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
I090 W
UnknownOver: 303 AVE
3 W US 183 S INTERCH, Lyman, SD
Built 1970 ADT: 25
I090 E
UnknownOver: 303 AVE
3 W US 183 S INTERCH, Lyman, SD
Built 1970 ADT: 25
I090 W
UnknownOver: 305 AVE
W PRESHO INTERCHANGE, Lyman, SD
Built 1970 ADT: 50
I090 E
UnknownOver: 305 AVE
W PRESHO INTERCHANGE, Lyman, SD
Built 1970 ADT: 50
I090 W
UnknownOver: US183
US 183 INTERCHANGE, Lyman, SD
Built 1970 ADT: 621
I090 E
UnknownOver: US183
US 183 INTERCHANGE, Lyman, SD
Built 1970 ADT: 621
I090 W
UnknownOver: 308 AVE
2 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 20
I090 E
UnknownOver: 308 AVE
2 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 20
I090 W
UnknownOver: 310 AVE
4 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 50
I090 E
UnknownOver: 310 AVE
4 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 50
I090 W
UnknownOver: 312 AVE
6 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 24
I090 E
UnknownOver: 312 AVE
6 E US 183 INTERCH, Lyman, SD
Built 1970 ADT: 24
I090 W
UnknownOver: SD273
KENNEBEC INTERCHANGE, Lyman, SD
Built 1970 ADT: 1,020
I090 E
UnknownOver: SD273
KENNEBEC INTERCHANGE, Lyman, SD
Built 1970 ADT: 1,020
I090 W
UnknownOver: 319 AVE
4.3 E KENNEBEC INTERCH, Lyman, SD
Built 1971 ADT: 20
I090 E
UnknownOver: 319 AVE
4.3 E KENNEBEC INTERCH, Lyman, SD
Built 1971 ADT: 20
I090 W
UnknownOver: 321 AVE
LYMAN INTERCHANGE, Lyman, SD
Built 1971 ADT: 106
I090 E
UnknownOver: 321 AVE
LYMAN INTERCHANGE, Lyman, SD
Built 1971 ADT: 106
I090 W
UnknownOver: 324 AVE
4 W RELIANCE INTERCH, Lyman, SD
Built 1971 ADT: 75
I090 E
UnknownOver: 324 AVE
4 W RELIANCE INTERCH, Lyman, SD
Built 1971 ADT: 75
I090 W
UnknownOver: SD248
RELIANCE INTERCHANGE, Lyman, SD
Built 2006 ADT: 850
I090 E
UnknownOver: SD248
RELIANCE INTERCHANGE, Lyman, SD
Built 2006 ADT: 850
I090 W
UnknownOver: SD047
SD 47 INTERCHANGE, Lyman, SD
Built 1971 ADT: 282
I090 E
UnknownOver: SD047
SD 47 INTERCHANGE, Lyman, SD
Built 1971 ADT: 642
I090 W
UnknownOver: I90 EF
2.8 E SD 47 INTERCH, Lyman, SD
Built 1972 ADT: 2
I090 E
UnknownOver: I90 EF
2.8 E SD 47 INTERCH, Lyman, SD
Built 1972 ADT: 2
I090 W
UnknownOver: BIG CK, I90 WF
2.2 W OACOMA INTERCH, Lyman, SD
Built 1971 ADT: 50
I090 E
UnknownOver: BIG CK, I90 WF
2.2 W OACOMA INTERCH, Lyman, SD
Built 1971 ADT: 50
I090 W
UnknownOver: COOPER SCHOOL RD
1 W OACOMA INTERCH, Lyman, SD
Built 1971 ADT: 85
I090 E
UnknownOver: COOPER SCHOOL RD
1 W OACOMA INTERCH, Lyman, SD
Built 1971 ADT: 85
I090 W
UnknownOver: I090 L
OACOMA INTERCHANGE, Lyman, SD
Built 1971 ADT: 5,450
I090 E
UnknownOver: I090 L
OACOMA INTERCHANGE, Lyman, SD
Built 1971 ADT: 5,450
431 AVE (FAS 6341)
UnknownOver: I090
4.0 E SD 25 INTERCHANGE, McCook, SD
Built 1964 ADT: 10,520
435 AVE (FAS 6211)
UnknownOver: I090
6.0 W US 81 INTERCHANGE, McCook, SD
Built 1964 ADT: 10,280
438 AVE
UnknownOver: I090
3.0 W US 81 INTERCH, McCook, SD
Built 1964 ADT: 10,400
US081
UnknownOver: I090
US 81 INTERCHANGE, McCook, SD
Built 1993 ADT: 10,490
I090 W
UnknownOver: 448 AVE
2 E US 81 INTERCH, McCook, SD
Built 1964 ADT: 45
I090 E
UnknownOver: 448 AVE
2 E US 81 INTERCH, McCook, SD
Built 1964 ADT: 45
445 AVE (FAS 6355)
UnknownOver: I090
4 E US 81 INTERCHANGE, McCook, SD
Built 1964 ADT: 10,490
447 AVE
UnknownOver: I090
6 E US 81 INTERCH, McCook, SD
Built 1964 ADT: 10,410
451 AVE (FAS 6149)
UnknownOver: I090
MONTROSE INTERCHANGE, McCook, SD
Built 1964 ADT: 10,410
I090 W
UnknownOver: 453 AVE
1 W MINNEHAHA CO LINE, McCook, SD
Built 1964 ADT: 45
I090 E
UnknownOver: 453 AVE
1 W MINNEHAHA CO LINE, McCook, SD
Built 1964 ADT: 45
I090 W
UnknownOver: US014A
EXIT 30 US14A/SD34 INTERC, Meade, SD
Built 1963 ADT: 10,609
I090 E
UnknownOver: US014A
EXIT 30 US14A INTERCHANGE, Meade, SD
Built 1963 ADT: 10,609
RCP&E RR
UnknownOver: SHERMAN STREET
SHERMAN ST, Meade, SD
Built 1914 ADT: 1,539
I090 W
UnknownOver: DOLAN CK RD (FAS)
0.9 NW STURGIS INTERCH, Meade, SD
Built 1963 ADT: 1,250
I090 E
UnknownOver: DOLAN CK RD (FAS)
0.9 NW STURGIS INTERCH, Meade, SD
Built 1963 ADT: 1,250
RCP&E RR
UnknownOver: FIFTH STREET
FIFTH ST, Meade, SD
Built 1989 ADT: 2,000
I090 W
UnknownOver: VANOCKER CANY, RCP&E RR
0.1 NW STRGS INTERCHANGE, Meade, SD
Built 2005 ADT: 7,729
Showing 201-250 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 |