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
STATE PARK RD
FairOver: STOCKADE LK SPILLWAY
4.2E OF CUSTER, Custer, SD
Built 1988 Load: 33.6 t ADT: 50
212 5TH ST NW
FairOver: MADISON CK
212 - 5TH ST NW - MADISON, Lake, SD
Built 1972 Load: 33.6 t ADT: 257
SD011
FairOver: PIPESTONE CK
3.4 SW MINNESOTA LINE, Minnehaha, SD
Built 1963 Load: 33.6 t ADT: 2,154
US081
FairOver: BEAVER CK
4.1 N JCT SD 50, Yankton, SD
Built 1954 Load: 33.6 t ADT: 3,606
I029 S
FairOver: MEDARY CK
2.2 N MOODY CO LINE, Brookings, SD
Built 1966 Load: 33.7 t ADT: 7,880
I029 N
FairOver: MEDARY CK
2.3 N MOODY CO LINE, Brookings, SD
Built 1966 Load: 33.7 t ADT: 7,880
Kirley Road
FairOver: HERMAPHRODITE CK
0.5 N 5 E KIRLEY, Haakon, SD
Built 1990 Load: 33.7 t ADT: 44
471st Avenue
FairOver: Trib. to Saddle Creek
1W & 7.8S of Worthing, Lincoln, SD
Built 2000 Load: 33.7 t ADT: 45
ELLINGSON RD
FairOver: NORTH FORK GRAND RV
8.0W 8.0N LODGEPOLE, Perkins, SD
Built 2006 Load: 33.7 t ADT: 26
BIXBY ROAD
FairOver: THUNDER BUTTE CK
4.6 W 0.9 S BISON, Perkins, SD
Built 1963 Load: 33.7 t ADT: 172
151ST STREET
FairOver: JAMES RIVER
4.3E & 3N MELLETTE, Spink, SD
Built 1985 Load: 33.7 t ADT: 20
I029 N
FairOver: BIG SIOUX RV
AT IOWA STATE LINE, Union, SD
Built 1963 Load: 33.7 t ADT: 19,000
US012 W
FairOver: JAMES RV
11 E JCT US 281 N, Brown, SD
Built 1975 Load: 33.8 t ADT: 2,783
140th Street
FairOver: Mud Creek
2N & 2.7W of Ferney, Brown, SD
Built 1990 Load: 33.8 t ADT: 98
139th Street
FairOver: Mud Creek
3N & 2.2W of Ferney, Brown, SD
Built 1990 Load: 33.8 t ADT: 98
405th Avenue
FairOver: Mud Creek
4.1S & 1W of Groton, Brown, SD
Built 1991 Load: 33.8 t ADT: 98
254TH ST, HWY 122
FairOver: BIG SIOUX RIVER
4S & 0.3W BALTIC, Minnehaha, SD
Built 1983 Load: 33.8 t ADT: 912
258TH ST, HWY 130
FairOver: SPLIT ROCK CREEK
2N & 0.1W CORSON, Minnehaha, SD
Built 1964 Load: 33.8 t ADT: 1,102
IRR SD127
FairOver: BIG SLOUGH CK
4.7 S NORTH DAKOTA LINE, Roberts, SD
Built 1955 Load: 33.8 t ADT: 346
US014AEF
FairOver: DEADWOOD CK
0.3 E OF CENTRAL CITY, Lawrence, SD
Built 1997 Load: 33.9 t ADT: 50
SD020
FairOver: TRIB TO TIMBER CK
0.8 S JCT SD 20 W & 37, Spink, SD
Built 1955 Load: 33.9 t ADT: 878
37310 268th Street
FairOver: Platte Creek
8.0N & 6.1E of Platte, Charles Mix, SD
Built 1988 Load: 34.0 t ADT: 26
SD231 N
FairOver: RCP&E RR, DRAINAG
0.3 W JCT SD 445, Pennington, SD
Built 1971 Load: 34.0 t ADT: 7,200
145 TH AVE
FairOver: SPRING CK
5.7E, 3.2S REP. GAR., Pennington, SD
Built 1972 Load: 34.0 t ADT: 106
US083
FairOver: LITTLE CHEYENNE CK
