Total Bridges
5,905
Public highway bridges in South Dakota
State profile · Above national median SD
South Dakota bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in South Dakota — drawn straight from the FHWA National Bridge Inventory.
- 5,905
- Public bridges
- 31.9%
- Good condition
- 16.2%
- Poor condition
- 16.2%
- Structurally deficient
Good Condition
31.9%
1,885 bridges rated 7-9
-18.1pp vs 50% benchmark
Poor Condition
16.2%
959 bridges rated 0-4
Structurally Deficient
16.2%
959 bridges flagged for repair priority
9.2pp vs national avg 7.0%
South Dakota vs national bridge condition
South Dakota — Good condition share 31.9%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
South Dakota — Structurally deficient share 54.1%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — South Dakota (FHWA NBI)
Counties (66)
Aurora 61 Beadle 153 Bennett 15 Bon Homme 126 Brookings 234 Brown 170 Brule 38 Buffalo 25 Butte 143 Campbell 15 Charles Mix 103 Clark 21 Clay 94 Codington 74 Corson 49 Custer 95 Davison 125 Day 37 Deuel 72 Dewey 28 Douglas 44 Edmunds 20 Fall River 80 Faulk 46 Grant 205 Gregory 51 Haakon 69 Hamlin 62 Hand 126 Hanson 62 Harding 49 Hughes 41 Hutchinson 161 Hyde 23 Jackson 89 Jerauld 35 Jones 37 Kingsbury 35 Lake 79 Lawrence 136 Lincoln 207 Lyman 114 Marshall 39 McCook 98 McPherson 14 Meade 217 Mellette 28 Miner 64 Minnehaha 395 Moody 87 Oglala Lakota 34 Pennington 350 Perkins 60 Potter 24 Roberts 157 Sanborn 53 Spink 176 Stanley 37 Sully 31 Todd 24 Tripp 90 Turner 143 Union 172 Walworth 34 Yankton 99 Ziebach 30
South Dakota vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below South Dakota on the same metric.
66
Guam
15.25% top marginal rate
54
West Virginia
16.02% top marginal rate
46
South Dakota
16.24% top marginal rate
19
Iowa
20.01% top marginal rate
78
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in South Dakota
Six lowest-condition bridges in South Dakota, ranked by composite NBI rating. Each is inspected at least every 24 months.
483 AVENUE
Structurally DeficientOver: WHETSTONE RV
4.8E & 3.2N MILBANK, Grant, SD
Built 1962 Load: 0.9 t ADT: 25
202ND ST.
Structurally DeficientOver: BEAR BUTTE CK
5.3E BEAR BUTTE, Meade, SD
Built 2000 Load: 0.9 t ADT: 50
45980 303 ST.
Structurally DeficientOver: VERMILLION RV
6S & 7.8E IRENE, Clay, SD
Built 1909 Load: 1.8 t ADT: 15
460th Avenue
Structurally DeficientOver: Big Coulee Creek
4S & 2W of Peever, Roberts, SD
Built 1950 Load: 2.2 t ADT: 22
197TH ST
Structurally DeficientOver: TURTLE CK
1N & 1E ST LAWRENCE, Hand, SD
Built 1925 Load: 2.5 t ADT: 25
242 ST
Structurally DeficientOver: CK
1.8E 11.0N PLANKINTON, Aurora, SD
Built 1917 Load: 2.7 t ADT: 101
All Bridges in South Dakota
370 AVE
UnknownOver: I090
AURORA & BRULE CO LINE, Aurora, SD
Built 1965 ADT: 8,090
252ND ST (CR-34)
UnknownOver: I090
2.6 W WHITE LAKE INTERCH, Aurora, SD
Built 1964 ADT: 8,090
I090 P
UnknownOver: I090
WHITE LAKE INTERCHANGE, Aurora, SD
Built 1964 ADT: 8,090
377 AVE
UnknownOver: I090
3.0 E WHITE LAKE INTERCH, Aurora, SD
Built 1965 ADT: 8,120
380 AVE (FAS 6119)
UnknownOver: I090
6.0 E WHITE LAKE INTERCH, Aurora, SD
Built 1965 ADT: 8,120
384 AVE
UnknownOver: I090
2.0 W PLANKINTON INTERCH, Aurora, SD
Built 1965 ADT: 8,120
SD258
UnknownOver: I090
PLANKINTON INTERCHANGE, Aurora, SD
Built 1965 ADT: 8,490
US281
UnknownOver: I090
US 281 INTERCHANGE, Aurora, SD
Built 1965 ADT: 9,890
392 AVE
UnknownOver: I090
2 W EAST CO LINE, Aurora, SD
Built 1965 ADT: 9,890
RCP&E RR
UnknownOver: JERSEY AVE.
JERSEY AVE., Beadle, SD
Built 1907 ADT: 4,220
COMMERCIAL ROUTE
UnknownOver: US014
1.4 E JCT SD 37, Beadle, SD
Built 1960 ADT: 2,075
US014 W
UnknownOver: US014 B
1N 1.6W BROOKINGS, Brookings, SD
Built 1970 ADT: 7,718
RCP&E RR
UnknownOver: 6TH AVENUE
6TH AVENUE, Brookings, SD
Built 1936 ADT: 330
I029 S
UnknownOver: 197 ST
1 S DEUEL CO LINE, Brookings, SD
Built 1970 ADT: 46
I029 S
UnknownOver: 201 ST
3 N SD 30 INTERCH, Brookings, SD
Built 1970 ADT: 39
I029 S
UnknownOver: 8TH ST S, RC,P&E RR
0.9 S US 14 INTERCH, Brookings, SD
Built 1966 ADT: 20
I029 N
UnknownOver: 197 ST
1 S DEUEL CO LINE, Brookings, SD
Built 1970 ADT: 46
I029 N
UnknownOver: 201 ST
3 N SD 30 INTERCH, Brookings, SD
Built 1970 ADT: 39
SD030
UnknownOver: I029
SD 30 INTERCHANGE, Brookings, SD
Built 1970 ADT: 7,560
207 ST
UnknownOver: I029
3 S SD 30 INTERCH, Brookings, SD
Built 1970 ADT: 9,960
209 ST
UnknownOver: I029
2 N US14 BY PASS, Brookings, SD
Built 1970 ADT: 9,960
US014 B
UnknownOver: I029
US14 BY-PASS INTERCHANGE, Brookings, SD
Built 1966 ADT: 9,960
US014
UnknownOver: I029
US 14 & I 29 INTERCHANGE, Brookings, SD
Built 2017 ADT: 10,990
I029 N
UnknownOver: 8TH ST S, RC,P&E RR
0.9 S US 14 INTERCH, Brookings, SD
Built 1966 ADT: 20
20th ST S
UnknownOver: I029
2 S US 14 INTCH, Brookings, SD
Built 2022 ADT: 12,240
215 ST
UnknownOver: I029
3 S US 14 INTERCH, Brookings, SD
Built 1966 ADT: 12,240
SD324
UnknownOver: I029
SD 324 INTERCHANGE, Brookings, SD
Built 1966 ADT: 12,240
219 ST
UnknownOver: I029
1 N MOODY CO LINE, Brookings, SD
Built 1966 ADT: 12,630
SECOND STREET
UnknownOver: FIRST AVE NW
0.6 N JCT US12 - ABERDEEN, Brown, SD
Built 2003 ADT: 545
SECOND STREET
UnknownOver: RAILROAD AVE SW
0.4 N JCT US12 - ABERDEEN, Brown, SD
Built 2003 ADT: 4,560
I090
UnknownOver: MAIN ST, R&W RR
CHAMBERLAIN INTERCHANGE, Brule, SD
Built 1974 ADT: 1,355
I090 WB OFF RAMP
UnknownOver: MAIN ST, R&W RR
CHAMBERLAIN INTERCH, Brule, SD
Built 1974 ADT: 1,355
I090 WB OFF RAMP
UnknownOver: I090
0.9 SE CHAMB INTERCHANGE, Brule, SD
Built 1974 ADT: 7,250
SD050
UnknownOver: I090
E CHAMBERLAIN INTERCHANGE, Brule, SD
Built 1964 ADT: 7,260
348 AVE
UnknownOver: I090
2.5 W SD 50 INTERCH, Brule, SD
Built 1964 ADT: 7,260
SD050
UnknownOver: I090
PUKWANA INTERCHANGE, Brule, SD
Built 1964 ADT: 7,170
I090 W
UnknownOver: 356 AVE
5.5 E SD 50 INTERCH, Brule, SD
Built 1964 ADT: 80
I090 E
UnknownOver: 356 AVE
5.5 E SD 50 INTERCH, Brule, SD
Built 1964 ADT: 80
I090 W
UnknownOver: 251 ST
2.9 W SD 45 N INTERCH, Brule, SD
Built 2006 ADT: 345
I090 E
UnknownOver: 251 ST
2.9 W SD 45 N INTERCH, Brule, SD
Built 2007 ADT: 345
I090 W
UnknownOver: SD045
SD45N INTERCHANGE, Brule, SD
Built 1963 ADT: 1,541
I090 E
UnknownOver: SD045
SD45N INTERCHANGE, Brule, SD
Built 1963 ADT: 1,541
365 AVE
UnknownOver: I090
2.0 W SD 45S INTERCH, Brule, SD
Built 1965 ADT: 7,670
SD045
UnknownOver: I090
SD 45 SOUTH INTERCHANGE, Brule, SD
Built 1965 ADT: 8,090
BURL NORTHERN RR
UnknownOver: COUNTY ROAD
5S 3.8W WILLOW LAKE, Clark, SD
Built 1929 ADT: 78
SD050
UnknownOver: SD 50 WL, SO DAK OWNED R
2 NW OF VERMILLION, Clay, SD
Built 1981 ADT: 1,832
SD050 E
UnknownOver: SD050 L
EAST EDGE OF VERMILLION, Clay, SD
Built 1977 ADT: 4,518
I029 S
UnknownOver: US212
US 212 & I 29 INTERCHANGE, Codington, SD
Built 1970 ADT: 12,968
SD020
UnknownOver: I029
I 29 & SD 20 INTERCHANGE, Codington, SD
Built 1974 ADT: 6,600
161 ST
UnknownOver: I029
4 S SD 20 INTERCH, Codington, SD
Built 1974 ADT: 7,360
Showing 1-50 of 5,905 bridges
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |