Interstate 229 (South Dakota)

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.

Interstate 229
I-229 highlighted in red
Route information
Auxiliary route of I-29
Defined by SDCL §31-4-210
Maintained by SDDOT
Length	11.33 mi[1] (18.23 km)
Existed	1966–present
Major junctions
South end	I-29 in Sioux Falls
North end	I-90 / CR 125 near Sioux Falls
Location
Counties	Lincoln, Minnehaha
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future South Dakota Highways Interstate U.S. State ← SD 224 → SD 230

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.[2]

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.[3]

Codified law

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

Exit list

County	Location	mi	km	Exit	Destinations	Notes
Lincoln	Sioux Falls	0.00	0.00	1A–B	I-29 – Sioux City, Sioux Falls	Southern terminus; signed as left exit 1A (south) and 1B (north) southbound; I-29 exit 75; tri-stack interchange; originally trumpet interchange
		1.43	2.30	1C	Louise Avenue
Minnehaha		2.57	4.14	2	Western Avenue
		3.58	5.76	3	I-229 Dwtn. north / SD 115 (Minnesota Avenue)	Southern terminus of I-229 Dwtn.
		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 Dwtn. south / SD 42 (10th Street)	Northern terminus of I-229 Dwtn.; former 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 – Albert Lea, Rapid City	Northern terminus; signed as exits 10A (west) & 10B (east); I-90 exit 400; half-cloverleaf interchange
	​				CR 125 (476th Avenue)	Continuation beyond I-90; no access between I-90 and CR 125
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

Downtown Loop

Interstate 229 Downtown Loop
Location	Sioux Falls, South Dakota
Length	4.3 mi[5] (6.9 km)

Interstate 229 Downtown Loop (I-229 Dwtn.) is an off-Interstate business route though Sioux Falls. It begins at the SD 115 interchange along I-229 in the southern part of the city. It heads north along Minnesota Avenue toward the downtown area. At West 11th Street, the loop turns to the east and joins SD 42; west 10th Street forms the westbound half of a one-way couplet. I-229 Dwtn. and SD 42 cross the Big Sioux River just upstream of Falls Park and shortly thereafter, the two one-way directions join and then travel along East 10th Street. They pass through a retail district and the South Dakota School for the Deaf. The Downtown Loop ends at a single point urban interchange with I-229 in the eastern part of the city. SD 42 continues east past the interchange.[5]

Major intersections

The entire route is in Sioux Falls, Minnehaha County.

mi[5]	km	Destinations	Notes
0.00	0.00	SD 115 south (Minnesota Avenue south) / I-229	Southern terminus; southern end of SD 115 concurrency; I-229 exit 3; road continues as SD 115 (Minnesota Avenue).
2.4– 2.5	3.9– 4.0	SD 115 north (Minnesota Avenue north) / I-29 Dwtn. / SD 42 (11th Street)	11th Street is one-way street, inbound access only; southern end of SD 42 concurrency; eastern terminus of I-29 Dwtn. EB.
		I-29 Dwtn. / SD 42 west (10th Street west) / SD 115 north (Minnesota Avenue north) – Arena, Convention Center	10th Street is one-way street, outbound access only; northern end of SD 115 concurrency; eastern terminus of I-29 Dwtn. WB.
4.3	6.9	SD 42 east (10th Street east) / I-229	Northern terminus; single-point urban interchange; northern end of SD 42 concurrency; I-229 exit 6; road continues east as SD 42 (10th Street).
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

References

1. "Route Log and Finder List - Interstate System: Table 2". FHWA. Retrieved 2007-10-03.
2. Callison, Jill (2006-11-18). "Paving Truck Ends Era of State's Gravel Interstate". Argus Leader. p. 1A. Retrieved 2011-05-12.
3. Google (2011-09-07). "I-229 SD" (Map). Google Maps. Google. Retrieved 2011-09-07.
4. "South Dakota Codified Laws - § 31-4-210". South Dakota Legislature. Retrieved 2008-06-25.
5. "Overview of I-229 Downtown Loop". Google Maps. Google, Inc. Retrieved June 9, 2017.

External links

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