Deep Lake
Deep Lake in Washburn County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 16.5 µg/L. Maximum depth: 25 ft. Surface area: 43 acres.
Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Deep Lake. DNR survey details →
- Clarity
- 7.5 ft
- Typical in August
- 75°F
- Max depth
- 25 ft
- Area
- 43 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Washburn County
Swipe left or right on this bar to open the next or previous lake.
Deep Lake is a 43-acre mesotrophic lake in Washburn County, Wisconsin with a maximum depth of 25 feet. Water quality is graded B based on 1 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 3 public boat landings. Compared to the 26 other monitored lakes in Washburn County, Deep Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-11-17. Grade methodology: LakeQuality methodology.
Watch Deep Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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)
Moderate clarity, visible to about 7.5 ft. Phosphorus level: 16.5 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.5 ft | Not graded |
| Phosphorus | 16.5 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Deep Lake
Compare lakeside cabins, hotels, and vacation rentals near Deep Lake in Washburn 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 Deep Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Deep Lake typically sits around 75°F at the surface in August. Summer average is about 75°F. Usually warmest in Jul (about 77°F) and coldest in Nov (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 39 field readings (2024–2025) via the EPA Water Quality Portal. See the full Deep Lake water temperature breakdown →
Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Deep Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Deep Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is improving. 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 1968. 2 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 25 ft |
| Surface Area | 43 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Little Devil LakePublic
- Deep LakePublic
- Moody LakePublic
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 Deep Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.386 m/yr | 6 |
| Phosphorus | ↑ Improving | -3.82 µg/L/yr | 6 |
EPA Impairment Status
Deep Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10004500 · Official waterbody report
County Ranking
Ranked #2 of 27 lakes in Washburn County
Nearby Lakes in Washburn County
Frequently asked questions about Deep Lake
Where is Deep Lake?
- Deep Lake is a lake in Washburn County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Deep Lake?
- Deep Lake in Washburn County, Wisconsin has a water quality grade of B (Good). Water clarity: 7.5 ft visibility. Phosphorus: 16.5 µg/L. Maximum depth: 25 ft. Surface area: 43 acres.
Is Deep Lake safe to swim in?
- Good for swimming, clear water with low algae levels. Deep Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Deep Lake?
- Deep Lake typically sits around 75°F at the surface in August, from 39 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Deep Lake?
- Deep Lake has a maximum depth of 25 feet. The lake covers 43 acres.
What fish are in Deep Lake?
- Fish species found in Deep Lake include Musky, Panfish, Largemouth Bass, Walleye. Deep Lake is located in Washburn County, Wisconsin.
What did the DNR fisheries survey find at Deep Lake?
- Wisconsin DNR rates Panfish and Largemouth Bass as abundant on Deep Lake. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Deep Lake B from EPA Water Quality Portal chemistry, and the water-quality trend over 6 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Deep Lake?
- Deep Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Little Devil Lake, Deep Lake, Moody Lake. Public access is listed as yes.
Explore Deep Lake across LakeQuality
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Washburn County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Hayward Lakes area
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Chippewa River Watershed, ranked by water quality
Moderate nutrients, good water quality
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
Where this data comes from
109 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX109 samples · 2020–2025
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
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