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
SD020
FairOver: CK
0.2 W JCT SD 37, Spink, SD
Built 1958 Load: 72.3 t ADT: 592
183 AVENUE
FairOver: NORTH FORK GRAND RV
9.5 S WHITE BUTTE, Perkins, SD
Built 1975 Load: 72.8 t ADT: 155
SD123
FairOver: CK
2.5 S JCT SD 15, Roberts, SD
Built 1988 Load: 73.0 t ADT: 276
404th Avenue
FairOver: Creek
2.5N & 2.0W of Verdon, Brown, SD
Built 2003 Load: 73.8 t ADT: 98
144th Street
FairOver: Snake Creek
4N & 7.7W Mansfield, Brown, SD
Built 2007 Load: 74.5 t ADT: 98
479th Avenue
FairOver: Spring Creek
2.3N & 3E of Harrisburg, Lincoln, SD
Built 1999 Load: 74.6 t ADT: 45
US014
FairOver: NOWLIN CK
5.9 W OF MIDLAND, Haakon, SD
Built 1994 Load: 75.0 t ADT: 678
US014
FairOver: SOUTH FORK PEARL CK
0.3 E BEADLE CO LINE, Kingsbury, SD
Built 1965 Load: 75.2 t ADT: 1,679
US014
FairOver: CK
4.4 W OF ARLINGTON, Kingsbury, SD
Built 1975 Load: 75.4 t ADT: 2,271
US018
FairOver: CK
0.7 W JCT US 385, Fall River, SD
Built 1968 Load: 76.1 t ADT: 4,622
SD015
FairOver: CK
1 N JCT SD 22, Deuel, SD
Built 1991 Load: 76.5 t ADT: 2,219
SD045
FairOver: CK
3.9 S MCPHERSON CO LINE, Edmunds, SD
Built 1992 Load: 76.6 t ADT: 352
SD1806
FairOver: CK
3.4 N JCT 14, Stanley, SD
Built 1963 Load: 78.0 t ADT: 1,804
IRR AR SD063
FairOver: CORN CK
0.7 N JCT SD 44 E, Mellette, SD
Built 1991 Load: 79.1 t ADT: 159
SD034
FairOver: CK
2.2 E OF UNION CENTER, Meade, SD
Built 1973 Load: 79.7 t ADT: 945
US016
FairOver: SPRING CK
1.2 W JCT US 385, Pennington, SD
Built 1986 Load: 79.8 t ADT: 6,231
IRR AR SD047
FairOver: BR WEST FORK ELM CK
4 N JCT SD 34, Hyde, SD
Built 1959 Load: 79.9 t ADT: 444
US012
FairOver: BLUE BLANKET CK
1.3 W OF GLENHAM, Walworth, SD
Built 1964 Load: 80.2 t ADT: 1,901
SD019
FairOver: DRAINAGE DITCH
1.8 S JCT US 18 WEST, Turner, SD
Built 1963 Load: 80.6 t ADT: 1,358
I029
FairOver: CK
4.1 N I 90 INTERCH, Minnehaha, SD
Built 1963 Load: 81.0 t ADT: 19,910
SD071
FairOver: PLAINS CK
0.5 N JCT SD 471, Fall River, SD
Built 1991 Load: 81.1 t ADT: 239
SD045
FairOver: LOST CK
6.1 S JCT SD 26 E, Hand, SD
Built 2002 Load: 81.1 t ADT: 954
248 ST
FairOver: CK
3.7N 2.1W WHITE LAKE, Aurora, SD
Built 2008 Load: 81.2 t ADT: 33
I029 N
FairOver: CK
1.2 N I 90 INTERCH, Minnehaha, SD
Built 1999 Load: 81.2 t ADT: 11,285
IRR SD034
FairOver: EAST FORK SOLDIER CK
7.3 S HYDE CO LINE, Buffalo, SD
Built 1962 Load: 82.1 t ADT: 874
SD045
FairOver: CK
2.2 N FAULK CO LINE, Edmunds, SD
Built 1986 Load: 82.8 t ADT: 725
SD073
FairOver: WEST BR TURTLE CK
13.2 S OF FAITH, Meade, SD
Built 1987 Load: 83.0 t ADT: 882
US016
FairOver: SPRING CK
2.5 N OF CUSTER CO LINE, Pennington, SD
Built 1998 Load: 83.1 t ADT: 7,034
US014
FairOver: TURTLE CK
2.6 E JCT SD 45, Hand, SD
Built 1996 Load: 83.2 t ADT: 2,047
I090
FairOver: CK
1.4 SE PIEDMONT INTERCH, Meade, SD
Built 1957 Load: 83.4 t ADT: 20,060
4TH STREET
FairOver: HILGERS GULCH
4TH ST - PIERRE, Hughes, SD
Built 1994 Load: 83.9 t ADT: 100
US012
FairOver: CK
1.1 W JCT SD 123, Grant, SD
Built 1994 Load: 84.7 t ADT: 1,590
SD025
FairOver: WEST FORK VERMILLION RV
3.9 S KINGSBURY CO LINE, Miner, SD
Built 1953 Load: 85.3 t ADT: 797
SD045
FairOver: REE CK
1 N JCT US 14, Hand, SD
Built 2002 Load: 86.0 t ADT: 954
US018
FairOver: EAST COTTONWOOD CK
1.9 W JCT SD 53, Tripp, SD
Built 1988 Load: 86.0 t ADT: 1,053
DAKOTA AVENUE
FairOver: HILGERS GULCH
DAKOTA AVE - PIERRE, Hughes, SD
Built 1995 Load: 86.6 t ADT: 2,315
I029 S
FairOver: DRAINAGE DITCH
0.1 S I 90 INTERCH, Minnehaha, SD
Built 2000 Load: 87.2 t ADT: 21,205
IRR AR SD050
FairOver: BAD HAND CK
5.4 N JCT I 90 LOOP, Brule, SD
Built 1995 Load: 87.7 t ADT: 949
US014 B
FairOver: WEST BR SIX MILE CK
2.5 W I 29 INTERCH, Brookings, SD
Built 1967 Load: 88.9 t ADT: 9,525
SD123
FairOver: CK
0.2 N GRANT CO LINE, Roberts, SD
Built 1988 Load: 89.0 t ADT: 276
SD027
FairOver: TRIB SPAIN DITCH
3.8 N & 3.6 E of Langford, Marshall, SD
Built 1959 Load: 89.7 t ADT: 613
SD1806
FairOver: CK
1.4 N JCT US 14, Stanley, SD
Built 1963 Load: 89.7 t ADT: 1,804
244 ST FAS 6506
FairOver: BR SMITH CK
7N & 0.6W KIMBALL, Brule, SD
Built 2005 Load: 89.8 t ADT: 35
SD045
FairOver: CK
8.7 S JCT US 14 E, Hand, SD
Built 1928 Load: 89.8 t ADT: 551
SD045
FairOver: SPRING CK
3.6 S NORTH DAKOTA LINE, McPherson, SD
Built 1933 Load: 89.8 t ADT: 178
154 STREET
FairOver: CK
6S & 0.2W HOVEN, Potter, SD
Built 2007 Load: 89.8 t ADT: 10
Corson County 35
FairOver: Grand River
2.4E & 16S THUNDER HAWK, Corson, SD
Built 1990 Load: 90.4 t ADT: 20
SD032
FairOver: SQUAW CK
2.0 E I 29 INTERCH, Moody, SD
Built 1977 Load: 90.8 t ADT: 2,043
SD079
FairOver: DRY CK
6.4 N FALL RIVER CO LINE, Custer, SD
Built 2004 Load: 91.1 t ADT: 3,672
US016
FairOver: SPRING CK
1.6 N OF CUSTER CO LINE, Pennington, SD
Built 1998 Load: 91.3 t ADT: 7,034
Showing 2,951-3,000 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 |