Here is the sad result of living in a farming state with the richest soil in the world. I can only assume that this is mostly a result of the transition from small family farms to big agribusiness. The following is from “State Park Paths 2013” by Mark S. Edwards, formerly for 30 years the Trails Coordinator for the Iowa Department of Natural Resources:
“Iowa started our state park system around the early 1900’s because there was so little left undisturbed. Even before we could designate these areas as parks they had been clear-cut, mined, plowed and heavily grazed. Iowa struggled through the 1930’s Great Depression, along with dust bowl days, unimaginable droughts and economic collapse to expand a state park system for all Iowans.
“By 1937 we lead the nation in the establishment of state parks. Today we compete with one other state for the very bottom in state parks and public lands. We are the most biologically changed place in North America. Roughly 98% of Iowa’s 36 million acres have been altered for agricultural use, cities, and roads.
“There are no old growth forests left to study or enjoy. We drained 98% of our wetlands, cut 80% of the trees, and plowed up 99.9% of our prairies. We have the most polluted surface water, the least species diversity and are at the bottom in environmental spending in the nation. This makes these parks very, very special not only for people but for the remaining critters.
“If we combined all our state parks together in one place we have 55,871 acres or a square just over nine miles on a side, a short day’s walk. The city of Des Moines covers 71,000 acres or a square about ten10 and half miles on a side.Urban sprawl in Iowa alone has increased 50,000 acres in the last ten years. Farmers converted around 50,000 acres of grassland, scrubland and wetlands from 2008 to 2011.”