North Lake is a 28-acre highly nutrient-loaded hypereutrophic lake in Cass County, MO. Water quality is graded F based on 3 sampling years through 2024. Compared to the 4 other monitored lakes in Cass County, North Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-08-06. 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 1.6 ft of visibility. Phosphorus level: 152 µg/L. Chlorophyll-a: 60.3 µg/L. Trophic State Index: 73.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | F |
| Phosphorus | 152 µg/L | F |
| Chlorophyll-a (Algae) | 60.3 µg/L | F |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 28 acres |
Location
County Ranking
Ranked #5 of 5 lakes in Cass County
Cleaner Lakes Within 30 Miles
North Lake holds Grade F. 4 nearby lakes hold higher grades.
- FHarrisonville City LakeCass County · 1.9 mi · Higher overall water quality score
- FHarrisonville LakeCass County · 5.7 mi · Higher overall water quality score
- FRaintree LakeCass County · 10.3 mi · Higher overall water quality score
- FCoot LakeJackson County · 12.7 mi · Higher overall water quality score
Nearby Lakes in Cass County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
St. Louis County · Clarity: 1.6 ft
Jackson County · Clarity: 2 ft
St. Charles County · Clarity: 2.3 ft
St. Francois County · Clarity: 1.1 ft
Saline County · Clarity: 2.3 ft
Polk County · Clarity: 1.2 ft
Hypereutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
North Lake is a man-made reservoir impounded by the North Lake Dam (completed 1955), built primarily for recreation on the TR-POLECAT CREEK; earth-type dam, 28 ft tall.
- Surface area
- 28 ac
- Normal storage
- 233 ac-ft
- Max storage
- 419 ac-ft
- Drainage area
- 1,280 sq mi
- Hazard class
- Low
- Owner
- CITY OF HARRISONVILLE
All listed purposes: Recreation;Water Supply.
Source: USACE National Inventory of Dams, NID ID MO20078 · Operator website
EPA Impairment Status
North Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7218.00 · Official waterbody report
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: 2024-08-06
Monitoring stations: 2