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
148TH ST
FairOver: James River
8.5 E of Mansfield, Spink, SD
Built 1939 Load: 25.9 t ADT: 39
148TH STREEY
FairOver: CREEK
1W RANDOLPH, Spink, SD
Built 1977 Load: 25.9 t ADT: 146
Yellow Dog Hill Rd
FairOver: Crow Creek
3S & 11.4W of Gann Valley, Buffalo, SD
Built 1963 Load: 26.0 t ADT: 40
SD040
FairOver: BATTLE CK
4.4 W JCT SD 79, Custer, SD
Built 1974 Load: 26.0 t ADT: 980
US012
FairOver: BURLINGTON NORTHERN RR
AT MINA, Edmunds, SD
Built 1970 Load: 26.0 t ADT: 3,599
SULFUR CUT OFF RD
FairOver: Frozen Man Creek
7W&9.8S MAURINE, Meade, SD
Built 1967 Load: 26.0 t ADT: 33
160TH AVENUE
FairOver: CK
1.2E 4.8S FARMINGDALE, Pennington, SD
Built 1989 Load: 26.0 t ADT: 74
US014
FairOver: CK
0.6 S JCT SD 34, Stanley, SD
Built 1960 Load: 26.0 t ADT: 749
41920 275 STR.
FairOver: DRY CK
9 E PARKSTON S.D., Hutchinson, SD
Built 1930 Load: 26.1 t ADT: 26
43130 272 STR.
FairOver: WOLF CK
4.3 E CLAYTON, Hutchinson, SD
Built 1948 Load: 26.1 t ADT: 85
I029 S
FairOver: SNAKE CK
0.4 N US 18 W INTERCH, Lincoln, SD
Built 1960 Load: 26.1 t ADT: 9,890
I029 N
FairOver: SNAKE CK
0.4 N US 18 W INTERCH, Lincoln, SD
Built 1960 Load: 26.1 t ADT: 9,890
SD038 WF
FairOver: CK
AT MONTROSE, McCook, SD
Built 1959 Load: 26.1 t ADT: 572
253RD STREET
FairOver: SLIP-UP CREEK
7.1W GARRETSON, Minnehaha, SD
Built 1937 Load: 26.1 t ADT: 53
27470 453 AVE
FairOver: WEST FORK VERMILLION RV
0.2N PARKER, Turner, SD
Built 1970 Load: 26.1 t ADT: 97
SD046
FairOver: BR EAST BRULE CK
7.1 E OF BERESFORD, Union, SD
Built 1930 Load: 26.1 t ADT: 2,117
I029
FairOver: CK
0.9 S SD 30 INTERCH, Brookings, SD
Built 1970 Load: 26.2 t ADT: 9,960
401ST AVENUE
FairOver: FIRESTEEL CK
4.0W 1.5S LOOMIS, Davison, SD
Built 1981 Load: 26.2 t ADT: 40
SANBORN ST (SD37)
FairOver: BNSF RR
0.4N JCTI90 LOOP MITCHELL, Davison, SD
Built 2001 Load: 26.2 t ADT: 13,545
NEMO ROAD
FairOver: BOXELDER CK
9.8W 3.5N RAPID CITY, Pennington, SD
Built 1972 Load: 26.2 t ADT: 1,452
41120 307th Street
FairOver: Emanuel Creek
3.0S & 4.8W of Tyndall, Bon Homme, SD
Built 1975 Load: 26.3 t ADT: 107
IRR BIA RTE 44
FairOver: NORTH FORK OF OAK CREEK
5.6 KM SE OF MAHTO, Corson, SD
Built 1961 Load: 26.3 t ADT: 100
IRR US012
FairOver: BR HAY CK
6.0 E PERKINS CO LINE, Corson, SD
Built 1962 Load: 26.3 t ADT: 436
SD248
FairOver: MEDICINE CK
1.0 W JCT US 83, Lyman, SD
Built 1941 Load: 26.3 t ADT: 220
SD040
FairOver: BATTLE CK
5.8 E JCT US 16A, Pennington, SD
Built 1974 Load: 26.3 t ADT: 995
ST PATRICK ST
FairOver: RAPID CK
2.0 N & 0.7 E JCT US16B, Pennington, SD
Built 1972 Load: 26.3 t ADT: 18,140
30770 478 AVE.
FairOver: CK
1W & 6.7S ALCESTER, Union, SD
Built 1940 Load: 26.3 t ADT: 35
US014
FairOver: CK
4.3 E OF CAVOUR, Beadle, SD
Built 1965 Load: 26.4 t ADT: 1,883
IRR SD063
FairOver: WHITE RV
3.6 S I 90 INTERCH, Jackson, SD
Built 1970 Load: 26.4 t ADT: 159
SD044
FairOver: RAPID CK
10.8 SE OF FARMINGDALE, Pennington, SD
Built 1964 Load: 26.4 t ADT: 1,463
County Road 2
FairOver: Bull Creek
11.0E&4.0S of Greenwood, Charles Mix, SD
Built 1975 Load: 26.5 t ADT: 50
FOREST ROAD
FairOver: RAPID CK
0.2E 0.8S JOHNSON SD, Pennington, SD
Built 1972 Load: 26.5 t ADT: 153
RESERVOIR ROAD
FairOver: RAPID CK
.5 S HIGHWAY 44, Pennington, SD
Built 1972 Load: 26.5 t ADT: 621
I90 WF (OFFETT ST)
FairOver: BOXELDER CK
1.6 E ELK VALE RD INTERCH, Pennington, SD
Built 1953 Load: 26.5 t ADT: 6,684
119th Street
FairOver: Creek
4W of Sisseton, Roberts, SD
Built 1931 Load: 26.5 t ADT: 25
SD047
FairOver: CK
2.2 S JCT SD 44, Gregory, SD
Built 1957 Load: 26.6 t ADT: 546
SD027
FairOver: CROW CK
1.6 N JCT SD 10, Marshall, SD
Built 1960 Load: 26.6 t ADT: 667
ROCHFORD ROAD
FairOver: SOUTH FORK RAPID CK
1.0W & 0.4N ROCHFORD, Pennington, SD
Built 1992 Load: 26.6 t ADT: 129
IRR US018
FairOver: WHITE HORSE CK
3.8 W TRIPP CO LINE, Todd, SD
Built 2016 Load: 26.6 t ADT: 1,279
SD048
FairOver: DRAINAGE DITCH
0.9 W IOWA STATE LINE, Union, SD
Built 1960 Load: 26.6 t ADT: 1,134
473RD AVENUE
FairOver: CK
2E & 5.4S BROOKINGS, Brookings, SD
Built 1976 Load: 26.7 t ADT: 92
S FAIRBURN ROAD
FairOver: FRENCH CK
FAIRBURN S CITY LIMIT, Custer, SD
Built 1974 Load: 26.7 t ADT: 40
SD020
FairOver: NORTH FORK SNAKE CK
2.8 E JCT SD 45, Faulk, SD
Built 1959 Load: 26.7 t ADT: 580
IRR SD127
FairOver: BR LITTLE MINNESOTA RV
0.9 N JCT SD 10, Roberts, SD
Built 1953 Load: 26.7 t ADT: 838
SD020
FairOver: DRY RUN CK
6.8 W JCT SD 37, Spink, SD
Built 1958 Load: 26.8 t ADT: 592
SD046
FairOver: WEST BRULE CK
3.7 E OF BERESFORD, Union, SD
Built 1954 Load: 26.8 t ADT: 2,117
SD1804
FairOver: BLUE BLANKET CK
2.5 S JCT US 12, Walworth, SD
Built 1961 Load: 26.8 t ADT: 252
20th Avenue SE
FairOver: Big Sioux River
1.0S & 0.5E of Watertown, Codington, SD
Built 2010 Load: 26.9 t ADT: 3,464
DARK CANYON ROAD
FairOver: RAPID CK
1.5W 0.8S FISH HATCH, Pennington, SD
Built 1973 Load: 26.9 t ADT: 262
MAPLE AVENUE
FairOver: RAPID CK
0.1N MAPLE &OMAHA ST - RC, Pennington, SD
Built 1992 Load: 26.9 t ADT: 400
Showing 1,851-1,900 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 |