The Rapid City Region encompasses the counties of Butte, Custer, Fall River, Harding, portions of Jackson, Lawrence, Meade, Pennington, Perkins, most of Shannon, and a portion of Ziebach. It is divided into three areas with local offices in Belle Fourche, Custer and Rapid City.

Region Engineer:
PO Box 1970
Rapid City, SD 57709-1970
Physical Address: 2300 Eglin St.
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Todd Seaman
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(605) 394-2244
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Region Operations Engineer:
PO Box 1970
Rapid City, SD 57709-1970
Physical Address: 2300 Eglin St.
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Tom Horan
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(605) 394-2244
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Belle Fourche Area Engineer:
10921 SD Highway 34
Belle Fourche, SD 57717-0786
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Mike Carlson
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(605) 892-2872
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Custer Area Engineer:
PO Box 431
Custer, SD 57730-0431
Physical Address: 1/2 Mi. S on Hwy 385
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Rich Zacher
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(605) 673-4948
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Rapid City Area Engineer:
PO Box 1970
Rapid City, SD 57709-1970
Physical Address: 2300 Eglin St.
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Gary Engel
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(605) 394-2248
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