Raintree Lake
Cass County, WisconsinEutrophic
Raintree Lake is a 475-acre productive, nutrient-rich eutrophic lake in Cass County, MO. Water quality is graded F based on 3 sampling years through 2023. Compared to the 4 other monitored lakes in Cass County, Raintree Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-17. 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 2.5 ft of visibility. Phosphorus level: 66.4 µg/L. Chlorophyll-a: 34.5 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.5 ft | F |
| Phosphorus | 66.4 µg/L | D |
| Chlorophyll-a (Algae) | 34.5 µg/L | F |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 475 acres |
Location
County Ranking
Ranked #1 of 5 lakes in Cass County
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
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Raintree Lake is a man-made reservoir impounded by the Raintree Lake Dam (completed 1974), built primarily for recreation on the MIDDLE BIG CREEK; earth-type dam, 55 ft tall and 1,900 ft long.
- Surface area
- 475 ac
- Normal storage
- 3,570 ac-ft
- Max storage
- 7,220 ac-ft
- Drainage area
- 7.45 sq mi
- Hazard class
- High
- Owner
- RAINTREE LAKE DEV CORP
Source: USACE National Inventory of Dams, NID ID MO20388 · Operator website
EPA Impairment Status
Raintree 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_7213.00 · 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: 2023-09-17
Monitoring stations: 1