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
I029 S
FairOver: SIX MILE CK
1.1 N US14 BY-PASS, Brookings, SD
Built 1970 Load: 35.6 t ADT: 5,620
I029 N
FairOver: SIX MILE CK
1.1 N US14 BY-PASS, Brookings, SD
Built 1970 Load: 35.6 t ADT: 5,620
US014
FairOver: CK
2.5 E HYDE CO LINE, Hand, SD
Built 1935 Load: 35.6 t ADT: 1,935
I090 E
FairOver: RC,P&E RR
0.8 W SD 34 N INTERCH, Lawrence, SD
Built 1968 Load: 35.6 t ADT: 7,465
47690 305 STR.
FairOver: CK
7S & 4.9E BERESFORD, Union, SD
Built 1989 Load: 35.6 t ADT: 15
US014
FairOver: WEST BR DEER CK
0.9 E I 29 INTERCH, Brookings, SD
Built 1973 Load: 35.7 t ADT: 4,876
283rd Street
FairOver: Big Sioux River
1.6S & 0.6E of Canton, Lincoln, SD
Built 1971 Load: 35.7 t ADT: 400
I090 W
FairOver: WILLOW CK
3 W I 29 INTERCH, Minnehaha, SD
Built 1961 Load: 35.7 t ADT: 8,550
I090 E
FairOver: WILLOW CK
3 W I 29 INTERCH, Minnehaha, SD
Built 1961 Load: 35.7 t ADT: 8,550
SD037
FairOver: CK
6 S JCT US 212, Spink, SD
Built 1956 Load: 35.8 t ADT: 585
SD028
FairOver: FOSTER CK
2.0 E JCT SD 37, Spink, SD
Built 2013 Load: 35.8 t ADT: 334
SD050
FairOver: BRULE CK
2.1 W IOWA LINE, Union, SD
Built 1960 Load: 35.8 t ADT: 1,147
SIDNEY STAGE RD.
FairOver: CK
5.3E & 10.3S STURGIS, Meade, SD
Built 1966 Load: 35.9 t ADT: 15
SD034
FairOver: BIG SIOUX RV
2.1 W JCT SD 13, Moody, SD
Built 1986 Load: 35.9 t ADT: 1,942
SD010
FairOver: LAKE POCASSE LK
1.0 E OF POLLOCK, Campbell, SD
Built 1961 Load: 36.0 t ADT: 404
I090 W
FairOver: JAMES RV, BNSF RR
AT DAVISON CO LINE, Hanson, SD
Built 1967 Load: 36.0 t ADT: 7,065
I090 E
FairOver: JAMES RV, BNSF RR
AT DAVISON CO LINE, Hanson, SD
Built 1967 Load: 36.0 t ADT: 7,065
IRR SD034
FairOver: WEST FORK ELM CK
0.9 S JCT SD 47 N, Hyde, SD
Built 1955 Load: 36.0 t ADT: 874
US183
FairOver: WHITE RV
TRIPP & LYMAN CO LINE, Lyman, SD
Built 2018 Load: 36.0 t ADT: 756
IRR BIA RTE 2
FairOver: MEDICINE ROOT CREEK
0.5 KM EAST OF KYLE, Oglala Lakota, SD
Built 1980 Load: 36.0 t ADT: 1,314
SD050 W
FairOver: JAMES RV
6.2 E JCT US 81, Yankton, SD
Built 1976 Load: 36.0 t ADT: 2,763
US014 B
FairOver: SIX MILE CK
2.0 W I 29 INTERCH, Brookings, SD
Built 1967 Load: 36.1 t ADT: 9,525
US085
FairOver: BATTLE CK
12.7 S HARDING CO LINE, Butte, SD
Built 1965 Load: 36.1 t ADT: 1,223
SD019
FairOver: VERMILLION RV
1.2 N OF SD 50 JUNCTION, Clay, SD
Built 1977 Load: 36.1 t ADT: 1,437
1232 DAWSON ROAD
FairOver: VERMILLION RV
1.3S JCT SD19 & 50, Clay, SD
Built 2000 Load: 36.1 t ADT: 80
257TH STREET
FairOver: SKUNK CK
2N & 1.3E HARTFORD, Minnehaha, SD
Built 1987 Load: 36.1 t ADT: 48
254TH ST, HWY 122
FairOver: COLTON CK
1.4S & 2.3W LYONS, Minnehaha, SD
Built 1998 Load: 36.1 t ADT: 611
MYSTIC ROAD
FairOver: CASTLE CK
0.5 S MYSTIC, Pennington, SD
Built 1980 Load: 36.1 t ADT: 128
SD049
FairOver: MOCCASIN CK
4.3 SW LYMAN CO LINE, Tripp, SD
Built 1964 Load: 36.1 t ADT: 376
IRR BIA RTE 2
FairOver: CROW CREEK
3.4 KM NW OF SHELBY, Buffalo, SD
Built 1973 Load: 36.2 t ADT: 178
US018
FairOver: DRAW
6 NE OF EDGEMONT, Fall River, SD
Built 1980 Load: 36.2 t ADT: 2,290
SD015
FairOver: NORTH FORK WHETSTONE RV
6.0 N JCT US 12, Grant, SD
Built 1957 Load: 36.2 t ADT: 1,258
260TH STREET
FairOver: SPLIT ROCK CREEK
0.4E CORSON, Minnehaha, SD
Built 1964 Load: 36.2 t ADT: 60
460 AVENUE
FairOver: WILLOW CK
5.0E 2.5N WATERTOWN, Codington, SD
Built 1973 Load: 36.3 t ADT: 336
468 AVENUE
FairOver: CK
3.3E & 4.1N MARVIN, Grant, SD
Built 2009 Load: 36.3 t ADT: 20
I090 W
FairOver: RC,P&E RR
0.8 W SD 34 N INTERCH, Lawrence, SD
Built 1968 Load: 36.3 t ADT: 7,465
SD044
FairOver: WHITE THUNDER CK
2 W OF WOOD, Mellette, SD
Built 1981 Load: 36.3 t ADT: 271
I090 E
FairOver: SPLIT ROCK CK
0.4 E SD 11 INTERCH, Minnehaha, SD
Built 2017 Load: 36.3 t ADT: 11,910
SD019A
FairOver: VERMILLION RV
5.2 E JCT SD 19, Turner, SD
Built 1968 Load: 36.3 t ADT: 320
152ND ST
FairOver: PREACHERS RUN CK
1N & 1.1W CHELSEA, Faulk, SD
Built 2016 Load: 36.4 t ADT: 36
US014
FairOver: SQUAW CK
9.3 W OF MIDLAND, Haakon, SD
Built 1994 Load: 36.4 t ADT: 725
PLAYHOUSE ROAD
FairOver: IRON CK
2.3 N. SPOKANE, Pennington, SD
Built 1977 Load: 36.4 t ADT: 487
405TH AVE.
FairOver: JAMES RV
7.4N FORESTBURG, Sanborn, SD
Built 1969 Load: 36.4 t ADT: 192
US014
FairOver: PEARL CK
2.8 E OF CAVOUR, Beadle, SD
Built 1965 Load: 36.5 t ADT: 1,883
IRR BIA RTE 202
FairOver: SMITH CREEK
0.8 KM S OF SHELBY, Buffalo, SD
Built 1983 Load: 36.5 t ADT: 147
US016A
FairOver: FRENCH CK
1.8 E JCT SD 89 N, Custer, SD
Built 1964 Load: 36.5 t ADT: 1,691
US016A
FairOver: FRENCH CK
2.0 E JCT SD 89 N, Custer, SD
Built 1964 Load: 36.5 t ADT: 1,691
SD011
FairOver: BEAVER CK
2.5 N JCT US 18, Lincoln, SD
Built 1963 Load: 36.5 t ADT: 2,938
I029 N
FairOver: SKUNK CK
0.3 N 26TH ST INTERCH, Minnehaha, SD
Built 1989 Load: 36.5 t ADT: 32,190
318 AVENUE
FairOver: WHITE RV
5.7W & 7.5N HAMILL, Tripp, SD
Built 1980 Load: 36.5 t ADT: 47
Showing 2,401-2,450 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 |