Blackhawk Campground
3407 E Blackhawk Dr
Milton, WI 53563

Private campground on Clear Lake, just north of Milton. Water is sampled at the licensed swimming beach. Water recreational activities include swimming, fishing, and boating.

Weekly Water Testing Information

• E. coli cfu per 100 ml shown:  <1 sampled on 09/29/2025
• Normal Conditions 

 Historical Data

Lakeland Campground
2803 E State Rd 59
Milton, WI 53563

Private campground on Lake Koshkonong, north of Milton. Water is sampled at the licensed swimming beach. Water recreational activities include swimming, fishing, skiing, and boating.

Weekly Water Testing Information

• E. coli cfu per 100 ml shown: 4 sampled on 9/29/2025
• Normal Conditions

 Historical Data

Lakeview Campground
1901 WI-59
Milton, WI 53563

Private campground on Lake Koshkonong, north of Milton. Water is sampled at the licensed swimming beach. Water recreational activities include swimming, fishing, skiing, and boating.

Weekly Water Testing Information

• E. coli cfu per 100 ml shown:  11 on 9/29/2025
• Normal Conditions 

Historical Data

Preservation Park
3444 S Riverside Dr
Beloit, WI 53511

Town of Beloit park with a boat launch on the Rock River. Water is sampled at the boat launch dock. Water recreational activities include skiing, fishing, and boating.

Weekly Water Testing Information

• E. coli cfu per 100 ml shown:  42 on 9/29/2025
• Normal Conditions

 Historical Data

City of Janesville Park with a boat launch on the Rock River. Water is sampled at the dock, just south of the Rock Aqua Jays ski show platform. Water recreational activities include skiing, fishing, and boating.

Weekly Water Testing Information

• E. coli cfu per 100 ml shown:  21 on 9/29/2025
• Normal Conditions

Historical Data

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown:  210 on 9/17/2025
• Normal Conditions

Historical Data

Gibbs Lake Park
9103 West Gibbs Lake Road
Edgerton, WI 53534

Water is sampled at the county park boat launch. Water recreational opportunities include fishing, canoeing, and boating.

Monthly Water Testing Information

• E. coli cfu per 100 ml shown: 37 on 9/17/2025
• Normal conditions

Historical Data

Carver Roehl Park
4907 South Carvers Rock Road
Clinton, WI 53525

Spring Brook is a small stream flowing through Carver Roehl County Park.

Monthly Water Testing Information

• E. coli cfu per 100 ml shown: 435 on 9/17/2025
• Caution is advised due to elevated E Coli bacteria

Historical Data

Palmer Park
2501 Palmer Dr
Janesville, WI 53545

Spring Brook is a small stream that flows through Palmer Park and Blackhawk Golf Course. Water is sampled at the Sharon Road Bridge near Blackhawk Golf Course.

Monthly Water Testing Information

• E. coli cfu per 100 ml shown:  921 on 9/17/2025
• Caution is advised due to elevated E Coli bacteria

 Historical Data

Storrs Lake Wildlife Area
E Storrs Lake Rd
Milton, WI 53563

Wisconsin DNR Wildlife Area with a boat launch on Storrs Lake. Water is sampled at the boat launch dock. Water recreational opportunities include fishing, boating, and canoeing.

Monthly Water Testing Information

• E. coli cfu per 100 ml shown: 4 on 9/17/2025
• Normal Conditions

Historical Data

Sugar River Park
11317 S Nelson Rd
Janesville, WI 53545

Rock County Park with a canoe launch on the Sugar River. Water is sampled from the bridge near the park. Water recreational opportunities include fishing and canoeing.

Monthly Water Testing Information

• E. coli cfu per 100 ml shown:  99 on 9/17/2025
• Normal Conditions 

Historical Data

Water is sampled at Sweet Allyn park in the Town of Turtle. Popular canoeing and fishing spot.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 37 on 9/17/2025
• Normal Conditions

 Historical Data

The Yahara River is tested at Murwin County Park. Water recreational opportunities include fishing and canoeing.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown:  188 on 9/17/2025
• Normal Conditions

Historical Data

Bass Creek flows from western Rock County into the Rock River. Water is sampled at the County D bridge in the Town of Rock.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 649 on 6/24/25
• Normal Conditions

Historical Data

Beckman Mill Pond is formed by the damming of Racoon Creek in the Town of Newark.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 201 on 6/24/25
• Normal Conditions

Historical Data

Located near the corner of Portland Ave and S Riverside Dr in Riverside Park, Beloit

A small lagoon in Riverside Park. Water recreational opportunities include fishing and paddle boats.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 249 on 6/24/25
• Normal conditions

Historical Data

A small stream flowing through Rockport Park in the City of Janesville. Water is sampled near the Afton Rd. parking lot.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: >2,419 on 6/24/2025
• Caution is advised due to elevated E Coli

Historical Data

Former gravel pit with a boat launch. Located off of Sharon Rd and adjacent to Blackhawk Golf Course in the City of Janesville.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 55 on 6/24/25
• Normal Conditions

Historical Data

Lake Leota is a 40-acre stream-fed lake in the City of Evansville. It is a popular location for fishing and canoeing.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown:  50 on 6/24/25
• Normal Conditions

Historical Data

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: >2,419 on 6/24/25
• Caution is advised due to elevated E Coli

Historical Data

A small stream originating in western Rock County that empties into the Rock River in the Town of Janesville.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: >2,419 on 7/2/2025
• Caution is advised due to elevated E Coli

Historical Data

Otter Creek is a small stream that flows into Lake Koshkonong. Water is sampled at County Rd N in the Town of Milton.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 629 on 6/18/2024
• Normal Conditions

Historical Data

A small stream that flows through the City of Edgerton and eventually into Lake Koshkonong. Water is sampled at Central Park in Edgerton.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: >2,419 on 6/24/25
• Caution is advised due to elevated E Coli

Historical Data

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 435 on 6/24/2025
• Normal Conditions

Historical Data

A small lagoon connected to the Rock River in Traxler Park, City of Janesville.

Seasonal Water Testing Information

• E. coli cfu per 100 ml shown: 131 on 6/24/25
• Normal Conditions

Historical Data