Radigan Flowage Lake
Douglas County, WisconsinEutrophic
On the LakeGrade rubric Radigan Flowage Lake fails the cutoffs — a TSI of 68 and persistent algal pressure put it in the bottom tier. The three sub-grades — clarity, phosphorus, and chlorophyll-a — track close together, so no single parameter is dragging the average.
Eutrophic conditions are the baseline here: clarity drops noticeably in late summer, and dissolved oxygen near the bottom can become a concern. The lake's maximum depth is not yet documented in state morphometric records — context for its physical structure remains limited. At 150 acres, Radigan Flowage Lake fits the Wisconsin median for monitored lakes, with partial shoreline records. Within the 44 graded lakes of Douglas County, Radigan Flowage Lake sits at rank 44, near the bottom of the county list.
No invasive species are currently listed at Radigan Flowage Lake — the lake remains off the Wisconsin infested-waters roster. The state fisheries records do not list documented species for Radigan Flowage Lake, which usually reflects a lack of formal fisheries survey work rather than an empty lake. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-09. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 2 ft of visibility. Phosphorus level: 94.9 µg/L. Trophic State Index: 68.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | F |
| Phosphorus | 94.9 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 68 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 150 acres |
| Public Access | Yes |
Recreation & Access
Location
County Ranking
Ranked #44 of 44 lakes in Douglas County
Cleaner Lakes Within 30 Miles
Radigan Flowage Lake holds Grade F. 2 nearby lakes hold higher grades.
- ADeer LakeBurnett County · mi · Two grade letters higher (F → A)
- BPerson LakeDouglas County · mi · Two grade letters higher (F → B)
Nearby Lakes in Douglas County
More Wisconsin Lake Rankings
State Parks Near Radigan Flowage Lake
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Radigan Flowage Lake is a man-made reservoir impounded by the Radigan (completed 1938), built primarily for recreation on the Upper Tamarack River; gravity-type dam, 12 ft tall and 300 ft long.
- Surface area
- 150 ac
- Normal storage
- 230 ac-ft
- Max storage
- 420 ac-ft
- Drainage area
- 41 sq mi
- Hazard class
- High
- Owner
- Town Of Dairyland
Source: USACE National Inventory of Dams, NID ID WI00257 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-09-09
Monitoring stations: 1
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