Smith Lake
Smith Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 15.6 µg/L. Maximum depth: 11 ft. Surface area: 20 acres.
- Max depth
- 11 ft
- Area
- 20 acres
- Public access
- Yes
Next lake in Marinette County
Why Smith Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Smith Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Smith Lake is a 20-acre lake in Marinette County, Wisconsin with a maximum depth of 11 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2022-09-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Smith Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 15.6 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 15.6 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Smith Lake
Compare lakeside cabins, hotels, and vacation rentals near Smith Lake in Marinette County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Surface Area | 20 acres |
| Public Access | Yes |
Recreation & Access
- Morgan County ParkPublic
Fishing Smith Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2022).
Graded lakes near Smith Lake
Smith Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Marinette County
Frequently asked questions about Smith Lake
What is the water quality grade for Smith Lake?
- Smith Lake in Marinette County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 15.6 µg/L. Maximum depth: 11 ft. Surface area: 20 acres.
Is Smith Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Smith Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Smith Lake?
- Smith Lake has a maximum depth of 11 feet. The lake covers 20 acres.
Are there boat ramps on Smith Lake?
- Smith Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Morgan County Park. Public access is listed as yes.
Explore Smith Lake across LakeGrade
3.8 mi away
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX2 samples · 2022
Analytical methods
- Phosphorus by Colorimetry
- Turbidity in Water
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory