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
SD050
FairOver: WEST BR EMANUEL CK
0.3 E JCT SD 37 NORTH, Bon Homme, SD
Built 1960 Load: 36.6 t ADT: 2,189
41970 301st Street
FairOver: Snatch Creek
3N & 3.2E of Tyndall, Bon Homme, SD
Built 1959 Load: 36.6 t ADT: 345
US085
FairOver: HAY CK
0.8 N JCT SD 34, Butte, SD
Built 1963 Load: 36.6 t ADT: 14,896
SD079
FairOver: DEADMAN CK
0.6 N NEWELL & JCT 212 E, Butte, SD
Built 1962 Load: 36.6 t ADT: 786
SD040
FairOver: BATTLE CK
2.6 W OF HERMOSA, Custer, SD
Built 1986 Load: 36.6 t ADT: 980
273 ST
FairOver: PLUM CK
1.6E & 2N of Milltown, Hutchinson, SD
Built 1982 Load: 36.6 t ADT: 35
PARK DRIVE
FairOver: RAPID CK
0.2S PARK DR & SD44 - RC, Pennington, SD
Built 1974 Load: 36.6 t ADT: 5,400
US281
FairOver: TURTLE CK
0.5 N JCT US 212, Spink, SD
Built 1963 Load: 36.6 t ADT: 2,226
46240 287TH ST.
FairOver: VERMILLION RV
2S & 1.4E DAVIS, Turner, SD
Built 1991 Load: 36.6 t ADT: 65
US014 B
FairOver: EAST BR SIX MILE CK
1.6 W I 29 INTERCH, Brookings, SD
Built 1968 Load: 36.7 t ADT: 8,734
SD045
FairOver: CROW CK
3.9 N BUFFALO CO LINE, Hand, SD
Built 1955 Load: 36.7 t ADT: 503
176 ST
FairOver: BRYANT CK
1E & 3.7S ROCKHAM, Hand, SD
Built 1983 Load: 36.7 t ADT: 15
FAIRPOINT RD.
FairOver: SULPHUR CK
8.2 N 1.0 E FAIRPOIN, Meade, SD
Built 1977 Load: 36.7 t ADT: 33
IRR SD127
FairOver: LITTLE MINNESOTA RV
2.7 N JCT SD 10, Roberts, SD
Built 1953 Load: 36.7 t ADT: 838
FAS 3214
FairOver: BAD RV
0.6W & 1.8S OF FT. PIERRE, Stanley, SD
Built 1990 Load: 36.7 t ADT: 210
US018
FairOver: COTTONWOOD CK
0.5 E JCT US 183N, Tripp, SD
Built 1965 Load: 36.7 t ADT: 1,613
SD046
FairOver: CK
0.2 W JCT SD 37, Bon Homme, SD
Built 1935 Load: 36.8 t ADT: 758
US014A
FairOver: HOMESTAKE FLUME
7.2 S OF SPEARFISH, Lawrence, SD
Built 1967 Load: 36.8 t ADT: 1,854
S. Marion Road
FairOver: Skunk Creek
north of Silver Valley Dr, Minnehaha, SD
Built 2003 Load: 36.8 t ADT: 15,400
US212
FairOver: TURTLE CK
0.3 NW JCT US 281 S, Spink, SD
Built 2017 Load: 36.8 t ADT: 1,606
IRR SD046
FairOver: DRY CHOTEAU CK
WEST CO LINE, Bon Homme, SD
Built 1964 Load: 36.9 t ADT: 758
US014
FairOver: CK
1.6 E I 29 INTERCH, Brookings, SD
Built 1973 Load: 36.9 t ADT: 4,885
SD040
FairOver: BILLOVER CK
1.1 E JCT SD 79, Custer, SD
Built 1968 Load: 36.9 t ADT: 665
I229 N
FairOver: BIG SIOUX RV
0.4 N RICE ST INTERCH, Minnehaha, SD
Built 2001 Load: 36.9 t ADT: 14,390
US012
FairOver: SNAKE CK
0.1 E EDMUNDS CO LINE, Brown, SD
Built 1970 Load: 37.0 t ADT: 2,958
US281 S
FairOver: MOCCASIN CK
6.7 S JCT US 12, Brown, SD
Built 1972 Load: 37.0 t ADT: 1,836
US281 N
FairOver: MOCCASIN CK
6.7 S JCT US 12, Brown, SD
Built 1972 Load: 37.0 t ADT: 1,836
SD044
FairOver: LONE TREE CK
2.1 W JCT SD 47, Gregory, SD
Built 1971 Load: 37.0 t ADT: 568
IRR SD063
FairOver: CHEYENNE RV
ZIEBACH-HAAKON CO LINE, Ziebach, SD
Built 1981 Load: 37.0 t ADT: 396
469TH AVENUE
FairOver: BIG SIOUX RV
4.3S & 2W BROOKINGS, Brookings, SD
Built 1968 Load: 37.1 t ADT: 684
SD034
FairOver: REDWATER RV
2.0 NW LAWRENCE CO LINE, Butte, SD
Built 1992 Load: 37.1 t ADT: 3,278
US212
FairOver: CROW TIMBER CK
1.6 W MINNESOTA LINE, Deuel, SD
Built 1971 Load: 37.1 t ADT: 1,399
294th Street
FairOver: Big Sioux River
State Line east of Hudson, Lincoln, SD
Built 2009 Load: 37.1 t ADT: 705
US183
FairOver: KEYA PAHA RV
2.2 N NEBRASKA LINE, Tripp, SD
Built 1983 Load: 37.1 t ADT: 344
165 STREET
FairOver: BIG SIOUX RV
7.0N & 2.5W WATERTOWN, Codington, SD
Built 1987 Load: 37.2 t ADT: 73
419th Avenue
FairOver: Crow Creek
4W & 2.6S of Britton, Marshall, SD
Built 1928 Load: 37.2 t ADT: 35
I190
FairOver: RAPID CK
0.1 N JCT SD 44, Pennington, SD
Built 1973 Load: 37.2 t ADT: 17,340
SD048
FairOver: CK
3.8 E I 29 INTERCH, Union, SD
Built 1957 Load: 37.2 t ADT: 742
CAPITAL STREET
FairOver: MARNE CREEK
CAPITAL STREET - YANKTON, Yankton, SD
Built 1989 Load: 37.2 t ADT: 89
US014 B
FairOver: DEER CK
1.4 E I 29 INTERCH, Brookings, SD
Built 1967 Load: 37.3 t ADT: 2,684
SD026
FairOver: NORTH WOLF CK
5.9 E JCT SD 45, Hand, SD
Built 1966 Load: 37.3 t ADT: 244
COUNTY RD
FairOver: VERMILLION RV
0.7N & 0.2W CENTERVILLE, Turner, SD
Built 1988 Load: 37.3 t ADT: 484
W. Madison Street
FairOver: Big Sioux River
east of Louise Avenue, Minnehaha, SD
Built 1988 Load: 37.4 t ADT: 2,783
SD040
FairOver: BATTLE CK
1.6 E JCT US 16A, Pennington, SD
Built 1974 Load: 37.4 t ADT: 995
US016 E
FairOver: SPRING CK
2.3 S JCT US 16B, Pennington, SD
Built 1963 Load: 37.4 t ADT: 4,626
IRR AR SD020
FairOver: LYON CK
0.9 W ZIEBACH CO LINE, Perkins, SD
Built 1962 Load: 37.4 t ADT: 121
1ST ST PLANKINTON
FairOver: CK
EAST EDGE OF PLANKINTON, Aurora, SD
Built 2008 Load: 37.5 t ADT: 50
SD089
FairOver: CK, ABANDON LINE RR
6.8 N FALL RIVER CO LINE, Custer, SD
Built 1970 Load: 37.5 t ADT: 990
25250 OLD MILL RD
FairOver: JAMES RV
0.5S & 6.9W OF FULTON, Hanson, SD
Built 1975 Load: 37.5 t ADT: 175
US085
FairOver: BULL CK
13.6 NE OF BUFFALO, Harding, SD
Built 1960 Load: 37.5 t ADT: 1,312
Showing 2,451-2,500 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 |