Unfortunately, there seems to be a mistake in the prompt as Lake Isom National Wildlife Refuge is located in Tennessee, not Wisconsin. Therefore, a summary about this refuge is provided below:

Lake Isom National Wildlife Refuge is a 1,800-acre wildlife refuge located in the northwest corner of Tennessee. It was established in 1985 to provide habitat for migrating waterfowl and other wildlife species. The refuge includes Lake Isom, which is a shallow lake that provides important feeding and resting areas for waterfowl.

One of the best reasons to visit Lake Isom National Wildlife Refuge is to observe the diverse wildlife that inhabits the area. Visitors can see a variety of waterfowl such as ducks, geese, and swans, as well as other bird species like bald eagles, great blue herons, and ospreys. The refuge is also home to several mammal species like white-tailed deer, beavers, and river otters.

Some points of interest to see at Lake Isom National Wildlife Refuge include the observation deck overlooking the lake, the walking trails that allow visitors to explore the refuge, and the seasonal hunting opportunities for waterfowl and deer.

Interesting facts about Lake Isom National Wildlife Refuge include that it is situated on a major migratory bird route and serves as an important stopover for many species of waterfowl. The refuge also contains several different types of wetland habitats, including emergent marsh, cypress-tupelo swamp, and bottomland hardwood forest.

The best time of year to visit Lake Isom National Wildlife Refuge depends on what activities and wildlife visitors are hoping to see. Spring and fall are the best times for birdwatching as many species of waterfowl migrate through the area. The winter months offer good opportunities for viewing ducks and geese in the lake. Hunting season for waterfowl runs from November to January, while deer season is in late fall.