Shannon Lake
Marinette County, Wisconsin58 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Shannon Lake. Here is what has been measured.
- 37 ft max depth
- Limited data
Shannon Lake in Marinette County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 18.5 µg/L. Maximum depth: 37 ft. Surface area: 58 acres.
Wisconsin DNR lists Northern Pike as present on Shannon Lake. DNR survey details →
Shannon Lake is a 58-acre lake in Marinette County, Wisconsin with a maximum depth of 37 feet. Overall water quality is improving over recent sampling years. The lake supports 1 documented fish species including Northern Pike.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-08-02. Methodology: how these readings are compared.
What Shannon Lake is good for
From access and monitoring records, not editorial picks.
- Deep water37 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Shannon Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Shannon Lake
These are the measurements Wisconsin DNR publishes for Shannon Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 7.5 ft. Phosphorus 18.5 µg/L. TSI 47.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 7.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 18.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 47 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Shannon Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Northern Pike as present on Shannon Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Shannon Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Fish Species (DNR-rated)
Lake Details
Max depth
37 ft
Surface area
58 acres
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Stays near Shannon Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Shannon Lake
Water quality readings over time
2 seasons of samples on record (2020–2022). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Improving-3.55 µg/L/yr2 years
Nearby Lakes in Marinette County
Frequently asked questions about Shannon Lake
Where is Shannon Lake?
- Shannon Lake is a lake in Marinette County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Shannon Lake?
- Shannon Lake in Marinette County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 7.5 ft visibility. Phosphorus: 18.5 µg/L. Maximum depth: 37 ft. Surface area: 58 acres.
Is Shannon Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Shannon Lake?
- Shannon Lake has a maximum depth of 37 feet. The lake covers 58 acres.
What fish are in Shannon Lake?
- Fish species found in Shannon Lake include Northern Pike. Shannon Lake is located in Marinette County, Wisconsin.
What did the DNR fisheries survey find at Shannon Lake?
- Wisconsin DNR lists Northern Pike as present on Shannon Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Shannon Lake’s water-quality measurements separately, and the water-quality trend over 2 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Explore Shannon Lake across LakeQuality
3.7 mi away
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Where this data comes from
4 measurements from 1 monitoring station, 2020–2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX4 samples · 2020–2022
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Fish and recreation data from Wisconsin DNR Lakes