In southeast Mahaska Co., about five miles east of Oskaloosa alongside Hwy. 92. A parking area for the northeast side of the marsh is at T-60/Snyder Rd. A parking area on the southeast side of the marsh is just up Snyder Rd., on the right. The west end of the marsh can be viewed by walking in that direction from the end of the southside parking area, a short distance through grass, although there is no actual trail.