Hammil Lake
Bayfield County, Wisconsin77 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Hammil Lake. Here is what has been measured.
- Oligotrophic
- 47 ft max depth
Hammil Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 14.6 ft visibility. Phosphorus: 12.2 µg/L. Maximum depth: 47 ft. Surface area: 77 acres.
Wisconsin DNR lists Panfish as common on Hammil Lake. DNR survey details →
Hammil Lake is a 77-acre cold, clear oligotrophic lake in Bayfield County, Wisconsin with a maximum depth of 47 feet. Water clarity is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Compared to the 23 other monitored lakes in Bayfield County, Hammil Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-06-28. Methodology: how these readings are compared.
What Hammil Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14.6 ft of visibility
- Fishing4 species recorded
- Deep water47 ft surveyed max depth
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Hammil 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 Hammil Lake
These are the measurements Wisconsin DNR publishes for Hammil Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 14.6 ft. Phosphorus 12.2 µg/L. TSI 39.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 14.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 12.2µg/L | Good GoodFairPoor |
| 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. | 39 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Hammil Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR lists Panfish as common on Hammil Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Hammil Lake’s water-quality measurements separately, 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 2000. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
47 ft
Surface area
77 acres
Lake Size & Watershed
Watershed (drainage) area
3 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.5 mi
HydroLAKES / HydroSHEDS
Elevation
1,388 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Hammil Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing Hammil Lake
Water Quality Trend: Stable
Based on 7 years of monitoring (2020–2026).
Water clarity
Improving7 years
Phosphorus
Worsening+0.29 µg/L/yr7 years
Nearby Lakes in Bayfield County
Frequently asked questions about Hammil Lake
Where is Hammil Lake?
- Hammil Lake is a lake in Bayfield County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Hammil Lake?
- Hammil Lake in Bayfield County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Water clarity: 14.6 ft visibility. Phosphorus: 12.2 µg/L. Maximum depth: 47 ft. Surface area: 77 acres.
Is Hammil Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Hammil Lake?
- Hammil Lake has a maximum depth of 47 feet. The lake covers 77 acres.
What fish are in Hammil Lake?
- Fish species found in Hammil Lake include Panfish, Largemouth Bass, Smallmouth Bass, Walleye. Hammil Lake is located in Bayfield County, Wisconsin.
What did the DNR fisheries survey find at Hammil Lake?
- Wisconsin DNR lists Panfish as common on Hammil Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Hammil Lake’s water-quality measurements separately, 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.
Explore Hammil Lake across LakeQuality
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Where this data comes from
74 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_WQX74 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes