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
IRR BIA RTE 3202
FairOver: WHITE RIVER
10 KM EAST OF SLIM BUTTE, Oglala Lakota, SD
Built 1959 Load: 32.7 t ADT: 154
SD231 S
FairOver: RCP&E RR, DRAINAG
0.3 W JCT SD 445, Pennington, SD
Built 1971 Load: 32.7 t ADT: 7,200
I090 W
FairOver: CHEYENNE RV
0.3 E WASTA INTERCH, Pennington, SD
Built 1964 Load: 32.7 t ADT: 4,330
I090 E
FairOver: CHEYENNE RV
0.3 E WASTA INTERCH, Pennington, SD
Built 1964 Load: 32.7 t ADT: 4,330
409TH AVE
FairOver: CREEK
3E & 0.2N CONDE, Spink, SD
Built 1940 Load: 32.7 t ADT: 12
331 AVENUE
FairOver: BUFFALO CK
11.5E 0.5N WEWELA, Tripp, SD
Built 2020 Load: 32.7 t ADT: 31
31080 473 AVE.
FairOver: CK
1E & 12.6S BERESFORD, Union, SD
Built 1950 Load: 32.7 t ADT: 40
IRR BIA RTE 12
FairOver: BIG COTTONWOOD CREEK
14 KM NE OF CHERRY CREEK, Ziebach, SD
Built 1969 Load: 32.7 t ADT: 217
IRR BIA RTE 12
FairOver: LITTLE COTTONWOOD CREEK
10 KM NE OF CHERRY CREEK, Ziebach, SD
Built 1969 Load: 32.7 t ADT: 205
IRR BIA RTE 6
FairOver: RED COAT CREEK
1.9 KM SE OF RED SCAFFOLD, Ziebach, SD
Built 1976 Load: 32.7 t ADT: 275
MEDARY AVENUE
FairOver: EAST BR SIX MILE CK
MEDARY AVE N BYPASS BRKGS, Brookings, SD
Built 1968 Load: 32.8 t ADT: 3,213
SD044
FairOver: RAPID CK
5.5 SE JCT US 385, Pennington, SD
Built 1958 Load: 32.8 t ADT: 3,104
46350 291 ST.
FairOver: VERMILLION RV
4N & 1.5E CENTERVILLE, Turner, SD
Built 1966 Load: 32.8 t ADT: 283
SD011
FairOver: EAST BRULE CK
0.5 S JCT SD 46, Union, SD
Built 1965 Load: 32.8 t ADT: 1,169
SD030
FairOver: DEER CK
6.9 E OF WHITE, Brookings, SD
Built 1959 Load: 32.9 t ADT: 1,187
382nd Avenue
FairOver: Elm River
4W & 4S of Fredrick, Brown, SD
Built 1991 Load: 32.9 t ADT: 77
SD044
FairOver: ANDES CK
0.5 W JCT US 281 N, Douglas, SD
Built 1957 Load: 32.9 t ADT: 1,417
158TH ST
FairOver: SOUTH FORK SNAKE CK
5S & 1.7E CRESBARD, Faulk, SD
Built 1973 Load: 32.9 t ADT: 5
US081
FairOver: LAKE ALBERT OUTLET
1.6 S JCT SD 28 W, Hamlin, SD
Built 1991 Load: 32.9 t ADT: 2,499
I090 E
FairOver: CK
0.4 W SD 38 INTERCH, Minnehaha, SD
Built 1962 Load: 32.9 t ADT: 7,615
210th Street
FairOver: James River
2S & 1.1E of Huron, Beadle, SD
Built 1977 Load: 33.0 t ADT: 56
SD045
FairOver: BR SMITH CK
7 S BUFFALO CO LINE, Brule, SD
Built 1957 Load: 33.0 t ADT: 971
IRR US018
FairOver: CK
0.5 E OF US 281 JUNCTION, Charles Mix, SD
Built 1961 Load: 33.0 t ADT: 409
SD028
FairOver: LAKE NORDEN OUTLET
1.5 E JCT SD 21 N, Hamlin, SD
Built 1949 Load: 33.0 t ADT: 2,060
SD011
FairOver: WEST PIPESTONE CK
5.2 N I 90 INTERCH, Minnehaha, SD
Built 1953 Load: 33.0 t ADT: 3,797
IRR I029
FairOver: TWIN CITY RR
4.5 S SD 10 INTERCH, Roberts, SD
Built 1982 Load: 33.0 t ADT: 4,890
44390 269 ST
FairOver: WEST FORK VERMILLION RV
2.8E DOLTON, Turner, SD
Built 1970 Load: 33.0 t ADT: 286
US018
FairOver: OAK HOLLOW CK
0.8 W HUTCHINSON CO LINE, Douglas, SD
Built 1961 Load: 33.1 t ADT: 588
US018
FairOver: CREEK
3.0 W OF SD37 JUNCTION, Hutchinson, SD
Built 1961 Load: 33.1 t ADT: 738
SD034
FairOver: BR CROW CK
3.8 E BUFFALO CO LINE, Jerauld, SD
Built 1952 Load: 33.1 t ADT: 513
SD027
FairOver: WILD RICE CK
4.5 N JCT SD 10, Marshall, SD
Built 1960 Load: 33.1 t ADT: 667
IRR US212
FairOver: BEAR CK
1 W OF RED ELM, Ziebach, SD
Built 1955 Load: 33.1 t ADT: 1,067
IRR US212
FairOver: BEAR CK
0.5 W OF DUPREE, Ziebach, SD
Built 1954 Load: 33.1 t ADT: 1,113
IRR SD1806
FairOver: BURLINGTON NORTHERN RR
3.0 N JCT US 12, Corson, SD
Built 1973 Load: 33.2 t ADT: 915
194TH ST.
FairOver: SOUTH CANAL
12N & 2.7E STURGIS, Meade, SD
Built 1968 Load: 33.2 t ADT: 26
FOX RIDGE RD.
FairOver: CK
1.8E 1.7S OPAL, Meade, SD
Built 1965 Load: 33.2 t ADT: 33
I090 W
FairOver: BURLINGTON NORTHERN RR
0.5 W SD 11 INTERCH, Minnehaha, SD
Built 1960 Load: 33.2 t ADT: 15,085
207TH STREET
FairOver: NORTH DEER CK
5N & 3.9W BROOKINGS, Brookings, SD
Built 1977 Load: 33.3 t ADT: 25
IRR US018
FairOver: BRANCH OF CHOTEAU CK
0.1 E CHARLES MIX CO LINE, Douglas, SD
Built 1961 Load: 33.3 t ADT: 588
SD46
FairOver: BIG SIOUX RIVER
At South Dakota Border, Union, SD
Built 1991 Load: 33.3 t ADT: 1,610
US018
FairOver: LONG CK
0.5 W JCT SD 17, Lincoln, SD
Built 1952 Load: 33.4 t ADT: 2,058
CREIGHTON RD
FairOver: DEEP CK
4.3E 9.9N CREIGHTON, Pennington, SD
Built 1976 Load: 33.4 t ADT: 24
257 ST
FairOver: COTTONWOOD CK
0.6W & 15.9N WITTEN, Tripp, SD
Built 2006 Load: 33.4 t ADT: 55
27080 445 AVE
FairOver: WEST FORK VERMILLION RV
2.2N & 2W MARION, Turner, SD
Built 1991 Load: 33.4 t ADT: 100
US014 W
FairOver: RAVINE LK
0.5 E JCT SD 37, Beadle, SD
Built 1960 Load: 33.5 t ADT: 2,520
SD045
FairOver: CROW CK
0.6 S JCT SD 34, Buffalo, SD
Built 1958 Load: 33.5 t ADT: 773
US085
FairOver: MOREAU RV
5.8 S HARDING CO LINE, Butte, SD
Built 1965 Load: 33.5 t ADT: 1,223
US085
FairOver: FOUR MILE CK
8.4 S HARDING CO LINE, Butte, SD
Built 1965 Load: 33.5 t ADT: 1,223
SD073
FairOver: GRINDSTONE CK
2.5 N JCT US 14, Haakon, SD
Built 1954 Load: 33.5 t ADT: 422
158 STREET
FairOver: LITTLE CHEYENNE CK
8.6W & 6N GETTYSBURG, Potter, SD
Built 1978 Load: 33.5 t ADT: 47
Showing 2,251-2,300 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 |