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
205TH STREET
FairOver: CK
1.5S & 0.2E WHITE, Brookings, SD
Built 1977 Load: 19.6 t ADT: 92
479TH AVENUE
FairOver: MEDARY CK
2.6S & 1E BUSHNELL, Brookings, SD
Built 1984 Load: 19.6 t ADT: 92
211TH STREET
FairOver: CK
1.4E BUSHNELL, Brookings, SD
Built 1940 Load: 19.6 t ADT: 92
480TH AVENUE
FairOver: CK
1.1N & 2E BUSHNELL, Brookings, SD
Built 1930 Load: 19.6 t ADT: 92
215TH STREET
FairOver: CK
2N & 1.1W ELKTON, Brookings, SD
Built 1985 Load: 19.6 t ADT: 92
485TH AVENUE
FairOver: EAST BR DEER CK
5.2N & 7.8E BUSHNELL, Brookings, SD
Built 2007 Load: 19.6 t ADT: 63
394TH AVENUE
FairOver: Firesteel Creek
3W 6.9N MT VERNON, Davison, SD
Built 1993 Load: 19.6 t ADT: 64
396TH AVENUE
FairOver: FIRESTEEL CK
3.4N & 1W MT VERNON, Davison, SD
Built 1975 Load: 19.6 t ADT: 64
396TH AVENUE
FairOver: ENEMY CK
2.4S & 1W MT VERNON, Davison, SD
Built 1970 Load: 19.6 t ADT: 64
397TH AVENUE
FairOver: FIRESTEEL CK
3.8N MT. VERNON, Davison, SD
Built 1966 Load: 19.6 t ADT: 495
398TH AVENUE
FairOver: FIRESTEEL CK
4.1N & 1E MT VERNON, Davison, SD
Built 1970 Load: 19.6 t ADT: 64
248TH STREET
FairOver: CK
5.8 N & 0.5 S OF LOOMIS, Davison, SD
Built 1988 Load: 19.6 t ADT: 164
264TH SREET
FairOver: NORTH BR TWELVE MILE CK
10 S & 7.6W MITCHELL, Davison, SD
Built 1945 Load: 19.6 t ADT: 15
402ND AVENUE
FairOver: ENEMY CK
9 W & 2.4 N ETHAN, Davison, SD
Built 1964 Load: 19.6 t ADT: 64
402ND AVENUE
FairOver: NORTH BR TWELVE MILE CK
9 W & 0.6 N ETHAN, Davison, SD
Built 1970 Load: 19.6 t ADT: 64
245TH STREET
FairOver: DRY RUN CK
2.5 N & 2.7 E LOOMIS, Davison, SD
Built 1960 Load: 19.6 t ADT: 80
403RD AVENUE
FairOver: CK
8 W 0.3 S ETHAN, Davison, SD
Built 1964 Load: 19.6 t ADT: 261
261ST STREET
FairOver: ENEMY CK
4 N & 7.9 W ETHAN, Davison, SD
Built 1970 Load: 19.6 t ADT: 64
265TH STREET
FairOver: NORTH BR TWELVE MILE CK
6.8 W JCT SD 37, Davison, SD
Built 1977 Load: 19.6 t ADT: 248
404TH AVENUE
FairOver: MORRIS CK (DRY RUN CK?)
1W 2.IN LOOMIS, Davison, SD
Built 1964 Load: 19.6 t ADT: 163
404TH AVENUE
FairOver: TRIB TWELVE MILE CK
7W & 0.3N Ethan, Davison, SD
Built 1950 Load: 19.6 t ADT: 35
404TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
5W & 11.3 S MITCHELL, Davison, SD
Built 1962 Load: 19.6 t ADT: 35
405TH AVENUE
FairOver: FIRESTEEL CK
2 S LOOMIS, Davison, SD
Built 1967 Load: 19.6 t ADT: 218
405TH AVENUE
FairOver: ENEMY CK
7.3 N & 6 W ETHAN, Davison, SD
Built 1970 Load: 19.6 t ADT: 45
405TH AVENUE
FairOver: CK
5.8N 6.0W ETHAN, Davison, SD
Built 1987 Load: 19.6 t ADT: 64
405TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
6.0 W & 0.5 S ETHAN, Davison, SD
Built 1923 Load: 19.6 t ADT: 85
258TH STREET
FairOver: ENEMY CK
4 S & 3.5 W MITCHELL, Davison, SD
Built 1963 Load: 19.6 t ADT: 25
265TH STREET
FairOver: NORTH BR TWELVE MILE CK
4.2 W JCT SD 37, Davison, SD
Built 1977 Load: 19.6 t ADT: 356
406TH AVENUE
FairOver: FIRESTEEL CK
1.7 S & 1 E LOOMIS, Davison, SD
Built 1975 Load: 19.6 t ADT: 35
406TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
5 W 0.1 N ETHAN, Davison, SD
Built 1968 Load: 19.6 t ADT: 86
247TH STREET
FairOver: DRY RUN CK
0.7 N 1.5 E LOOMIS, Davison, SD
Built 1954 Load: 19.6 t ADT: 897
407TH AVENUE
FairOver: ENEMY CK
4.9S & 2W MITCHELL, Davison, SD
Built 1979 Load: 19.6 t ADT: 48
262ND STREET
FairOver: NORTH BR TWELVE MILE CK
3 N & 3.5 W ETHAN, Davison, SD
Built 1965 Load: 19.6 t ADT: 34
408TH AVENUE
FairOver: ENEMY CK
4.9S 1.0W MITCHELL, Davison, SD
Built 1960 Load: 19.6 t ADT: 742
408TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
7.9 S & 2.0 W MITCHELL, Davison, SD
Built 1925 Load: 19.6 t ADT: 433
408TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
1 W & 8.8 S MITCHELL, Davison, SD
Built 1920 Load: 19.6 t ADT: 433
259TH STREET
FairOver: ENEMY CK
5 S & 0.6 W MITCHELL, Davison, SD
Built 2000 Load: 19.6 t ADT: 64
409TH AVENUE
FairOver: DRAINAGE DITCH
1.6 S MITCHELL, Davison, SD
Built 1920 Load: 19.6 t ADT: 149
409TH AVENUE
FairOver: ENEMY CK
4.2 S MITCHELL, Davison, SD
Built 1915 Load: 19.6 t ADT: 149
409TH AVENUE
FairOver: NORTH BR TWELVE MILE CK
3.7 N & 2 W ETHAN, Davison, SD
Built 1965 Load: 19.6 t ADT: 64
409TH AVENUE
FairOver: SOUTH FORK TWELVE MILE C
2.7 S & 2 W ETHAN, Davison, SD
Built 1978 Load: 19.6 t ADT: 45
245TH STREET
FairOver: JAMES RV
9.0N,1.2E MITCHELL, Davison, SD
Built 1987 Load: 19.6 t ADT: 64
262ND STREET
FairOver: NORTH BR TWELVE MILE CK
3 N & 0.3 E ETHAN, Davison, SD
Built 1972 Load: 19.6 t ADT: 64
262ND STREET
FairOver: NORTH BR TWELVE MILE CK
3 N & 0.5 E ETHAN, Davison, SD
Built 1964 Load: 19.6 t ADT: 62
39470 274 ST
FairOver: CHOTEAU CK
5.6N,2.7E OF ARMOUR, Douglas, SD
Built 1937 Load: 19.6 t ADT: 25
339TH AVE
FairOver: CK
6E & 4.7S SENECA, Faulk, SD
Built 1940 Load: 19.6 t ADT: 36
355TH AVE
FairOver: CK
6.3N ORIENT, Faulk, SD
Built 1941 Load: 19.6 t ADT: 36
359TH AVE
FairOver: NORTH FORK SNAKE CK
3.7N & 3W CRESBARD, Faulk, SD
Built 1940 Load: 19.6 t ADT: 60
360TH AVE
FairOver: CK
1.5W & 0.2N CRESBARD, Faulk, SD
Built 1938 Load: 19.6 t ADT: 60
153RD ST
FairOver: CK
1.1W CRESBARD, Faulk, SD
Built 1931 Load: 19.6 t ADT: 60
Showing 851-900 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 |