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
IRR AR SD273
FairOver: MEDICINE CK
0.2 N I 90 @ KENNEBEC, Lyman, SD
Built 1967 Load: 38.7 t ADT: 475
IRR BIA RTE 27
FairOver: WHITE RIVER
4 KM N OF ROCKYFORD, Oglala Lakota, SD
Built 1985 Load: 38.7 t ADT: 2,368
US016 W
FairOver: SPRING CK
2.3 S JCT US 16B, Pennington, SD
Built 1963 Load: 38.7 t ADT: 4,626
413th Avenue
FairOver: Shue Creek
15.3N & 5W of Iroquois, Beadle, SD
Built 2007 Load: 38.8 t ADT: 56
SD044
FairOver: SWINE HART CK
9.3 SE OF FARMINGDALE, Pennington, SD
Built 1964 Load: 38.8 t ADT: 1,463
SD073
FairOver: LAKE CK
6.3 S JCT US 18, Bennett, SD
Built 1964 Load: 38.9 t ADT: 523
OLD HILL CITY ROAD
FairOver: BATTLE CK
0.6W KEYSTONE, Pennington, SD
Built 1973 Load: 38.9 t ADT: 984
SD038
FairOver: JAMES RV
DAVISON-HANSON CO LINE, Davison, SD
Built 1988 Load: 39.0 t ADT: 2,279
SD073
FairOver: BAD RV
0.6 S JCT US 14, Haakon, SD
Built 1963 Load: 39.0 t ADT: 676
I090 EB OFF RAMP
FairOver: SPEARFISH CK
0.3 W US 85 INTERCH, Lawrence, SD
Built 1971 Load: 39.0 t ADT: 1,291
SD044
FairOver: CLEGHORN CANYON
3.6 SW JCT SD 231, Pennington, SD
Built 1967 Load: 39.0 t ADT: 5,781
US081
FairOver: MISSOURI RV
US081 NE Border, Yankton, SD
Built 2007 Load: 39.0 t ADT: 7,755
SD044
FairOver: WOLF CK
9 W JCT US 81, Hutchinson, SD
Built 1962 Load: 39.1 t ADT: 1,592
US081
FairOver: BIG SIOUX RV
0.7 S JCT US 212, Codington, SD
Built 1966 Load: 39.2 t ADT: 7,500
US018
FairOver: FALL RV
0.1 W JCT US 385, Fall River, SD
Built 1968 Load: 39.2 t ADT: 4,409
US385
FairOver: HORSEHEAD CK
5.0 S JCT US 18 E, Fall River, SD
Built 1963 Load: 39.2 t ADT: 673
IRR AR SD273
FairOver: GROUSE CK
3.1 N I 90 @ KENNEBEC, Lyman, SD
Built 1967 Load: 39.2 t ADT: 170
IRR AR US083
FairOver: HORSE HEAD CK
3.1 S JCT SD 44 E, Mellette, SD
Built 1966 Load: 39.2 t ADT: 1,558
DEERFIELD ROAD
FairOver: NEWTON FORK CK
.3W & .9N HILL CITY, Pennington, SD
Built 1987 Load: 39.2 t ADT: 1,837
DEERFIELD ROAD
FairOver: NEWTON FORK CK
.3W & .8N HILL CITY, Pennington, SD
Built 1987 Load: 39.2 t ADT: 1,837
IRR SD106
FairOver: LITTLE MINNESOTA RV
3.2 W JCT SD 127, Roberts, SD
Built 1965 Load: 39.2 t ADT: 530
W 15TH STREET
FairOver: MARNE CREEK
W 15TH STREET - YANKTON, Yankton, SD
Built 2005 Load: 39.3 t ADT: 3,820
SHERIDAN LAKE ROAD
FairOver: SPRING CK
2MI.N 3MI.W ROCKERVILLE, Pennington, SD
Built 1974 Load: 39.4 t ADT: 933
SD050
FairOver: MARNE CK
0.8 E JCT US 81, Yankton, SD
Built 1971 Load: 39.4 t ADT: 8,662
SNOMA ROAD
FairOver: REDWATER CANAL
1 MI EAST BELLE F., Butte, SD
Built 1975 Load: 39.5 t ADT: 150
SD079
FairOver: SOUTH FORK MOREAU RV
