Siskiwit Lake
Siskiwit Lake in Bayfield County, Wisconsin has a water quality grade of B (Good). Phosphorus: 24 µg/L. Maximum depth: 13 ft. Surface area: 285 acres.
- Max depth
- 13 ft
- Area
- 285 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Bayfield County
Siskiwit Lake is a 285-acre mesotrophic lake in Bayfield County, Wisconsin with a maximum depth of 13 feet. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. The lake supports 5 documented fish species including Panfish, Largemouth Bass, and Smallmouth Bass. Public access is available. Compared to the 23 other monitored lakes in Bayfield County, Siskiwit Lake ranks #20 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-08-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
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)
No clarity data. Phosphorus level: 24 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 24 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Siskiwit Lake
Compare lakeside cabins, hotels, and vacation rentals near Siskiwit 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.
Top-rated places to stay near Siskiwit Lake
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 13 ft |
| Surface Area | 285 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Siskiwit LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Siskiwit Lake
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2024).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Siskiwit 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).
- 2024Siskiwit Lake spring shocking survey, 2024Spring Shocking Survey · WI DNR · 2024 (PDF)
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -0.75 µg/L/yr | 3 |
EPA Impairment Status
Siskiwit Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10008910 · Official waterbody report
County Ranking
Ranked #20 of 24 lakes in Bayfield County
Nearby Lakes in Bayfield County
Frequently asked questions about Siskiwit Lake
What is the water quality grade for Siskiwit Lake?
- Siskiwit Lake in Bayfield County, Wisconsin has a water quality grade of B (Good). Phosphorus: 24 µg/L. Maximum depth: 13 ft. Surface area: 285 acres.
Is Siskiwit Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Siskiwit Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
How deep is Siskiwit Lake?
- Siskiwit Lake has a maximum depth of 13 feet. The lake covers 285 acres.
What fish are in Siskiwit Lake?
- Fish species found in Siskiwit Lake include Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Siskiwit Lake is located in Bayfield County, Wisconsin.
Are there boat ramps on Siskiwit Lake?
- Siskiwit Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Siskiwit Lake. Public access is listed as yes.
Explore Siskiwit Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Bayfield County
Species activity outlook by water temperature and season
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Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
Planning a trip around Apostle Islands?
Siskiwit Lake is about 25 miles from Apostle Islands National Lakeshore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Apostle Islands →More Wisconsin Lake Rankings
State Parks Near Siskiwit Lake
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
4 measurements from 3 monitoring stations, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2021–2022 - USGS Wisconsin Water Science Center
USGS-WI1 sample · 2023
Analytical methods
- Phosphorus, wu,FIA EPA365.4 (WI)
- Phosphorus by Colorimetry
- Turbidity in Water
Monitoring station identifiers (3)
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
Impairment status from EPA ATTAINS 303(d) database
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