Total Bridges
5,905
Public highway bridges in South Dakota
State profile · Above median Poor share
South Dakota bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in South Dakota, based on the FHWA National Bridge Inventory.
- 5,905
- Public bridges
- 31.9%
- Good condition
- 16.2%
- Poor condition
Data updated May 2026
Good Condition
31.9%
1,885 bridges rated 7-9
-18.1pp vs 50% benchmark
Poor Condition
16.2%
959 bridges whose lowest applicable component is rated 0-4
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 - Poor-condition share 54.1%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
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 by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below South Dakota on the same metric.
GU
Guam
15.25% top marginal rate
WV
West Virginia
16.02% top marginal rate
SD
South Dakota
16.24% top marginal rate
IA
Iowa
20.01% top marginal rate
VI
Virgin Islands
29.17% top marginal rate
Bridges Needing Most Attention in South Dakota
Six lowest-condition bridges in South Dakota, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
483 AVENUE
PoorOver: WHETSTONE RV
4.8E & 3.2N MILBANK, Grant, SD
Built 1962 Load: 0.9 t ADT: 25
202ND ST.
PoorOver: BEAR BUTTE CK
5.3E BEAR BUTTE, Meade, SD
Built 2000 Load: 0.9 t ADT: 50
45980 303 ST.
PoorOver: VERMILLION RV
6S & 7.8E IRENE, Clay, SD
Built 1909 Load: 1.8 t ADT: 15
460th Avenue
PoorOver: Big Coulee Creek
4S & 2W of Peever, Roberts, SD
Built 1950 Load: 2.2 t ADT: 22
197TH ST
PoorOver: TURTLE CK
1N & 1E ST LAWRENCE, Hand, SD
Built 1925 Load: 2.5 t ADT: 25
242 ST
PoorOver: CK
1.8E 11.0N PLANKINTON, Aurora, SD
Built 1917 Load: 2.7 t ADT: 101
All Bridges in South Dakota
I090 W
UnknownOver: SD240
SD240 & WALL INTERCHANGE, Pennington, SD
Built 1968 ADT: 5,133
I090 E
UnknownOver: SD240
SD240 & WALL INTERCHANGE, Pennington, SD
Built 1968 ADT: 1,570
US014 WB OFF/90 E2
UnknownOver: I090
US 14 & I 90 INTERCHANGE, Pennington, SD
Built 1974 ADT: 6,270
US014 E
UnknownOver: I090
US 14 & I 90 INTERCHANGE, Pennington, SD
Built 1974 ADT: 6,270
I090 E
UnknownOver: 195 AVE
4.4 SE US 14 INTERCHANGE, Pennington, SD
Built 1974 ADT: 32
I090 W
UnknownOver: 195 AVE
4.4 SE US 14 INTERCHANGE, Pennington, SD
Built 1974 ADT: 32
I090 W
UnknownOver: BIG FOOTE RD (FAS)
9.4 SE US 14 INTERCHANGE, Pennington, SD
Built 1973 ADT: 56
I090 E
UnknownOver: BIG FOOTE RD (FAS)
9.4 SE US 14 INTERCHANGE, Pennington, SD
Built 1973 ADT: 56
IRR US012
UnknownOver: I029
US 12 & I 29 INTERCHANGE, Roberts, SD
Built 1978 ADT: 6,050
IRR 144 ST
UnknownOver: I029
GRANT CO LINE, Roberts, SD
Built 1979 ADT: 6,400
IRR I029 S
UnknownOver: 458 AVE (FAS)
1.6 SW SD 15 INTERCH, Roberts, SD
Built 1977 ADT: 1,400
IRR I029 N
UnknownOver: 458 AVE (FAS)
1.6 SW SD 15 INTERCH, Roberts, SD
Built 1977 ADT: 1,400
IRR SD015
UnknownOver: I029
I 29 & SD 15 INTERCHANGE, Roberts, SD
Built 1977 ADT: 5,340
IRR I029 S
UnknownOver: 460 AVE
1.9 NE SD 15 INTERCH, Roberts, SD
Built 1977 ADT: 166
IRR I029 N
UnknownOver: 460 AVE
1.9 NE SD 15 INTERCH, Roberts, SD
Built 1977 ADT: 166
IRR I029 S
UnknownOver: 124 ST, GOODWILL CK
5.1 S SD 10 INTERCH, Roberts, SD
Built 1982 ADT: 145
IRR EASTMAN RD
UnknownOver: I029
3 S SD 10 INTERCH, Roberts, SD
Built 1982 ADT: 4,890
IRR I029 N
UnknownOver: 124 ST, GOODWILL CK
5.1 S SD 10 INTERCH, Roberts, SD
Built 1982 ADT: 145
IRR I029 S
UnknownOver: 127 ST (FAS)
PEEVER INTERCHANGE, Roberts, SD
Built 1978 ADT: 1,298
IRR 129 ST
UnknownOver: I029
2 S PEEVER INTERCH, Roberts, SD
Built 1978 ADT: 5,340
IRR COUNTY RD
UnknownOver: I029
4 N SD 15 INTERCH, Roberts, SD
Built 1978 ADT: 5,340
IRR SD010
UnknownOver: I029
SD 10 & I29 INTERCHANGE, Roberts, SD
Built 1982 ADT: 4,960
IRR I029 N
UnknownOver: 127 ST (FAS)
PEEVER INTERCHANGE, Roberts, SD
Built 1978 ADT: 1,298
IRR 117 ST
UnknownOver: I029
2.0 N SD 10 & I29 INTERCH, Roberts, SD
Built 1982 ADT: 4,960
IRR 113 ST
UnknownOver: I029
6.5 NE SD 10 INTERCH, Roberts, SD
Built 1980 ADT: 4,960
IRR I029 S
UnknownOver: 110 ST (FAS)
4.4 S SD 127 INTERCHANGE, Roberts, SD
Built 1980 ADT: 258
IRR I029 N
UnknownOver: 110 ST (FAS)
4.4 S SD 127 INTERCHANGE, Roberts, SD
Built 1980 ADT: 258
IRR 104 ST
UnknownOver: I029
2.0 N SD 127 INTERCH, Roberts, SD
Built 1976 ADT: 4,760
IRR I029 S
UnknownOver: SD127
SD 127 & I29 INTERCHANGE, Roberts, SD
Built 1976 ADT: 669
IRR I029 N
UnknownOver: SD127
SD 127 & I29 INTERCHANGE, Roberts, SD
Built 1976 ADT: 715
IRR I029 S
UnknownOver: 101 ST (FAS)
1.0 S NORTH DAKOTA LINE, Roberts, SD
Built 1976 ADT: 175
IRR I029 N
UnknownOver: 101 ST (FAS)
1.0 S NORTH DAKATO LINE, Roberts, SD
Built 1976 ADT: 175
I029 S
UnknownOver: 302 ST (FAS 6372)
5 S SD 46 INTERCHANGE, Union, SD
Built 1960 ADT: 369
SD046
UnknownOver: I029
SD 46 INTERCHANGE, Union, SD
Built 2000 ADT: 13,790
298 ST
UnknownOver: I029
1 S SD 46 INTERCH, Union, SD
Built 1960 ADT: 11,460
300 ST
UnknownOver: I029
3 S SD 46 INTERCH, Union, SD
Built 1960 ADT: 11,460
I029 N
UnknownOver: 302 ST (FAS 6372)
5 S SD 46 INTERCHANGE, Union, SD
Built 1960 ADT: 369
306 ST (FAS 6370)
UnknownOver: I029
9.0 S SD 46 INTERCHANGE, Union, SD
Built 1960 ADT: 11,970
307 ST
UnknownOver: I029
10 S SD 46 INTERCH, Union, SD
Built 1961 ADT: 11,970
309 ST
UnknownOver: I029
4 N SD 48 INTERCH, Union, SD
Built 1961 ADT: 11,970
SD048
UnknownOver: I029
SD 48 INTERCHANGE, Union, SD
Built 1961 ADT: 11,970
SD050
UnknownOver: I029
SD 50 INTERCHANGE, Union, SD
Built 1960 ADT: 12,480
472 AVE
UnknownOver: I029
2.2 SE SD 50 INTERCH, Union, SD
Built 1960 ADT: 11,930
475 AVE
UnknownOver: I029
6.2 SE SD 50 INTERCH, Union, SD
Built 1960 ADT: 11,930
I029 S
UnknownOver: I029 L
W ELK POINT INTERCHANGE, Union, SD
Built 1993 ADT: 2,264
I029 N
UnknownOver: I029 L
W ELK POINT INTERCHANGE, Union, SD
Built 1994 ADT: 2,264
I029 L
UnknownOver: I029
E ELK POINT INTERCHANGE, Union, SD
Built 1960 ADT: 12,610
478 AVE
UnknownOver: I029
1.3 SE OF ELK POINT, Union, SD
Built 1961 ADT: 13,630
480 AVE (FAS 6285)
UnknownOver: I029
2.2 NW JEFFERSON INTERCH, Union, SD
Built 1961 ADT: 13,630
330TH STREET
UnknownOver: I029
JEFFERSON INTERCHANGE, Union, SD
Built 1961 ADT: 13,630
Showing 401-450 of 5,905 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
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.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.