Ohio Division of Wildlife naturalist Jim McCormac says that's evidence of good health for the Scioto River under the span.
A $35.5 million project narrowed the river for the creation of a 33-acre park with 800 trees and 75,000 plants.
McCormac says that allows for more insects in the area, and the spiders followed their food.
Not so much of an “infestation” as opportunist predators taking advantage of increased prey population. That species is actually quite beneficial in keeping the insect population in check.