In southeast Story Co. Near Colo, take U.S. 65 south four miles from U.S. 30 to 280th St. Go four miles east on 280th to Arney Ave., on the county border. About three-quarters of a mile south on Arney there is viewing of the marsh on both sides of the road.

Hendrickson Marsh is an 851-acre area, mostly uplands, and of course the water body itself, when full, of about 250 surface acres. It is shallow water, but still, it is an attractive element for all kinds of migrating birds each spring and fall. In the meantime, lots of fur-bearing animals call Hendrickson home including beaver, muskrats, mink, raccoons, weasels, skunks, and lots of small rodents. Native reptiles and amphibians add to the wildlife mix. There are many resident waterfowl, wood ducks, and others that nest in the grasses of the uplands. Its watershed that provides water is about 8,000 acres.