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
SAGE CREEK ROAD
FairOver: SAGE CK
8.7W 5.8S WALL, Pennington, SD
Built 1977 Load: 26.9 t ADT: 352
387TH AVE
FairOver: SNAKE CREEK
2.3S ASHTON, Spink, SD
Built 1997 Load: 26.9 t ADT: 55
231 AVENUE
FairOver: LITTLE WHITE RV
1.3 N TUTHILL, Bennett, SD
Built 1976 Load: 27.1 t ADT: 119
464 AVENUE
FairOver: STRAY HORSE CK
.4W 5.2S KRANZBURG, Codington, SD
Built 1961 Load: 27.2 t ADT: 218
464 AVENUE
FairOver: STRAY HORSE CK
.4W 5.9S KRANZBURG, Codington, SD
Built 1961 Load: 27.2 t ADT: 218
IRR US012
FairOver: DEEP BANK CK
6.6 NW JCT SD 20, Corson, SD
Built 1965 Load: 27.2 t ADT: 1,102
SD ROUTE 87
FairOver: SD ROUTE 87
ON SD ROUTE 87, MP 43.1;, Custer, SD
Built 1940 Load: 27.2 t ADT: 326
SD020
FairOver: CK
3.7 E JCT SD 15, Grant, SD
Built 1956 Load: 27.2 t ADT: 249
151ST AVENUE
FairOver: CK
1.8E,0.4N,BOX ELDER, Pennington, SD
Built 1940 Load: 27.2 t ADT: 644
IRR BIA RTE 9
FairOver: LITTLE WHITE RIVER
4.0 KM N JCT US 18 & RT 9, Todd, SD
Built 1970 Load: 27.2 t ADT: 531
31128 472ND AVE.RD
FairOver: BRULE CK
13.1S BERESFORD, Union, SD
Built 1985 Load: 27.2 t ADT: 35
IRR US012
FairOver: BURLINGTON NORTHERN RR
0.2 W JCT SD 65 S, Corson, SD
Built 1936 Load: 27.3 t ADT: 483
SD079
FairOver: NORTH FORK GRAND RV
0.1 S NORTH DAKOTA LINE, Harding, SD
Built 1966 Load: 27.3 t ADT: 357
299th Street
FairOver: Medicine Creek
6W & 1.3N of Presho, Lyman, SD
Built 1968 Load: 27.3 t ADT: 25
425 AVE
FairOver: REDSTONE CK
N EDGE OF CARTHAGE, Miner, SD
Built 1965 Load: 27.3 t ADT: 125
US014
FairOver: COTTONWOOD CK
4.2 S JCT SD 34, Stanley, SD
Built 1960 Load: 27.3 t ADT: 749
THIRD STREET
FairOver: JAMES RV
3RD ST SE IN HURON, Beadle, SD
Built 1982 Load: 27.4 t ADT: 4,828
SD045
FairOver: CK
2.8 S JCT SD 34, Buffalo, SD
Built 1960 Load: 27.4 t ADT: 773
198TH ST
FairOver: TURTLE CK
0.1E ST LAWRENCE, Hand, SD
Built 1950 Load: 27.4 t ADT: 30
28170 433 AVE.