7.8 S WALWORTH CO LINE, Potter, SD
Built 2003 Load: 34.0 t ADT: 939
SD027
FairOver: SPAIN DITCH
6.3 S JCT SD 10, Marshall, SD
Built 2007 Load: 34.1 t ADT: 727
487TH AVE, HWY 103
FairOver: SPLIT ROCK CREEK
2E & 2.4N GARRETSON, Minnehaha, SD
Built 1977 Load: 34.1 t ADT: 268
I029 N
FairOver: BACHELOR CK
3.8 S SD 34 INTERCH, Moody, SD
Built 1964 Load: 34.1 t ADT: 9,835
US014 E
FairOver: RAVINE LK
0.5 E JCT SD 37, Beadle, SD
Built 1960 Load: 34.2 t ADT: 2,520
31660 412th Avenue
FairOver: Emanuel Creek
4W & 3.6S of Tyndall, Bon Homme, SD
Built 1977 Load: 34.2 t ADT: 41
41950 311th Street
FairOver: Snatch Creek
4.5E&1.5N of Springfield, Bon Homme, SD
Built 1976 Load: 34.2 t ADT: 50
SD037
FairOver: CK
2.9 N OF VERDON, Brown, SD
Built 1955 Load: 34.2 t ADT: 1,082
US085
FairOver: INDIAN CK
16 NE JCT US 212, Butte, SD
Built 1965 Load: 34.2 t ADT: 1,062
Northwestern Ave
FairOver: MITCHELL CK
MIDLAND, Haakon, SD
Built 1965 Load: 34.2 t ADT: 45
US018
FairOver: DOG EAR CK
1.4 W OF WINNER, Tripp, SD
Built 1965 Load: 34.2 t ADT: 3,585
US085
FairOver: CROW CK
2 N OF BELLE FOURCHE, Butte, SD
Built 1966 Load: 34.3 t ADT: 1,551
US212
FairOver: DRY CK
1.5 NE OF NEWELL, Butte, SD
Built 1956 Load: 34.3 t ADT: 494
46120 315 ST.
FairOver: CLAY CK DITCH
2.5N & 2.9W VERMILLION, Clay, SD
Built 1988 Load: 34.3 t ADT: 35
US016
FairOver: FRENCH CK
0.1 E JCT US 385 S, Custer, SD
Built 1966 Load: 34.3 t ADT: 9,174
SD022
FairOver: STRAY HORSE CK
7.4 E JCT US 81, Hamlin, SD
Built 1957 Load: 34.3 t ADT: 826
SD025
FairOver: BEAVER CK
6.5 S OF SCOTLAND, Bon Homme, SD
Built 1920 Load: 34.4 t ADT: 780
US281
FairOver: FOOT CK
1.1 S JCT US 12, Brown, SD
Built 1971 Load: 34.4 t ADT: 4,049
SD045
FairOver: SMITH CK
3.1 S BUFFALO CO LINE, Brule, SD
Built 1960 Load: 34.4 t ADT: 971
US085
FairOver: EAST BR ANTELOPE CK
13.3 S HARDING CO LINE, Butte, SD
Built 1965 Load: 34.4 t ADT: 1,062
SD158
FairOver: NORTH FORK YELLOW BANK R
0.8 E JCT SD 15, Grant, SD
Built 1966 Load: 34.4 t ADT: 270
396th Avenue
FairOver: James River
0.5S of Columbia, Brown, SD
Built 1999 Load: 34.5 t ADT: 105
US085
FairOver: OWL CK
10.8 N OF BELLE FOURCHE, Butte, SD
Built 1966 Load: 34.5 t ADT: 1,551
IRR SD065
FairOver: WHITE SHIRT CK
5.3 S JCT US 12, Corson, SD
Built 1956 Load: 34.5 t ADT: 244
IRR US012
FairOver: CK
5.5 SE OF MCLAUGHLIN, Corson, SD
Built 1964 Load: 34.5 t ADT: 426
SD034
FairOver: FIRESTEEL CK
1.4 W JCT US 281, Jerauld, SD
Built 1963 Load: 34.5 t ADT: 1,179
Showing 2,301-2,350 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 |