Marl Lake
Marl Lake in Waushara County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 15.6 µg/L. Maximum depth: 35 ft. Surface area: 28 acres.
Wisconsin DNR lists Largemouth Bass as common on Marl Lake. DNR survey details →
- Clarity
- 12 ft
- Typical in August
- 76°F
- Max depth
- 35 ft
- Area
- 28 acres
- Type
- Mesotrophic
- Trend
- → Stable
- Public access
- Yes
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Marl Lake is a 28-acre mesotrophic lake in Waushara County, Wisconsin with a maximum depth of 35 feet. Water quality is graded B based on 1 sampling years through 2026. Water clarity is declining over recent sampling years. The lake supports 3 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 15 other monitored lakes in Waushara County, Marl Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-07-12. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
Good clarity, visible to about 12 ft. Phosphorus level: 15.6 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | 15.6 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Marl Lake
Compare lakeside cabins, hotels, and vacation rentals near Marl Lake in Waushara 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 Marl Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Marl Lake typically sits around 76°F at the surface in August. Summer average is about 76°F. Usually warmest in Jul (about 80°F) and coldest in Oct (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 26 field readings (2024–2025) via the EPA Water Quality Portal. See the full Marl Lake water temperature breakdown →
Wisconsin DNR lists Largemouth Bass as common on Marl Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Marl Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. 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. Monitored by volunteers since 1989. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Marl Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2023Marl Lake spring shocking survey, 2023Spring Shocking Survey · WI DNR · 2023 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 35 ft |
| Surface Area | 28 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Marl Lake County ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Marl 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.
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.232 m/yr | 7 |
| Phosphorus | ↑ Improving | -0.51 µg/L/yr | 6 |
County Ranking
Ranked #4 of 16 lakes in Waushara County
Nearby Lakes in Waushara County
Frequently asked questions about Marl Lake
Where is Marl Lake?
- Marl Lake is a lake in Waushara County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Marl Lake?
- Marl Lake in Waushara County, Wisconsin has a water quality grade of B (Good). Water clarity: 12 ft visibility. Phosphorus: 15.6 µg/L. Maximum depth: 35 ft. Surface area: 28 acres.
Is Marl Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Marl Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Marl Lake?
- Marl Lake typically sits around 76°F at the surface in August, from 26 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Marl Lake?
- Marl Lake has a maximum depth of 35 feet. The lake covers 28 acres.
What fish are in Marl Lake?
- Fish species found in Marl Lake include Panfish, Largemouth Bass, Northern Pike. Marl Lake is located in Waushara County, Wisconsin.
What did the DNR fisheries survey find at Marl Lake?
- Wisconsin DNR lists Largemouth Bass as common on Marl Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Marl Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Marl Lake?
- Marl Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Marl Lake County Park. Public access is listed as yes.
Explore Marl Lake across LakeQuality
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Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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Where this data comes from
60 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX60 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory