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LakeQuality

Hazel Hill Lake by Dam vs Knob Noster S.P. Lake 2

Water quality, depth, fish species, and recreation comparison.

Knob Noster S.P. Lake 2 has a higher water quality grade (C, Fair) than Hazel Hill Lake by Dam (D, Poor). Both are in Johnson County, Wisconsin.

Both Hazel Hill Lake by Dam and Knob Noster S.P. Lake 2 sit in Missouri. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. The grades are close: Hazel Hill Lake by Dam (D) and Knob Noster S.P. Lake 2 (C) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.

With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.

D

Hazel Hill Lake by Dam

Johnson County, Wisconsin

Very murky, less than 2 ft of visibility.

C

Knob Noster S.P. Lake 2

Johnson County, Wisconsin

Murky, only visible to about 3.9 ft.

Side-by-Side Metrics

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

Source: EPA National Aquatic Resource Surveys, 2026.

MetricHazel Hill Lake by DamKnob Noster S.P. Lake 2
Overall GradeD (Poor)C (Fair)
Water Clarity2 ft3.9 ft
Phosphorus59.3 µg/L29 µg/L
Chlorophyll-a (Algae)28 µg/L10.6 µg/L
Maximum Depth--
Surface Area71 acres16 acres
Public AccessUnknownUnknown
Fish Species00
Trophic Stateeutrophiceutrophic

Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).

Verdict

Knob Noster S.P. Lake 2 wins on overall water quality with a Grade C versus Hazel Hill Lake by Dam's Grade D. Water clarity: 3.9 ft vs 2 ft. For fishing diversity, Knob Noster S.P. Lake 2 also leads with 0 species.