Castle Rock Lake
Juneau County, Wisconsin12,991 acresView mapDirections
No nutrient or algae sampling on record from Wisconsin DNR for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 36 ft max depth
- Public access
Castle Rock Lake in Juneau County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 36 ft. Surface area: 12991 acres.
Castle Rock Lake is a 12,991-acre lake in Juneau County, Wisconsin with a maximum depth of 36 feet. Limited fish-species data available. Public access is available with 6 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water. Methodology: how these readings are compared.
What Castle Rock Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch6 documented ramps
- Deep water36 ft surveyed max depth
- Big water12,991 acres
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Castle Rock Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pFAS. Check local advisories before you swim.
Whether Castle Rock Lake 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 Castle Rock Lake
These are the measurements Wisconsin DNR publishes for Castle Rock Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Castle Rock Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
36 ft
Surface area
12,991 acres
Shoreline
84 mi
Public access
Yes
Listed by Wisconsin DNR
Recreation & Access
- Little Roche A Cri - SouthPublic
- Buckhorn State ParkPublic
- Snug HarborSemi-private
- Little Roche A Cri - NorthSemi-private
- Mays PointSemi-private
- Lakeside WaterfrontSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Castle Rock Lake
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Fishing Castle Rock Lake
EPA Impairment Status
Castle Rock Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit WI10008631 · Official waterbody report
Nearby Lakes in Juneau County
Frequently asked questions about Castle Rock Lake
Where is Castle Rock Lake?
- Castle Rock Lake is a lake in Juneau County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of Castle Rock Lake?
- Castle Rock Lake in Juneau County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Maximum depth: 36 ft. Surface area: 12991 acres.
Is Castle Rock Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Castle Rock Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pFAS. Check local advisories before you swim.
How deep is Castle Rock Lake?
- Castle Rock Lake has a maximum depth of 36 feet. The lake covers 12991 acres.
Are there boat ramps on Castle Rock Lake?
- Castle Rock Lake has 6 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Little Roche A Cri - South, Buckhorn State Park, Snug Harbor, Little Roche A Cri - North, among others. Public access is listed as yes.
Can I fish at Castle Rock Lake?
- Castle Rock Lake has 6 documented boat landings in the USGS National Boat Ramps inventory. 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.
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Where this data comes from
Measurements for Castle Rock Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory