Interstate 90 in South Dakota

Interstate 90
	Purple Heart Memorial Highway
	I-90 highlighted in red
Route information
	Defined by SDCL §31-4-184
	Maintained by SDDOT
Length	412.76 mi[1] (664.27 km)
Major junctions
West end	I-90 / US 14 at Wyoming state line
	I-190 / US 16 in Rapid City; I-29 in Sioux Falls; I-229 in Sioux Falls
East end	I-90 at Minnesota state line
Location
Counties	Lawrence, Meade, Pennington, Jackson, Jones, Lyman, Brule, Aurora, Davison, Hanson, McCook, Minnehaha
Highway system

In the U.S. state of South Dakota, Interstate 90 (I-90) traverses east–west through the southern half of the state.

Route description

Interstate 90 enters South Dakota in Lawrence County as a four-lane divided highway. It enters concurrently with U.S. Route 14, and passes through the town of Spearfish, where it shares another concurrency with U.S. Route 85 from exit 10 to exit 17. From there it passes several miles north and east of the tourist town of Deadwood before entering Meade County, going just to the west of Sturgis. Another concurrency is with South Dakota Highway 34 from exit 23 at Whitewood to exit 30, the west exit of Sturgis, where there starts a concurrency with SD 79. The freeway generally passes along the north and east edges of the Black Hills.

The route then enters Pennington County, where it passes through the northern edge of Rapid City, gateway to the Black Hills and the nearest passing to Mount Rushmore National Memorial, as well as other scenic attractions including Custer State Park and the Needles Highway. Rapid City is also where the interstate has its westernmost auxiliary route, Interstate 190, which links the interstate to the western edge of the downtown area. SD 79's concurrency ends at exit 61 on the east side of the city. From Rapid City, the route heads east, passing between Box Elder to the south and Ellsworth Air Force Base to the north before heading towards Wall on to Jackson County. Exits 110 and 131 for Badlands National Park to the south (SD 240) are within 15 miles (24 km) either way of the county line. The concurrency for US-14 ends at exit 112 just east of Wall; here US-14 runs due east and will connect to the city of Philip and the capital city of Pierre.

The Lake Francis Case portion of the Missouri River viewed from a rest stop just south of Chamberlain; the pre-interstate Chamberlain Bridge is in the center.

From there, the route passes mostly east–west through Jackson and Jones counties. There are short concurrencies with SD 73 (from the west entering Kadoka) and SD 63 in Jackson County. Interstate 90 crosses the Central Time/Mountain Time Zone boundary on the west edge of Jones County. Then at Murdo, a concurrency begins with U.S. Route 83 at exit 192 and continues to exit 212. It is in Lyman County, at exit 212 in Vivian, that the highway provides its closest link to the capital of Pierre, along US-83, some 35 miles (56 km) north. The road crosses the Missouri River at Lake Francis Case, between the towns of Oacoma and Chamberlain, also crossing into Brule County. I-90 Business Loop runs from exit 260 at Oacoma to downtown Chamberlain across the Missouri River on the nearby Chamberlain Bridge, and returns to I-90 at exit 265. Beginning there is a short concurrency with SD 50 heading to Pukwana, and also in Brule County is another short concurrency with SD 45 starting at Kimball.

I-90 then continues through Aurora County (connecting to White Lake and Plankinton), Davison County (where Mt. Vernon, Mitchell and the Corn Palace are located), Hanson County (Alexandria), and McCook County (Salem). Then comes the state's most populous county, Minnehaha. After passing the communities of Humboldt and Hartford, the interstate intersects the only other major interstate in the state, Interstate 29, at Sioux Falls, the largest city. Just east of Interstate 29 is where Interstate 90 meets the northern terminus of Interstate 229. East of Brandon and northeast of Valley Springs, it then ends its trip through South Dakota of 412 miles (663 km) before entering Minnesota and Rock County, just west of the towns of Beaver Creek and Manley.

Since April 2015 the speed limit is 80 miles per hour (130 km/h), except it is 65 miles per hour (105 km/h) between I-229 and Marion Road in Sioux Falls; or through Rapid City. The speed limit remains 75 miles per hour (121 km/h) between Rapid City and the Wyoming state line.

Codified law

The South Dakota section of I-90 is defined at South Dakota Codified Laws § 31-4-184.[2]

History

I-90 was constructed in the 1970s. The four-lane interstate replaced old highway 16 as the main road connecting Rapid City and Sioux Falls. Much of Old 16 remains intact, however I-90 has absorbed sections and likewise has reshaped the economies of many southern South Dakota towns.[3]

On May 24, 2012, the South Dakota Transportation Commission declared the entire length of I-90 as part of the National Purple Heart Trail, naming it the Purple Heart Memorial Highway.[4]

Removal of exit 66

In the city of Box Elder, exit 66, which crossed South Dakota Highway 435, was closed on October 1, 2003, after a 10-month delay.[5] The exit was closed and removed as a result of the department of transportation's efforts to move traffic away from a potential crash site at the end of the Ellsworth AFB runway. The partial cloverleaf interchange of exit 66 was also demolished shortly thereafter. Exit 67, which was constructed not too long before the closure of exit 66, is now used as the main entrance and exit feeder to the base, and it is less likely to be impacted by a potential crash.[6] Local citizens and officials feared the lack of entrances which access the Ellsworth Air Force Base would cause traffic issues, and moving businesses from near the old exit would cause some to close and affect tax revenue. Land near exit 66 began to be purchased in 2004, including the former McDonald's property.[7]

Exit list

County	Location	mi[8]	km	Exit	Destinations	Notes
Lawrence		0.00	0.00		I-90 / US 14 west – Gillette	Continuation into Wyoming
		2.25	3.62	2	McNenny State Fish Hatchery
	Spearfish	8.96	14.42	8	McGuigan Road – Spearfish, Black Hills National Forest
		10.26	16.51	10	I-90 Bus. east (North Avenue) / US 85 north – Spearfish, Belle Fourche	Western end of US 85 concurrency
		12.32	19.83	12	Jackson Boulevard – Spearfish, Black Hills State University
		14.42	23.21	14	I-90 Bus. west / US 14A (27th Street) / Black Hills National Forest Scenic Byway – Spearfish Canyon
		18.16	29.23	17	US 85 south – Deadwood, Lead	Eastern end of US 85 concurrency
	Whitewood	23.73	38.19	23	SD 34 west – Whitewood, Belle Fourche	Western end of SD 34 concurrency
Meade	Sturgis	30.28	48.73	30	I-90 Bus. / SD 34 east / SD 79 north (Lazelle Street) / US 14A west – Sturgis, Deadwood, Lead	Eastern end of SD 34 concurrency; western end of SD 79 concurrency
	Sturgis	32.41	52.16	32	I-90 Bus. west (Junction Avenue) – Sturgis	Serves Sturgis Regional Hospital
		34.81	56.02	34	Black Hills National Cemetery
		37.01	59.56	37	Pleasant Valley Road
	Tilford	40.20	64.70	40	Tilford Road, Bethlehem Road – Tilford
	Piedmont	44.66	71.87	44	Bethlehem Road – Piedmont
	Piedmont	46.14	74.26	46	Elk Creek Road – Piedmont, Summerset
	Summerset	48.43	77.94	48	Stagebarn Canyon Road – Summerset
	Black Hawk	52.38	84.30	52	I-90 Bus. east (Peaceful Pines Road) – Black Hawk, Rapid City
Pennington	Rapid City	55.66	89.58	55	Deadwood Avenue – Rapid City
		57.76	92.96	57	I-190 south / US 16 west – Rapid City, Mount Rushmore, Black Hills National Forest	Trumpet interchange; I-190 exits 1A–B
		58.31	93.84	58	Haines Avenue – Rapid City	Single-point urban interchange (SPUI)
		59.19	95.26	59	La Crosse Street – Rapid City
		60.48	97.33	60	I-90 Bus. west (North Street) – Rapid City	SPUI
		61.84	99.52	61	US 16 Truck / SD 79 south – Rapid City, Mount Rushmore, Crazy Horse	Eastern end of SD 79 concurrency; SPUI
	Box Elder	63.42	102.06	63	Box Elder, Ellsworth AFB Commercial Gate	Eastbound exit and westbound entrance
		66.17	106.49	66	SD 435 – Ellsworth AFB	Closed October 1, 2003[6]
		67.15	108.07	67	Liberty Boulevard – Box Elder, Ellsworth AFB Main Gate	Signed as exits 67A (south) and 67B (north) eastbound, Partial cloverleaf interchange
	New Underwood	78.29	126.00	78	161st Avenue – New Underwood
		84.24	135.57	84	167th Avenue
		88.23	141.99	88	171st Avenue	Eastbound exit and westbound entrance
		90.25	145.24	90	173rd Avenue
	Wasta	98.14	157.94	98	Base Line Road – Wasta	Partial cloverleaf interchange
		101.23	162.91	101	Jensen Road	Partial cloverleaf interchange
		107.85	173.57	107	Cedar Butte Road
	Wall	109.82	176.74	109	I-90 Bus. east / W. 4th Avenue – Wall
	Wall	110.98	178.60	110	I-90 Bus. west (Glenn Street) / SD 240 east (Badlands Loop) – Wall, Badlands
		112.01	180.26	112	US 14 east – Philip, Pierre	Eastern end of US 14 concurrency, trumpet interchange
		116.94	188.20	116	239th Street
		121.98	196.31	121	Big Foot Road
Jackson		127.75	205.59	127	206th Avenue	Exit not signed for this road
		131.26	211.24	131	SD 240 west (Badlands Loop) – Interior, Badlands
		143.29	230.60	143	SD 73 north – Philip	Western end of SD 73 concurrency
	Kadoka	150.20	241.72	150	I-90 Bus. east / SD 73 south – Kadoka	Eastern end of SD 73 concurrency
	Kadoka	152.42	245.30	152	I-90 Bus. west (South Creek Road) – Kadoka
	Belvidere	163.03	262.37	163	SD 63 south – Belvidere	Western end of SD 63 concurrency
		170.31	274.09	170	SD 63 north – Midland	Eastern end of SD 63 concurrency
		172.50	277.61	172	Stamford Road	Exit not signed for this road
Jones	Okaton	177.48	285.63	177	Farm exit	Exit not signed
	Okaton	183.48	295.28	183	Okaton
	Murdo	191.14	307.61	191	I-90 Bus. east – Murdo
	Murdo	192.64	310.02	192	I-90 Bus. west / US 83 south – Murdo, White River	Western end of US 83 concurrency
	Draper	201.13	323.69	201	Draper
		208.11	334.92	208	CR S10	Exit not signed for this road
Lyman		212.80	342.47	212	US 83 north / SD 53 – Pierre, Fort Pierre	Eastern end of US 83 concurrency
	Vivian	214.25	344.80	214	Vivian
		220.31	354.55	220	300th Avenue	Exit not signed for this road
	Presho	225.38	362.71	225	I-90 Bus. east – Presho
	Presho	226.39	364.34	226	I-90 Bus. west / US 183 south – Presho, Winner
	Kennebec	235.42	378.87	235	SD 273 north – Kennebec
	Lyman	241.90	389.30	241	321st Avenue	Exit not signed for this road
	Reliance	248.77	400.36	248	To SD 47 north – Reliance	Actual SD 47 route runs parallel to the north along I-90 between exits 248 and 251 and does not connect to this interchange
		251.08	404.07	251	SD 47 south – Gregory, Winner	Actual SD 47 route intersects I-90 at this interchange
	Oacoma	260.47	419.19	260	I-90 Bus. east (Dougan Avenue) – Oacoma, Chamberlain
Missouri River		262.22	422.00	Lewis and Clark Memorial Bridge over Lake Francis Case
Brule	Chamberlain	263.53	424.11	263	S. Main Street – Chamberlain	Partial cloverleaf interchange
	Chamberlain	265.85	427.84	265	I-90 Bus. west / SD 50 west – Chamberlain	Western end of SD 50 concurrency
	Pukwana	272.63	438.76	272	SD 50 east – Pukwana	Eastern end of SD 50 concurrency
	Kimball	284.05	457.13	284	SD 45 north – Kimball	Western end of SD 45 concurrency
		289.22	465.45	289	SD 45 south – Platte	Eastern end of SD 45 concurrency
Aurora	White Lake	296.68	477.46	296	White Lake
	Plankinton	308.25	496.08	308	Plankinton
		310.48	499.67	310	US 281 – Stickney, Aberdeen, Huron
Davison	Mount Vernon	319.43	514.07	319	Mount Vernon
		325.42	523.71	325	Betts Road
	Mitchell	330.41	531.74	330	I-90 Bus. east / SD 37 north (S. Ohlman Street) – Mitchell, Huron	Western end of SD 37 concurrency
	Mitchell	332.17	534.58	332	I-90 Bus. west / SD 37 south (S. Burr Street north) – Mitchell, Parkston	Eastern end of SD 37 concurrency
Hanson		335.42	539.81	335	Riverside Road
	Alexandria	344.01	553.63	344	SD 262 east – Fulton, Alexandria
		350.05	563.35	350	SD 25 – Emery, Farmer
McCook		353.98	569.68	353	Spencer, Emery
		357.99	576.13	357	Bridgewater, Canova
	Salem	364.01	585.82	364	US 81 – Salem, Yankton, Madison
		368.05	592.32	368	Canistota
		374.02	601.93	374	Montrose
Minnehaha	Humboldt	379.63	610.96	379	SD 19 – Humboldt, Madison
	Hartford	387.46	623.56	387	Hartford
	Hartford	390.21	627.98	390	SD 38 – Hartford, Buffalo Ridge	Partial cloverleaf interchange
	Sioux Falls	395.46	636.43	395	Marion Road – Sioux Falls	Partial cloverleaf interchange
		396.52	638.14	396	I-29 – Fargo, Sioux City	Signed as exits 396A (southbound) and 396B (northbound); cloverleaf interchange; I-29 exits 84A-B
		399.54	643.00	399	SD 115 (Cliff Avenue) – Airport	Former I-90 Business Spur; SPUI
		400.58	644.67	400	I-229 south – Sioux Falls	Half-clover interchange, I-229 exits 10A–B northbound; no access to or from CR 125 (476th Street)
		402.55	647.84	402	U.S. Geological Survey, EROS Data Center	Future northern terminus of SD 100
	Brandon	406.54	654.26	406	SD 11 – Corson, Brandon
	Valley Springs	410.57	660.75	410	Valley Springs, Garretson
		412.76	664.27		I-90 east – Albert Lea	Continuation into Minnesota
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Closed/former Concurrency terminus Incomplete access

gollark: Or 1278.

gollark: It's bigger than 5005...?

gollark: Aeons look very cool, so we must all accumulate 5006 of them.

gollark: Might be deliberate.

gollark: I warn you: any aeons I breed will be messy.

References

"Route Log- Main Routes of the Eisenhower National System of Interstate and Defense Highways - Table 1". Federal Highway Administration. Retrieved 4 October 2014.
"South Dakota Codified Laws - § 31-4-184". South Dakota Legislature. Retrieved 2008-06-25.
Hunhoff, Bernie. "Old Highway 16". South Dakota Magazine. South Dakota Magazine. Retrieved 10 February 2020.
Jacobs, Travis (August 12, 2017). "Purple Heart Memorial Highway". KIKN. Retrieved June 18, 2018.
Rietman, Diane (December 5, 2002). "Agreement leaves Exit 66 open until next fall". The Rapid City Journal. Retrieved June 8, 2017.
Daly, Dan (October 1, 2003). "Exit 66 now road to nowhere". The Rapid City Journal. Retrieved June 8, 2017.
Aust, Scott (September 3, 2004). "Box Elder Officials: Exit 66 land sale pending". The Rapid City Journal. Retrieved June 8, 2017.
"Pavement Condition Monitoring". South Dakota Department of Transportation. Retrieved July 11, 2015.

External links

Media related to Interstate 90 in South Dakota at Wikimedia Commons

Interstate 90
Previous state: Wyoming	South Dakota	Next state: Minnesota

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[;fhwa-1] "Route Log- Main Routes of the Eisenhower National System of Interstate and Defense Highways - Table 1". Federal Highway Administration. Retrieved 4 October 2014.

[2] "South Dakota Codified Laws - § 31-4-184". South Dakota Legislature. Retrieved 2008-06-25.

[3] Hunhoff, Bernie. "Old Highway 16". South Dakota Magazine. South Dakota Magazine. Retrieved 10 February 2020.

[4] Jacobs, Travis (August 12, 2017). "Purple Heart Memorial Highway". KIKN. Retrieved June 18, 2018.

[5] Rietman, Diane (December 5, 2002). "Agreement leaves Exit 66 open until next fall". The Rapid City Journal. Retrieved June 8, 2017.

[exit66closed-6] Daly, Dan (October 1, 2003). "Exit 66 now road to nowhere". The Rapid City Journal. Retrieved June 8, 2017.

[7] Aust, Scott (September 3, 2004). "Box Elder Officials: Exit 66 land sale pending". The Rapid City Journal. Retrieved June 8, 2017.

[8] "Pavement Condition Monitoring". South Dakota Department of Transportation. Retrieved July 11, 2015.