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LakeQuality
C

Lake Tschida

Grant County, WisconsinEutrophic

Lake Tschida is a 10,953-acre productive, nutrient-rich eutrophic lake in Grant County, ND. Water quality is graded C based on 2 sampling years through 2025. Compared to the 5 other monitored lakes in Grant County, Lake Tschida ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2025-09-18. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Very murky, less than 2.4 ft of visibility. Chlorophyll-a: 9.7 µg/L. Trophic State Index: 59.

MetricValueGrade
Water Clarity (Secchi Depth)2.4 ftF
PhosphorusNo data
Chlorophyll-a (Algae)9.7 µg/LB
Trophic State Index (TSI)59Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Surface Area11.0K acres

Location

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County Ranking

Ranked #5 of 6 lakes in Grant County

Cleaner Lakes Within 30 Miles

Lake Tschida holds Grade C. 3 nearby lakes hold higher grades.

See full comparison →

Nearby Lakes in Grant County

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Lake Tschida
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Lake Tschida
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Lake Tschida
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Lake Tschida
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Sheep Creek Dam Lake
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Other Grade C Lakes in Wisconsin

Devils Lake

Ramsey County · Clarity: 5.2 ft

Devils Lake

Benson County · Clarity: 3.7 ft

Carlson-Tande Dam Lake

Griggs County · Clarity: 5.6 ft

Fordville Dam Lake

Grand Forks County · Clarity: 4.4 ft

Silver Lake

Sargent County · Clarity: 5.9 ft

South Golden Lake

Steele County · Clarity: 6.2 ft

Eutrophic Lakes in Wisconsin

Lake AliceJ. Clark Salyer Pool 357E. A. Patterson LakeLake Irvine

Reservoir Info (USACE NID)

Lake Tschida is a man-made reservoir impounded by the Heart Butte Dam (completed 1949), built primarily for flood risk reduction on the HEART RIVER; earth-type dam, 142 ft tall and 1,850 ft long.

Surface area
10,953 ac
Normal storage
75,785 ac-ft
Max storage
451,200 ac-ft
Drainage area
1,714.46 sq mi
Hazard class
High
Owner
BUREAU OF RECLAMATION

All listed purposes: Flood Risk Reduction;Irrigation.

Source: USACE National Inventory of Dams, NID ID ND00149 · Operator website

EPA Impairment Status

Lake Tschida is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

MercuryNutrients (phosphorus, nitrogen)

Source: EPA ATTAINS assessment unit ND-10130202-001-L_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: 2025-09-18

Monitoring stations: 1