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LakeQuality
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Morgan Lake

Florence County, WisconsinOligotrophic

Morgan Lake earns an A — water clarity, phosphorus, and chlorophyll-a all rate among the best monitored waters in Florence County. Clarity, phosphorus, and chlorophyll-a all rate similarly, so there is no obvious single lever to pull on watershed management.

Trophically, Morgan Lake reads as oligotrophic — nutrient-poor, clear, and ecologically more sensitive to disturbance than richer lakes. At only 10 ft deep, Morgan Lake is shallow — wind keeps the water column mixed and sediment resuspension drives phosphorus levels harder to manage. Morgan Lake is small — 44 acres alongside partial shoreline records — which makes it sensitive to even modest changes in watershed runoff or recreational pressure. Within Florence County's 39 graded lakes, Morgan Lake ranks 23 — below the local median, though not at the bottom.

No invasive species are currently listed at Morgan Lake — the lake remains off the Wisconsin infested-waters roster. Bass fishing is part of the appeal: the species list runs to 1, anchored by largemouth and/or smallmouth bass. A documented public access point at Morgan Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.

Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-22. Grade methodology: LakeGrade methodology.

Swimming Safety

Excellent for swimming, crystal clear water with minimal algae

Water Quality Grade: A, Excellent

Crystal clear, you can see 16.6 ft down. Phosphorus level: 13 µg/L. Trophic State Index: 39.

MetricValueGrade
Water Clarity (Secchi Depth)16.6 ftA
Phosphorus13 µg/LA
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)39Oligotrophic

Low nutrients, clear water, excellent for swimming

Lake Details

CharacteristicValue
Maximum Depth10 ft
Surface Area44 acres
Public AccessYes

Fish Species

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

→ Best fishing times for Morgan Lake (14-day solunar calendar)

→ Is it safe to eat fish from Morgan Lake? (mercury & PFAS guide)

Morgan Lake fishing regulations (limits, seasons, special rules)

Water Quality Trend: Declining

Based on 3 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Declining-1.95 m/yr2

Recreation & Access

1
Boat Landings
Yes
Public Access

Location

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County Ranking

Ranked #23 of 39 lakes in Florence County

Nearby Lakes in Florence County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2016).

Fish Species (DNR-rated)

Largemouth Bass(Present)

Data Sources

Water quality data from the EPA Water Quality Portal

Grading methodology based on Metropolitan Council standards

Fish and recreation data from Wisconsin DNR Lakes

Most recent sample: 2023-08-22

Monitoring stations: 1