I-90 Speedway is a 3/8 mile high-banked dirt oval located between Hartford and Humboldt, South Dakota. The track is banked 20 degrees in the turns.
Hartford, SD 57033
1913 Highway 14 Bypass
Brookings, SD 57006
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This is another case of frustrating behavior by online mapping services. The track is actually located on the north side of SD-38, between 460th Avenue and 259th Street, but the best intersection I can come up with is this one, on the wrong side of SD-38. Please look at the terraserver view or else the low-res imagery associated with Google to see where the track really is.
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