With nearly a mile of Rock River frontage, Happy Hollow County Park has a variety of habitats including wetlands, grasslands and wooded areas, and is a popular placefor fishing, boating and watching birds. The four miles of trails can be used for hiking and horseback riding from dawn to dusk. 
- 206 acres
 - Restrooms
 - Picnic Tables
 - Trails
 - Boat Launch
 - Fishing
 - River Setting
 - Scenic Views
 - Wooded
 - Pet/Dog Friendly
 
Hours: The park is open from 5am to 10pm.
Address: 1731 W Happy Hollow Rd - Janesville - WI, 53546
Phone: (608) 757-5451
Fax: 608-757-5470