It takes around 2 1/2 hours from Madison to the Camp grounds.
Head North on I-94 toward Wisconsin Dells about 26 miles
As you near Portage take the exit for I-39 toward Wausau
Continue 94.8 miles to the Mosinee exit 179
Follow WI-153 West through Mosinee and continuing out of town on WI-153
Take a left onto Eau Pleine Drive which should be about 10 miles out of Mosinee (if you get to HWY 107 to the right you've gone too far)
At the stop sign you need to go right to stay on Eau Pleine Drive. It will take you into the park
The West portion of Big Eau Pleine is straight ahead (not a left turn, that would be the South portion)
When you get to the parking area the Group Camp site parking will be on the Left
To see a layout of the West Campsites copy and paste the following line into your browser
http://www.co.marathon.wi.us/is/pks/pdf/campgbepW120707.pdf
From the following link: http://www.co.marathon.wi.us/recreation.asp#8
BIG EAU PLEINE PARK (County)
Location: About 18 miles southwest of Wausau. Take Hwy. 153 west of Mosinee to Eau Pleine Park Road and turn south 3.5 miles.
Services: 106 Sites (66 with electric, 40 primitive) Electrical outlets available at campsites, Dumping Station, Swimming Beach, Playground, Picnic Area, Water, Boat Landing, Hiking Trails, Fishing.
The campground is open May through October.
Effective May, 2007 the public is prohibited from bringing any firewood into the park. Firewood is available for sale on site.
Campground reservation phone number is (715) 261-1566.
A group campsite is available and can accommodate up to 200 people. Reservations must be made in advance through the Wausau and Marathon County Parks, Recreation, and Forestry Department, 212 River Drive, Suite2 Wausau 54403-5476.