Interstate 229 (South Dakota)

Interstate 229
Route information
Defined by SDCL §31-4-210
Maintained by SDDOT
Length:	11.33 mi (18.23 km)
Existed:	1966 – present
Major junctions
South end:	I-29 in Sioux Falls
North end:	I-90 / CR 125 near Sioux Falls
Highway system
Interstate Highway System Main Auxiliary Suffixed Business South Dakota Highways ← SD 224 SD 230 →

Interstate 229 (I-229) in South Dakota runs just more than ten miles (16 km) mostly within the city limits of Sioux Falls, the largest city in the state. It runs from a trumpet interchange Interstate 29 in the southern extremities of Sioux Falls to Interstate 90 just north of Sioux Falls. In between, the interstate travels through parts of southern and eastern Sioux Falls.

Since its initial construction, I-229 had the distinction of being the only Interstate in the country that transitioned directly from a four-lane concrete road to a two-lane gravel road. That ended in 2006 with the paving of 476th Avenue, the continuation of the highway beyond its northern terminus at the interchange with I-90.

Route description

I-229 begins at a trumpet interchange with I-29 just south of Globe University. I-229 travels to the northeast, passing north of the Avera Heart Hospital of South Dakota before going through several parks. A few miles to the northeast, just after the Cliff Avenue exit I-229 turns north and passes through metropolitan Sioux Falls. I-229 terminates at a partial cloverleaf interchange with I-90.

Codified law

Legally, the route of I-229 is defined at South Dakota Codified Laws § 31-4-210.

Exit list

County	Location	mi	km	Exit	Destinations	Notes
Lincoln	Sioux Falls	0.00	0.00	1A/B	I-29	Southbound exit and northbound entrance; southern terminus & signed as exits 1A (south) and 1B (north); I-29 exit 75
		1.43	2.30	1C	Louise Avenue
Minnehaha		2.57	4.14	2	Western Avenue
		3.58	5.76	3	I-229 Bus. north / SD 115 (Minnesota Avenue)
		4.63	7.45	4	Cliff Avenue
		5.59	9.00	5	26th Street	Also serves 33rd Street; southbound exit and entrance at Yeager Road
		7.15	11.51	6	I-229 Bus. south / SD 42 (10th Street)	Old US 16; single-point urban interchange
		8.35	13.44	7	Rice Street – Brandon
		9.95	16.01	9	Benson Road
	​	11.33	18.23	10	I-90 CR 125 (476th Avenue)	Northbound exit and southbound entrance; northern terminus & signed as exits 10A (west) & 10B (east); roadway continues as CR 125; no access from 229 south to 90 nor from 90 to CR 125 north; I-90 exit 400
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

External links

• Photos of Interstate 229 (South Dakota)
• Interchange Improvements for northern end of I-229