Granite Lake at
Barron County, Wisconsin155 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for Granite Lake at. Here is what has been measured.
- Eutrophic
- Impaired · Cause unknown
- 2 aquatic invasives
- 34 ft max depth
- Public access
Granite Lake at in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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 →
Granite Lake at is a 155-acre productive, nutrient-rich eutrophic lake in Barron County, Wisconsin with a maximum depth of 34 feet. 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. 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. Methodology: how these readings are compared.
What Granite Lake at is good for
From access and monitoring records, not editorial picks.
- Fishing4 species recorded
- Deep water34 ft surveyed max depth
Swimming conditions
Readings onlyRecreation use not supported
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. Granite Lake at is listed impaired under Clean Water Act §303(d) (IR 5R) for cause unknown. Check local advisories before you swim.
Whether Granite Lake at 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 Granite Lake at
These are the measurements Wisconsin DNR publishes for Granite Lake at, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 6 ft. Phosphorus 23.8 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 23.8µg/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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Granite Lake at
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Granite Lake at typically sits around 70°F at the surface in September. 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.
Column height runs from this lake’s coldest month (60°F) to its warmest (78°F).
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 water quality. LakeQuality shows Granite Lake at’s water-quality measurements separately, 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)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Granite Lake at 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).
- 2019Granite Lake comprehensive survey, 2019Comprehensive Survey · WI DNR · 2019 (PDF)
Lake Details
Max depth
34 ft
Surface area
155 acres
Public access
Yes
Listed by Wisconsin DNR
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Stays near Granite Lake at
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Fish Species
Click a species to see every 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 (2020–2026).
Water clarity
Improving6 years
Phosphorus
Improving-0.41 µg/L/yr7 years
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
Designated uses not supporting: Recreation.
Source: EPA ATTAINS assessment unit WI10004488 · Official waterbody report
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. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Granite Lake at?
- Granite Lake at in Barron County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Granite Lake at is listed impaired under Clean Water Act §303(d) (IR 5R) for cause unknown. Check local advisories before you swim.
What is the water temperature of Granite Lake at?
- Granite Lake at typically sits around 70°F at the surface in September, 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 water quality. LakeQuality shows Granite Lake at’s water-quality measurements separately, 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.
Can I fish at Granite Lake at?
- Public access to Granite Lake at is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore Granite Lake at across LakeQuality
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Species activity outlook by water temperature and season
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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)
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
Impairment status from EPA ATTAINS 303(d) database
Fish and recreation data from Wisconsin DNR Lakes