Carlson-Tande Dam Lake
Griggs County, WisconsinEutrophic
Carlson-Tande Dam Lake is a 16-acre productive, nutrient-rich eutrophic lake in Griggs County, ND. Water quality is graded C based on 2 sampling years through 2025. Compared to the 1 other monitored lakes in Griggs County, Carlson-Tande Dam Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-10-14. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 5.6 ft. Chlorophyll-a: 8.1 µg/L. Trophic State Index: 52.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.6 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 8.1 µg/L | B |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15.79 acres |
Location
County Ranking
Ranked #1 of 2 lakes in Griggs County
Nearby Lakes in Griggs County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Carlson-Tande Dam Lake is a man-made reservoir impounded by the Carlson-Tande Dam (completed 1967), built primarily for recreation on the Sheyenne River-TR; earth-type dam, 29 ft tall and 425 ft long.
- Surface area
- 15.79 ac
- Normal storage
- 152.35 ac-ft
- Max storage
- 232.23 ac-ft
- Drainage area
- 1.72 sq mi
- Hazard class
- Low
- Owner
- Griggs County WRB
Source: USACE National Inventory of Dams, NID ID ND00299 · Operator website
EPA Impairment Status
Carlson-Tande Dam 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 ND-09020203-005-L_00 · Official waterbody report · Matched by proximity (0.19 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: 2025-10-14
Monitoring stations: 1