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LakeQuality
C

Harmony Lake

Mercer County, WisconsinEutrophic

Harmony Lake is a 45-acre productive, nutrient-rich eutrophic lake in Mercer County, ND. Water quality is graded C based on 2 sampling years through 2023. Compared to the 4 other monitored lakes in Mercer County, Harmony Lake ranks #5 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-10-17. Grade methodology: LakeGrade methodology.

Swimming Safety

Generally safe for swimming, moderate water quality

Water Quality Grade: C, Fair

Very murky, less than 2.3 ft of visibility. Chlorophyll-a: 8.4 µg/L. Trophic State Index: 58.

MetricValueGrade
Water Clarity (Secchi Depth)2.3 ftF
PhosphorusNo data
Chlorophyll-a (Algae)8.4 µg/LB
Trophic State Index (TSI)58Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Surface Area44.9 acres

Location

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County Ranking

Ranked #5 of 5 lakes in Mercer County

Cleaner Lakes Within 30 Miles

Harmony Lake holds Grade C. 5 nearby lakes hold higher grades.

See full comparison →

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More Wisconsin Lake Rankings

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Top 25 by overall water quality score

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Panfish-rich, public access

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Other Grade C Lakes in Wisconsin

Lake Tschida

Grant County · Clarity: 6 ft

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

Eutrophic Lakes in Wisconsin

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

Reservoir Info (USACE NID)

Harmony Lake is a man-made reservoir impounded by the Harmony Lake (completed 1998), built primarily for recreation on the East Antelope Creek; earth-type dam, 32 ft tall.

Surface area
44.9 ac
Normal storage
496.3 ac-ft
Max storage
1,290 ac-ft
Drainage area
14.8 sq mi
Hazard class
Low
Owner
ND Game & Fish

All listed purposes: Recreation;Fish and Wildlife Pond.

Source: USACE National Inventory of Dams, NID ID ND00871 · Operator website

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2023-10-17

Monitoring stations: 3