Lake Anita State Park

Lake Anita State Park 
This state park on Lake Anita offers fishing, hiking and camping.  Call 712/762-3564 to be sure of accessibility.  You can download a map and brochure from their website.
Wheelchair Accessible?   A 4-mile paved multi-use trail circles Lake Anita and passed through restored prairie and successional timber.  ” The paved Grass Roots Trail connects Lake Anita with the city of Anita leading to the downtown area.
Wheelchair Accessible?  Nature trail 1/3 mile demonstrates some of the trees in the areas.

George Wyth State Park

George Wyth State Park  –
This park near Waterloo runs along the Cedar River and includes three lakes.  One of them,  George Wyth Lake, is a no wake lake with a handicap accessible fishing pier. Call  319-232-5505 for more information about accessibility and trail conditions.  Although the trails are paved, occasional flooding on the Cedar River may make them inaccessible.  You can download maps from their website.
Wheelchair Accessible?  There are  “…5.5 miles of paved multi-purpose trails, which are great for biking, in-line skating and walking.”  They don’t mention wheelchairs, but I should think a paved trail good enough for in-line skating would qualify.
? There are 6 miles of grass hiking trails.

Elinor Bedell State Park

Elinor Bedell State Park 
This state park near Spirit Lake is on the shore of East Lake Okoboji.  In addition to hiking there is swimming, boating and fishing.  Trails are paved, but call to be sure of conditions 712-337-3211.
Here is the DNR’s website  and the more informational website from Iowa Parks.
Wheelchair Accessible“The park includes an extensive system of paved hiking trails. The trails are accessible to all entrance points connecting activities and points of interest. A raised boardwalk will take park users through the wetland areas and along the lake. The system is approximately 7,500 feet in length, paved, and accessible for persons with mobility impairment.”

Big Creek State Park

Big Creek State Park
This state park, eleven miles NW of Des Moines is near Polk city.   There is fishing, hiking, hunting, and boating.  There is an accessible fishing pier.  Travel Iowa  says the park is “Accessible to Persons with Disabilities.”  Call to be sure just what that includes: 515-984-6473.  Here is the DNR’s website  and the website from Iowa Parks.
Wheelchair Accessible?  The website says a “26-mile paved multi-use trail allows bicyclists and pedestrians to travel from the beach south through the Saylorville Lake area all the way to Des Moines.”  This sounds likely for accessibility, but you had better call to be sure.