0.4 N OF HOOVER, Butte, SD
Built 1972 Load: 39.5 t ADT: 388
IRR SD065
FairOver: HUMP CK
10.6 S JCT US 12, Corson, SD
Built 1956 Load: 39.5 t ADT: 244
US018
FairOver: FALL RV
1.0 W JCT SD 79 N, Fall River, SD
Built 2010 Load: 39.5 t ADT: 4,764
174TH STREET
FairOver: CREEK
0.7S & 6.4W REDFIELD, Spink, SD
Built 1991 Load: 39.5 t ADT: 68
SD048
FairOver: CK
4.5 E I 29 INTERCH, Union, SD
Built 1956 Load: 39.5 t ADT: 742
30140 420th Avenue
FairOver: Snatch Creek
1.6N & 3E of Tyndall, Bon Homme, SD
Built 1970 Load: 39.6 t ADT: 60
I090 E
FairOver: BURLINGTON NORTHERN RR
0.5 W SD 11 INTERCH, Minnehaha, SD
Built 1960 Load: 39.6 t ADT: 15,085
IRR I029 N
FairOver: AGENCY CK
1.8 N PEEVER INTERCH, Roberts, SD
Built 1981 Load: 39.6 t ADT: 2,475
IRR I029 S
FairOver: BR HINES CK
1.4 N PEEVER INTERCH, Roberts, SD
Built 1981 Load: 39.6 t ADT: 2,475
IRR I029 N
FairOver: BR HINES CK
1.4 N PEEVER INTERCH, Roberts, SD
Built 1981 Load: 39.6 t ADT: 2,475
SD034
FairOver: RC,P&E RR
14.2 E JCT US 14 & 83, Hughes, SD
Built 1964 Load: 39.7 t ADT: 1,566
US014
FairOver: COTTONWOOD CK
5.3 E PENNINGTON CO LINE, Jackson, SD
Built 1955 Load: 39.7 t ADT: 970
Inlet Canal Road
FairOver: Crow Creek Wasteway
1.7 mi NE Belle Fourche, Butte, SD
Built 1907 Load: 39.9 t ADT: 1
I090 E
FairOver: WHITEWATER CK
6.3 NW SD 240 S INTERCH, Jackson, SD
Built 1973 Load: 39.9 t ADT: 3,875
240 ST
FairOver: EAST FORK VERMILLION RV
7.0S & 1.1W JUNIUS, Lake, SD
Built 1977 Load: 39.9 t ADT: 45
CANYON STREET
FairOver: SPEARFISH CK
CANYON ST - SPEARFISH, Lawrence, SD
Built 1992 Load: 39.9 t ADT: 1,664
SPRING CREEK ROAD
FairOver: SPRING CK
0.3S 0.5E REPTILE GD, Pennington, SD
Built 1972 Load: 39.9 t ADT: 2,048
I090 W
FairOver: RCP&E RR
1.4 W EXIT 67, Pennington, SD
Built 1963 Load: 40.0 t ADT: 9,610
I090 E
FairOver: RCP&E RR
1.4 W EXIT 67, Pennington, SD
Built 1963 Load: 40.0 t ADT: 9,610
US014 E
FairOver: WEST BR SIX MILE CK
0.2 SE JCT US 14 BY-PASS, Brookings, SD
Built 1967 Load: 40.1 t ADT: 2,109
US014 W
FairOver: WEST BR SIX MILE CK
0.2 SE JCT US 14 BY-PASS, Brookings, SD
Built 1970 Load: 40.1 t ADT: 2,109
SD028
FairOver: PEG MUNKY RUN CK
1.5 E HAMLIN CO LINE, Deuel, SD
Built 2004 Load: 40.1 t ADT: 1,303
372ND AVE
FairOver: SOUTH FORK SNAKE CK
8.4S CHELSEA, Faulk, SD
Built 1988 Load: 40.1 t ADT: 106
US014 E
FairOver: BIG SIOUX RV OVERFLOW
1.7 E OF VOLGA, Brookings, SD
Built 1978 Load: 40.2 t ADT: 4,096
IRR SD025
FairOver: UPPER LITTLE MINNESOTA R
0.3 N JCT SD 106, Roberts, SD
Built 1965 Load: 40.2 t ADT: 460
Showing 2,551-2,600 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 |