(41' x 11', pedestrian, 15-13-a) across a ravine in Twin Lakes State Park SW of Manson, section 28, Sherman Township, Calhoun County, IA. IA7 W. 4.0 miles from jct with CR N65 at Manson, S. on IA124 1.2 miles, E. on N Twin Lakes Rd. 1.5 miles to the bridge on the left side of the road. (10-22-00, N42° 29.531', W94° 37.835')