(Lamar Hoethe, elevated 16-sided, IA-25-04) W. of Urbandale, Walnut Township, Dallas County, IA. US6 W. 1.9 miles from jct with I35 on the W. side of Urbandale, N. on 142nd St. 0.8 miles to the house on the W. side of the road at 3514 142nd St. (4-28-04, N41° 37.590', W93° 48.920')