FairOver: CK
4.3N,2.0E OF MENNO, Hutchinson, SD
Built 1984 Load: 27.4 t ADT: 45
IRR AR US012
FairOver: BURLINGTON NORTHERN RR
0.3 E CORSON CO LINE, Walworth, SD
Built 1957 Load: 27.4 t ADT: 2,092
FOSTER STREET
FairOver: DRY RUN CK/RR
FOSTER ST - MITCHELL, Davison, SD
Built 1999 Load: 27.5 t ADT: 384
HISEGA DRIVE
FairOver: RAPID CK
HISEGA LODGE, Pennington, SD
Built 1973 Load: 27.5 t ADT: 207
SD073
FairOver: GRAND RV
0.3 S OF SHADEHILL, Perkins, SD
Built 1995 Load: 27.5 t ADT: 705
155TH ST
FairOver: CREEK
1.0S,0.8E NORTHVILLE, Spink, SD
Built 1940 Load: 27.5 t ADT: 31
SD020
FairOver: DRY RUN CK
1.6 W CLARK CO LINE, Spink, SD
Built 1959 Load: 27.5 t ADT: 558
SD044
FairOver: DRAW
0.7 SE OF FARMINGDALE, Pennington, SD
Built 1964 Load: 27.6 t ADT: 2,234
SD044
FairOver: CK
6.3 SE OF FARMINGDALE, Pennington, SD
Built 1964 Load: 27.6 t ADT: 1,463
I029
FairOver: CK
1.5 S SD 30 INTERCH, Brookings, SD
Built 1970 Load: 27.7 t ADT: 9,960
147th Street
FairOver: Snake Creek
1N & 7.3W of Mansfield, Brown, SD
Built 1990 Load: 27.7 t ADT: 98
US212
FairOver: SULPHUR CK
5.2 SW MEADE CO LINE, Butte, SD
Built 1956 Load: 27.8 t ADT: 494
SD034
FairOver: BEAR BUTTE CK
6.0 NE JCT SD 79N, Meade, SD
Built 2014 Load: 27.8 t ADT: 818
CAMBELL ST
FairOver: CK
0.5 N US 16B, Pennington, SD
Built 1964 Load: 27.8 t ADT: 18,870
SD034
FairOver: HAY CK
3.7 W JCT US 85, Butte, SD
Built 1956 Load: 27.9 t ADT: 1,042
MAIN ST-MARVIN
FairOver: BURLINGTON NORTHERN RR
MAIN STREET MARVIN, Grant, SD
Built 1940 Load: 27.9 t ADT: 125
SD028
FairOver: BIG SIOUX RV
2.3 W DEUEL CO LINE, Hamlin, SD
Built 1951 Load: 27.9 t ADT: 1,323
SD034
FairOver: DRY RUN CK
5.1 E JCT US 14 & 83, Hughes, SD
Built 1955 Load: 27.9 t ADT: 1,566
206 STREET
FairOver: MEDICINE KNOLL CK
0.4 E CANNING, Hughes, SD
Built 1965 Load: 27.9 t ADT: 59
164TH ST
FairOver: SOUTH FORK SNAKE CK
N LIMITS OF ATHOL, Spink, SD
Built 1968 Load: 27.9 t ADT: 85
US012 W
FairOver: BURLINGTON NORTHERN RR
3.2 W JCT SD 37, Brown, SD
Built 1975 Load: 28.0 t ADT: 2,783
SD050
FairOver: PEASE CK
5.3 S JCT SD 44 E, Charles Mix, SD
Built 1955 Load: 28.0 t ADT: 550
27357 414 AVE.
FairOver: PONY CK
1.3N,3E NE COR. PARKSTON, Hutchinson, SD
Built 1955 Load: 28.0 t ADT: 23
WHITEWOOD VALLEY
FairOver: WHITEWOOD CK
4.0N 1.8E WHITWOOD, Lawrence, SD
Built 1966 Load: 28.0 t ADT: 49
US018
FairOver: Big Sioux River
at Iowa Border, Lincoln, SD
Built 1978 Load: 28.0 t ADT: 2,210
SD047
FairOver: WHITE RV
7.3 S I 90 INTERCH, Lyman, SD
Built 1954 Load: 28.0 t ADT: 642
HISEGA DRIVE
FairOver: RAPID CK
0.1E 0.1S HISEGA LDG, Pennington, SD
Built 1973 Load: 28.0 t ADT: 106
45590 271 ST
FairOver: ELCE CK
4N & 2.9E PARKER, Turner, SD
Built 2013 Load: 28.0 t ADT: 40
SD037
FairOver: ANTELOPE CK
2.3 S JCT US 12, Brown, SD
Built 1953 Load: 28.1 t ADT: 1,140
SD045
FairOver: BR CROW CK
1.8 N JCT SD 34, Buffalo, SD
Built 1958 Load: 28.1 t ADT: 503
SD022
FairOver: COBB CK
9.3 E JCT SD 15, Deuel, SD
Built 1955 Load: 28.1 t ADT: 1,030
Showing 1,901-1,950 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.