Granite Lake at
Granite Lake at in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 23.8 µg/L. Maximum depth: 34 ft. Surface area: 155 acres.
Wisconsin DNR lists Largemouth Bass as common on Granite Lake at. DNR survey details →
- Clarity
- 6 ft
- Typical in August
- 71°F
- Max depth
- 34 ft
- Area
- 155 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
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Granite Lake at is a 155-acre productive, nutrient-rich eutrophic lake in Barron County, Wisconsin with a maximum depth of 34 feet. Water quality is graded B based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 27 other monitored lakes in Barron County, Granite Lake at ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-31. 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)
Murky, only visible to about 6 ft. Phosphorus level: 23.8 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | Not graded |
| Phosphorus | 23.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Granite Lake at
Compare lakeside cabins, hotels, and vacation rentals near Granite Lake at in Barron 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 Granite Lake at
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Planning a whole trip? See where to stay at Wisconsin’s top lakes →
Water Temperature
Granite Lake at typically sits around 71°F at the surface in August. Summer average is about 74°F. Usually warmest in Jul (about 78°F) and coldest in May (about 60°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 16 field readings (2024–2025) via the EPA Water Quality Portal. See the full Granite Lake at water temperature breakdown →
Wisconsin DNR lists Largemouth Bass as common on Granite Lake at.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Granite Lake at B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 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 1994. 4 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 34 ft |
| Surface Area | 155 acres |
| Public Access | Yes |
Recreation & Access
- Granite 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 Granite Lake at
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: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.364 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.41 µg/L/yr | 7 |
EPA Impairment Status
Granite Lake at 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 WI10004488 · Official waterbody report · Matched by proximity (0.78 km)
County Ranking
Ranked #15 of 28 lakes in Barron County
Nearby Lakes With Higher Grades
Granite Lake at holds Grade B. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Barron County
Frequently asked questions about Granite Lake at
Where is Granite Lake at?
- Granite Lake at is a lake in Barron County, Wisconsin. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Granite Lake at?
- Granite Lake at in Barron County, Wisconsin has a water quality grade of B (Good). Water clarity: 6 ft visibility. Phosphorus: 23.8 µg/L. Maximum depth: 34 ft. Surface area: 155 acres.
Is Granite Lake at safe to swim in?
- Good for swimming, clear water with low algae levels. Granite Lake at has a water quality grade of B (Good). Always check local health department advisories before swimming.
What is the water temperature of Granite Lake at?
- Granite Lake at typically sits around 71°F at the surface in August, from 16 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Granite Lake at?
- Granite Lake at has a maximum depth of 34 feet. The lake covers 155 acres.
What fish are in Granite Lake at?
- Fish species found in Granite Lake at include Panfish, Largemouth Bass, Northern Pike, Walleye. Granite Lake at is located in Barron County, Wisconsin.
What did the DNR fisheries survey find at Granite Lake at?
- Wisconsin DNR lists Largemouth Bass as common on Granite Lake at. A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades Granite Lake at B from EPA Water Quality Portal chemistry, and the water-quality trend over 7 years of monitoring is improving. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on Granite Lake at?
- Granite Lake at has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Granite Lake. Public access is listed as yes.
Explore Granite Lake at across LakeQuality
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Fish species and best lakes in Barron County
Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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State Parks Near Granite Lake at
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Where this data comes from
44 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_WQX44 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
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