Mallard Lake
Mallard Lake in Milwaukee County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Maximum depth: 10 ft. Surface area: 16 acres.
Wisconsin DNR lists Panfish as present on Mallard Lake. DNR survey details →
- Clarity
- 5 ft
- Max depth
- 10 ft
- Area
- 16 acres
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Why Mallard Lake has no grade
We grade a lake only when the monitoring record supports a letter: 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 Mallard Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus 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.
Mallard Lake is a 16-acre lake in Milwaukee County, Wisconsin with a maximum depth of 10 feet. The lake supports 1 documented fish species including Panfish.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2024-09-26. Grade methodology: LakeQuality 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 Mallard Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 5 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Mallard Lake
Compare lakeside cabins, hotels, and vacation rentals near Mallard Lake in Milwaukee 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.
Top-rated places to stay near Mallard Lake
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Wisconsin DNR lists Panfish as present on Mallard Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Mallard Lake — official chemistry is on file, not a letter. 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 2024).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10 ft |
| Surface Area | 16 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Mallard Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Graded lakes near Mallard Lake
Mallard Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Milwaukee County
Frequently asked questions about Mallard Lake
Where is Mallard Lake?
- Mallard Lake is a lake in Milwaukee County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Mallard Lake?
- Mallard Lake in Milwaukee County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 5 ft visibility. Maximum depth: 10 ft. Surface area: 16 acres.
Is Mallard Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mallard 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 Mallard Lake?
- Mallard Lake has a maximum depth of 10 feet. The lake covers 16 acres.
What fish are in Mallard Lake?
- Fish species found in Mallard Lake include Panfish. Mallard Lake is located in Milwaukee County, Wisconsin.
What did the DNR fisheries survey find at Mallard Lake?
- Wisconsin DNR lists Panfish as present on Mallard Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality does not assign an A–F grade on Mallard Lake — official chemistry is on file, not a letter. Catch rate is not a swim clearance and is not a weekly bite report.
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Where this data comes from
1 measurement from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX1 sample · 2024
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