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Interstate 229 or I -229 is a short Interstate Highway in the U.S. state of South Dakota. The highway forms the eastern bypass of the state’s largest city, Sioux Falls. The highway is 18 kilometers long.
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I-229 to the south of Sioux Falls.
The highway begins on the south side of town, where the road exits from Interstate 29. The highway then has 2×2 lanes, and initially runs to the northeast. New residential areas are being developed in this area. On the southeast side of the city, the highway has 2×3 lanes. One then passes with 2×2 lanes along the east side of the city, due north. North of the city, the highway connects to Interstate 90, which runs from Rapid City to Chicago.
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I-229 was constructed at the same time as I-29 and I-90 around Sioux Falls and opened to traffic about 1962.
A study was completed in 2017 to determine which measures are necessary in the long term. Proposed improvements included partial widening to 2×3 lanes between 10th Street and 26th Street and reconstruction of the alignment to allow for 65 mph.
The highway is not exactly busy. 23,100 vehicles arrive daily from I-29, increasing to 43,380 vehicles on the southeast side of the city. Then it drops again to 16,330 vehicles off I-90.