What is the water quality grade for Island Lake; Republic Township?

Island Lake; Republic Township in Marquette County, Wisconsin received a water quality grade of B (Good). Water clarity: 12 ft visibility.

Is Island Lake; Republic Township safe to swim in?

Good for swimming, clear water with low algae levels. Island Lake; Republic Township has an overall water quality grade of B. Always check local health department advisories before swimming.

What fish are in Island Lake; Republic Township?

Fish species found in Island Lake; Republic Township include Largemouth bass, Pumpkinseed, Walleye, Yellow perch. Island Lake; Republic Township is located in Marquette County, Wisconsin.

Island Lake; Republic Township

Marquette County, WisconsinLimited DataMesotrophic

Island Lake; Republic Township is a mesotrophic lake in Marquette County, MI. Water quality is graded B based on 1 sampling years through 2023. The lake supports 4 documented fish species including Largemouth bass, Pumpkinseed, and Walleye. Compared to the 9 other monitored lakes in Marquette County, Island Lake; Republic Township ranks #8 for water quality.

Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-09-12. Grade methodology: LakeGrade methodology.

Swimming Safety

Good for swimming, clear water with low algae levels

Water Quality Grade: B, Good

Good clarity, visible to about 12 ft. Trophic State Index: 41.

Metric	Value	Grade
Water Clarity (Secchi Depth)	12 ft	B
Phosphorus	No data
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	41	Mesotrophic

Moderate nutrients, good water quality

Fish Species

Largemouth bass Pumpkinseed Walleye Yellow perch

Click a species to see all Wisconsin and Minnesota lakes where it is found.

→ Best fishing times for Island Lake; Republic Township (14-day solunar calendar)

→ Is it safe to eat fish from Island Lake; Republic Township? (mercury & PFAS guide)

→ Island Lake; Republic Township fishing regulations (limits, seasons, special rules)

Location

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County Ranking

Ranked #8 of 10 lakes in Marquette County

Cleaner Lakes Within 30 Miles

Island Lake; Republic Township holds Grade B. 2 nearby lakes hold higher grades.

See full comparison →

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Top 25 by overall water quality score

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Grade A/B + low algae filter

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Panfish-rich, public access

All Wisconsin lakes

Full state directory

Other Grade B Lakes in Wisconsin

Middle Lake; Elba Township; Section 13

Lapeer County · Clarity: 9.5 ft

Portage Lake

Livingston County · Clarity: 13 ft

Bear Lake East Basin; Pleasanton Township

Manistee County · Clarity: 11 ft

Bass Lake

Lake County · Clarity: 14 ft

Long Lake

Cass County · Clarity: 10.5 ft

Byram Lake West Central Basin; Fenton Township

Genesee County · Clarity: 10 ft

Mesotrophic Lakes in Wisconsin

Middle Lake; Elba Township; Section 13 Portage Lake Shavehead Lake East Basin; Porter Township Chippewa Lake Northeast Basin; Chippewa Township

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Most recent sample: 2023-09-12

Monitoring stations: 1