Hammil Lake
Hammil Lake in Bayfield County, Wisconsin has a water quality grade of B (Good). Water clarity: 14.6 ft visibility. Phosphorus: 12.2 µg/L. Maximum depth: 47 ft. Surface area: 77 acres.
- Clarity
- 14.6 ft
- Max depth
- 47 ft
- Area
- 77 acres
- Type
- Oligotrophic
- Trend
- → Stable
Next lake in Bayfield County
Hammil Lake is a 77-acre cold, clear oligotrophic lake in Bayfield County, Wisconsin with a maximum depth of 47 feet. Water quality is graded B based on 1 sampling years through 2026. 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. Grade methodology: LakeGrade 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 14.6 ft. Phosphorus level: 12.2 µg/L. Trophic State Index: 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.6 ft | Not graded |
| Phosphorus | 12.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Hammil Lake
Compare lakeside cabins, hotels, and vacation rentals near Hammil Lake in Bayfield 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 | 47 ft |
| Surface Area | 77 acres |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Hammil Lake
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)
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.394 m/yr | 7 |
| Phosphorus | ↓ Declining | +0.29 µg/L/yr | 7 |
County Ranking
Ranked #14 of 24 lakes in Bayfield County
Nearby Lakes in Bayfield County
Frequently asked questions about Hammil Lake
What is the water quality grade for Hammil Lake?
- Hammil Lake in Bayfield County, Wisconsin has a water quality grade of B (Good). 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?
- Good for swimming, clear water with low algae levels. Hammil Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
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.
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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)
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